icnd220sg
DESCRIPTION
CCNA 220TRANSCRIPT
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Line: Serial Line: Ethernet
Home Office
Wireless Connectivity
CSU/DSU Modem
Router Switch
Adaptive Security
Appliance
Wireless Router Layer 3 Switch
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Cisco Certified Network Associate
Recommended Training Through
Cisco Learning Partners� Interconnecting Cisco Networking Devices
Part 1� Interconnecting Cisco Networking Devices
Part 2
Cisco Certified Entry Network
Technician
Recommended Training Through
Cisco Learning Partners
� Interconnecting Cisco Networking Devices Part 1
Entry Technician
Professional
Associate
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VLAN 3
HR
10.0.3.0/24
Third
Floor
Second
Floor
First
Floor
VLAN 2
IT
10.0.2.0/24
VLAN 4
Sales
10.0.4.0/24
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Green VLAN
Red VLAN
Blue VLAN
Green VLAN
Red VLAN
Blue VLAN
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Is port in
correct
VLAN?
Is VLAN
present in
VLAN
database?
No connection
among PCs in
same VLAN
Successful
connection among
PCs in same VLAN
Yes
Assign port to
correct VLAN
Create VLAN in
VLAN database
No No
show vlan
show mac address-table
Yes
show vlan
show interfaces
show interfaces switchport
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Operational trunkYes
Change native
VLAN to match.
Statically configure ports
on both devices to trunk.
No No
show interfaces trunk
Yes
show interfaces trunk
Local and
peer native
VLAN
match?
Local and
peer trunk
modes
match?
Troubleshoot
trunks
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Loop
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No
Loop
X
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Bridge Priority MAC Address
Range: 0–65535
Default: 32768
Unique for every device
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Switch APriority: 28672
MAC: 0000.0cab.3274
Switch CPriority: 32768
MAC: 0000.0cf6.9370
Switch DPriority: 32768MAC: 0000.0c39.f28a
Switch BPriority: 28672MAC: 0000.0c9f.3127Root Bridge
1 G
b/s
1 G
b/s
10 Gb/s
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Switch APriority: 28672
MAC: 0000.0cab.3274
Switch CPriority: 32768
MAC: 0000.0cf6.9370
Switch DPriority: 32768MAC: 0000.0c39.f28a
Switch BPriority: 28672MAC: 0000.0c9f.3127Root Bridge
Co
st 4
Co
st 4
RPRP
DP DP
RP Cost 2
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Switch APriority: 28672
MAC: 0000.0cab.3274
Switch CPriority: 32768
MAC: 0000.0cf6.9370
Switch DPriority: 32768MAC: 0000.0c39.f28a
Switch BPriority: 28672MAC: 0000.0c9f.3127Root Bridge
Co
st 4
Co
st 4
RPRP
DP DP DP DP
DPRP Cost 2
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Switch APriority: 28672
MAC: 0000.0cab.3274
Switch CPriority: 32768
MAC: 0000.0cf6.9370
Switch DPriority: 32768MAC: 0000.0c39.f28a
Switch BPriority: 28672MAC: 0000.0c9f.3127Root Bridge
Co
st 4
Co
st 4
FF
F F F F
FF Cost 2
BBBX
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Root for VLAN 1 Root for VLAN 2
Forwarding Port for VLAN 2Forwarding Port for VLAN 1
Blocking Port for VLAN 1Blocking Port for VLAN 2
PC in VLAN 1
PC in VLAN 2
PC in VLAN 1
PC in VLAN 2
PC in VLAN 1 PC in VLAN 2
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MAC Address
Bridge ID = 8 Bytes
4 Bits 12 Bits 48 Bits
ExtendSystem ID
BridgePriority
BridgePriority
MAC Address
Bridge ID = 8 Bytes
2 Bytes 6 Bytes
Bridge ID Without the
Extended System ID
Extended Bridge ID
with System ID = VLAN
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Discover
physical
Layer 2
topology
Prepare
expected
Layer 2
path
Analyze STP
show cdp neighbors
Use STP knowledge
Verify
root
bridge
show spanning-tree vlan
Confirm
Layer 2
path
show spanning-tree vlan
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Switch A
Switch C Switch D
Switch BRoot Bridge
FF
F F F F
FF
VLAN 100
BBBX
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Switch APriority: 28672
MAC: 0000.0cab.3274
Switch CPriority: 32768
MAC: 0000.0cf6.9370
Switch DPriority: 32768MAC: 0000.0c39.f28a
Switch BPriority: 28672MAC: 0000.0c9f.3127Root Bridge
Co
st 4
Co
st 4
FF
F F F F
FF Cost 2
BBBX
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Switch A
Switch C Switch D
Switch BRoot Bridge
FF
F F F F
FF
VLAN 100
FBBX
Switch A
Switch C Switch D
Switch BRoot Bridge
F
F F F F
FF
VLAN 100
FBBX
F
Frame enters here
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PortFast
Access Port
PortFast
Access Port
TrunkTrunk
TrunkSwitch X
Switch Z
Switch Y
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X
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EtherChannel
EtherChannel EtherChannel
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PAgP
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LACP
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LACP
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Fa0/1
Fa0/2
Fa0/4
Fa0/5SW1 SW2
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No Default GatewayI cannot reach my default gateway.
Router B
10.1.10.3
0014.a866.2898
Router A
10.1.10.2
0014.a855.1788
Server
10.9.1.50
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Forwarding
Router
Standby
Router
Virtual Router
Core
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Forwarding Router
StandbyRouter
Virtual Router
Link or device
failure: Standby
router becomes
virtual router.
Core
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HSRP Group 1
Active StandbyVirtual
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Internet
HSRP Group 1
Active StandbyVirtual
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Core Core
Tracked Interfaces
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Root VLAN 20
HSRP Active Group 20
Root VLAN 10
HSRP Active Group 10
VLAN 10VLAN 20
Uplink VLAN 20Uplink VLAN 10
Core
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Internet
GLBP Group 1
VirtualForwarding Forwarding
1. 2. 3. 4.
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Server
PC1 SW1
Branch
HQ
Desirable path betweenPC1 and Server
10.1.10.1
192.168.1.2192.168.1.1 172.16.1.100
10.1.10.100
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End-to-end connectivity is operational.
No
Yes
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Solve the physical connectivity issue.
Solve the path selection issue.
Correct the default gateway.
Correct the name resolution entry.
Correct the ACL.
Is end-to-endconnectivity operational?
Start troubleshooting.
Is there a physicalconnectivity issue?
Is the current pathundesired?
Is the default gatewayincorrect?
Is the name resolution entryincorrect?
Is the ACL blocking traffic?
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End-to-end connectivity is operational.
No
Yes
Is there a physicalconnectivity issue?
Is the current pathundesired?
Is the default gatewayincorrect?
Is the name resolution entryincorrect?
Is the ACL blocking traffic?
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Start troubleshooting.
Solve the physical connectivity issue.
Solve the path selection issue.
Correct the default gateway.
Correct the name resolution entry.
Correct the ACL.
Is end-to-end
connectivity operational?
Server
PC1 SW1
Branch
HQ10.1.10.1
192.168.1.2192.168.1.1 172.16.1.100
10.1.10.100
Verify connectivityand path selectionto the Server.
Verify connectivity and pathselection to the Server.
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Is end-to-endconnectivity operational?
End-to-end connectivity is operational.
No
Yes
Is the current pathundesired?
Is the default gatewayincorrect?
Is the name resolution entryincorrect?
Is the ACL blocking traffic?
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Start troubleshooting.
Solve the physical connectivity issue.
Solve the path selection issue.
Correct the default gateway.
Correct the name resolution entry.
Correct the ACL.
Is there a physical
connectivity issue?
![Page 105: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/105.jpg)
Server
PC1SW1
Branch
HQ
Gi0/1
Verify drops and errors on physical interface.
![Page 106: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/106.jpg)
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Is end-to-endconnectivity operational?
End-to-end connectivity is operational.
No
Yes
Is there a physicalconnectivity issue?
Is the default gatewayincorrect?
Is the name resolution entryincorrect?
Is the ACL blocking traffic?
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Start troubleshooting.
Solve the physical connectivity issue.
Solve the path selection issue.
Correct the default gateway.
Correct the name resolution entry.
Correct the ACL.
Is the current path
undesired?
Server
PC1 SW1
Branch
HQ
Verify path selection in the routing table.
10.1.10.1
192.168.1.2192.168.1.1 172.16.1.100
10.1.10.100
![Page 110: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/110.jpg)
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End-to-end connectivity is operational.
No
Yes
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Solve the physical connectivity issue.
Solve the path selection issue.
Correct the default gateway.
Correct the name resolution entry.
Correct the ACL.
Is end-to-endconnectivity operational?
Start troubleshooting.
Is the name resolution entryincorrect?
Is the ACL blocking traffic?
Is there a physicalconnectivity issue?
Is the current pathundesired?
Is the default gateway
incorrect?
Server
PC1 SW1
Branch
HQ
Verify default gateway on the router.
10.1.10.1
192.168.1.2192.168.1.1 172.16.1.100
10.1.10.100
Verify default gateway on the PC.
![Page 113: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/113.jpg)
Server
PC1 SW1
Branch
HQ
Verify default gateway on the router.
10.1.10.1
192.168.1.2192.168.1.1 172.16.1.100
10.1.10.100
Verify default gateway on the PC.
![Page 114: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/114.jpg)
Is end-to-endconnectivity operational?
End-to-end connectivity is operational.
No
Yes
Is there a physicalconnectivity issue?
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Start troubleshooting.
Solve the physical connectivity issue.
Solve the path selection issue.
Correct the default gateway.
Correct the name resolution entry.
Correct the ACL.
Is the current pathundesired?
Is the default gatewayincorrect?
Is the ACL blocking traffic?
Is the name resolution entry
incorrect?
![Page 115: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/115.jpg)
Server
PC1 SW1
Branch
HQ10.1.10.1
192.168.1.2192.168.1.1 172.16.1.100
10.1.10.100
Enter static name resolution mapping for the Server.
Server
PC1 SW1
Branch
HQ10.1.10.1
192.168.1.2192.168.1.1 172.16.1.100
10.1.10.100
Use name resolution mapping with ping
command.
![Page 116: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/116.jpg)
![Page 117: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/117.jpg)
Is the name resolution entryincorrect?
Is the ACL blocking traffic?
Is the default gatewayincorrect?
Is the current pathundesired?
Is there a physicalconnectivity issue?
Is end-to-endconnectivity operational?
End-to-end connectivity is operational.
No
Yes
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Start troubleshooting.
Solve the physical connectivity issue.
Solve the path selection issue.
Correct the default gateway.
Correct the name resolution entry.
Correct the ACL.
Server
PC1 SW1
Branch
HQ10.1.10.1
Gi 0/1 172.16.1.100
10.1.10.100
Investigate the ACLs applied on the router.
![Page 118: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/118.jpg)
Server
PC1 SW1
Branch
HQ10.1.10.1
Gi 0/1 172.16.1.100
10.1.10.100
PC is unable to use Telnet to connect to the Server. Is there an ACL on the Gi 0/1?
Server
PC1 SW1
Branch
HQ10.1.10.1
Gi 0/1 172.16.1.100
10.1.10.100
Correct the ACL so that the router will permit Telnet traffic.
![Page 119: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/119.jpg)
Server
PC1 SW1
Branch
HQ10.1.10.1
Gi 0/1 172.16.1.100
10.1.10.100
Router permits Telnet traffic.
PC1 is able to use Telnet to connect to the Server.
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2001 0DB8 Interface ID
/23 /32 /48 /64
Registry
ISP Prefix
Site Prefix
Subnet Prefix
![Page 123: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/123.jpg)
Interface ID0
1111 1110 10
FE80::/10
128 Bits
64 Bits
10 Bits
![Page 124: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/124.jpg)
MAC Address
64-Bit Version
U/L Bit
EUI-64 Address
000000X0
02
00 90 27
00 90 27
90 27
17 FC 0F
17 FC 0F
FF FE
where X =1 = Universally Unique
0 = Locally UniqueX = 1
00 90 27
17 FC 0F
17 FC 0FFF FE
FF FE
![Page 125: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/125.jpg)
Server
PC1 SW1
Branch
HQ10.1.10.1
2001:db8:101:1::100
Desirable path between PC1 and Server.
2001:db8:172:16::100
![Page 126: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/126.jpg)
End-to-end connectivity is operational.
No
Yes
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Solve the physical connectivity issue.
Solve the path selection issue.
Correct the default gateway.
Correct the name resolution entry.
Correct the ACL.
Is end-to-endconnectivity operational?
Start troubleshooting.
Is there a physicalconnectivity issue?
Is the current pathundesired?
Is the default gatewayincorrect?
Is the name resolution entryincorrect?
Is the ACL blocking traffic?
![Page 127: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/127.jpg)
Server
PC1 SW1
Branch
HQ
2001:db8:101:1::100
2001:db8:172:16::100
Verify connectivityand path selectionto the Server.
Verify connectivity and pathselection to the Server .
![Page 128: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/128.jpg)
Server
PC1 SW1
Branch
HQ
2001:db8:101:1::100
2001:db8:172:16::100
Verify connectivityand path selectionto the Server.
Verify connectivity and pathselection to the Server .
![Page 129: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/129.jpg)
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Server
PC1 SW1
Branch
HQ
2001:db8:101:1::100
Verify that the current IPv6 path matches the desired path to the Server.
2001:db8:172:16::100
2001:db8::209:165::1 2001:db8::209:165::2
![Page 133: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/133.jpg)
Server
PC1 SW1
Branch
HQ
2001:db8:101:1::100
Verify that IPv6default gateway is set.
2001:db8:172:16::100
2001:db8::209:165::1 2001:db8::209:165::2
fe80::fa66:f2ff:fe31:7250
![Page 134: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/134.jpg)
Server
PC1 SW1
Branch
HQ
2001:db8:101:1::100
Enter IPv6 static name resolution mapping for the Server.
2001:db8:172:16::100
2001:db8::209:165::1 2001:db8::209:165::2
![Page 135: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/135.jpg)
Server
PC1 SW1
Branch
HQ
2001:db8:101:1::100
Use name resolution mapping with ping
command.
2001:db8:172:16::100
2001:db8::209:165::1 2001:db8::209:165::2
![Page 136: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/136.jpg)
Server
PC1 SW1
Branch
HQ
2001:db8:101:1::100
Telnet to Server is not working—investigate ACLs applied on the router.
2001:db8:172:16::100
Gi 0/1
Server
PC1 SW1
Branch
HQ
2001:db8:101:1::100
PC is not able to telnet to the Server. Is there an ACL on the Gi 0/1?
2001:db8:172:16::100
Gi 0/1
![Page 137: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/137.jpg)
Server
PC1 SW1
Branch
HQ
2001:db8:101:1::100
Correct the ACL so that the router will permit Telnet traffic.
2001:db8:172:16::100
Gi 0/1
Server
PC1 SW1
Branch
HQ
2001:db8:101:1::100
PC1 is able to use Telnet to connect to the Server.
2001:db8:172:16::100
Gi 0/1
Router permits Telnet traffic.
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EIGRP (AD=90)
OSPF (AD=110)
A B
I need to send a packet from network A to network B. Which route is the best?
![Page 152: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/152.jpg)
Core
10.1.1.0
10.1.2.0
10.1.4.0
10.1.3.0
10.3.1.0
10.3.3.0
10.3.2.0
10.3.4.0
10.2.1.0
10.2.2.0
10.2.3.0
10.1.0.0 /16 10.3.0.0 /16
10.2.0.0 /16
![Page 153: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/153.jpg)
![Page 154: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/154.jpg)
10.1.1.0/24
Metric 1000 Metric 1000
Network
Protocol
Destination
NetworkMetric
EIGRP 10.1.1.0/24 2000
Metric to reach network 10.1.1.0/24 is 1000.
Metric to destination = Reported
distance + metric to neighbor
Advertised distance
= Reported distance
![Page 155: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/155.jpg)
10.1.1.0/24
Metric 1000
Gi0/1
Network MetricAdvertised
Distance
EIGRP
Neighbor
10.1.1.0/24 2000 1000 Router A
10.1.1.0/24 2500 1500 Router B
EIGRP Neighbor Table
4
Gi0/0
B
A C
Metric 1500
Metric 1000
Metric 1000
Next-Hop Router Interface
Router A Gi0/0
Router B Gi0/1EIGRP Topology Table
Routing Table Network MetricOutbound
InterfaceNext-Hop
10.1.1.0/24 2000 Gi0/0 Router A
Successor
Feasible Successor
![Page 156: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/156.jpg)
10.1.1.0/24
• Advertised_BW [kb]
• Advertised_delay [tens of microseconds]
• Link_BW
• Link_delay
Metric = (BW+delay)*256
BW = 107/min(Advertised_BW, Link_BW)
delay = sum(Advertised_delay, Link_delay)
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S0/0/0
192.168.1.1S0/0/0
192.168.1.2
10.1.1.0/24 172.16.1.10/24
HQBranch
Configure EIGRP Configure EIGRP
![Page 159: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/159.jpg)
![Page 160: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/160.jpg)
S0/0/0
192.168.1.1S0/0/0
192.168.1.2
10.1.1.0/24 172.16.1.10/24
HQBranch
Verify EIGRP Neighbors
S0/0/0
192.168.1.1S0/0/0
192.168.1.2
10.1.1.0/24 172.16.1.10/24
HQBranch
Verify EIGRP Neighbors
![Page 161: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/161.jpg)
S0/0/0
192.168.1.1S0/0/0
192.168.1.2
10.1.1.0/24 172.16.1.10/24
HQBranch
Verify EIGRP Interfaces
![Page 162: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/162.jpg)
S0/0/0
192.168.1.1S0/0/0
192.168.1.2
10.1.1.0/24 172.16.1.10/24
HQBranch
Verify EIGRP Routes
![Page 163: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/163.jpg)
S0/0/0
192.168.1.1S0/0/0
192.168.1.2
10.1.1.0/24 172.16.1.10/24
HQBranch
Verify EIGRP Topology
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![Page 165: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/165.jpg)
Metric 100
Metric 25
Unequal-Cost
Load balancing
Metric 100
Metric 100
Equal-Cost
Load balancing
Metric 100
![Page 166: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/166.jpg)
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Does theneighbor
table hold all of thedevices that you
expect?
Does therouting table
have all of thenecessary
routes?
Connectivity issues
Functionalnetwork
• Are interfacesoperational?
• Does the EIGRP ASmatch?
• Are the interfacesenabled for EIGRP?
• Is there an interface that is configured as passive?
Down
Yes
show ip route
show ip protocols
show access-list
show ip eigrp neighbors
show ip interfaces brief
show ip eigrp interfaces
show ip protocols
• Are the networks being advertised?
• Is there an ACL blocking advertisments?
• Is there a discontiguous network issue?
Yes
NoNo
![Page 169: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/169.jpg)
10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2Branch HQ
HQ is not my EIGRP neighbor.
Is Serial0/0/0 operational?
10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2Branch HQ
HQ is not my EIGRP neighbor.
Is Serial0/0/0 operational?
![Page 170: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/170.jpg)
10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2Branch HQ
HQ is not my EIGRP neighbor.
Is there an EIGRP AS mismatch?
![Page 171: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/171.jpg)
10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2Branch HQ
HQ is not my EIGRP neighbor. Are serial interfaces on the link enabled for EIGRP?
10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2Branch HQ
HQ is not my EIGRP neighbor. Are serial interfaces on the link enabled for EIGRP?
![Page 172: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/172.jpg)
10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2Branch HQ
HQ is not my EIGRP neighbor. Is there an
interface that is configured as passive?
![Page 173: ICND220SG](https://reader033.vdocuments.net/reader033/viewer/2022052603/55cf9a10550346d033a04fa4/html5/thumbnails/173.jpg)
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10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2Branch HQ
I cannot reach network 172.16.1.0/24.
Are all networks being advertised?
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10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2Branch HQ
I cannot reach network 172.16.1.0/24. Is there an
ACL that is blocking EIGRP advertisements?
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10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2Branch HQ
I cannot reach network 172.16.1.0/24. Is there an
ACL that is blocking EIGRP advertisements?
172.16.1.0
255.255.255.0
172.16.2.0
255.255.255.0
EIGRP will advertisenetwork 172.16.0.0.
EIGRP will advertisenetwork 172.16.0.0.
A B C
10.1.1.0
255.255.255.0
10.2.2.0
255.255.255.0
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IPv6 EIGRP AS 1
Branch HQ
2001:DB8:AC10:100::1/642001:DB8:D1A5:C900::1/64
2001:DB8:D1A5:C900::2/64
Gi0/1
Gi0/1
Gi0/0
IPv6 EIGRP AS 1
Branch HQ
2001:DB8:AC10:100::1/642001:DB8:D1A5:C900::1/64
2001:DB8:D1A5:C900::2/64
Gi0/1
Gi0/1
Gi0/0
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LSAs LSAs
LSAs LSAs
X
A: Neighbors Table
B
D
A: Topology Table
Router A Network
2 transit networks
Router D Network
2 transit networks
…
A: Routing Table
Network X � D
…
LSA
Flooding
Dijkstra
SPF
A C
B
D
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10 20
10 10
X
Cost = 30
Cost = 20
A C
B
D
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Hello
Router ID
Hello/dead interval *
Neighbors
Area ID *
Router priority
DR IP address
BDR IP address
Authentication data *
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DBD DBD
LSAck LSAck
Here is my LSDB summary.
Thanks!
LSU
I need the entry for 172.16.1.0/24.
172.16.1.0/24
LSU
Here is the entry for 172.16.1.0/24.
LSAck
Thanks!
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Area 0
Area 1 Area 2
External ASR1R4
R3R2
R5 R6
OSPF Autonomous
System
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Area 0
Area 1 Area 2
External ASR1ASBR
ABRABR
R5 R6
OSPF Autonomous
System
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Area 1 Area 0 (Backbone)
Type 3
Type 5
Type 4
R1R2Type 1 or 2
R3
External
Routing Domain Type 1 or 2
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Area 0
Area 1 Area 2
External ASR1ASBR
ABRABR
R5 R6
OSPF Autonomous
System
Single-area configuration
Single-area configuration
Single-area configuration
Multiarea configuration
Multiarea configuration
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Area 0 Area 1
R1 R3 R2
Gi0/0
Gi0/0
Gi0/1
Gi0/1 10.64.0.1
10.64.0.2
10.2.1.2
10.2.1.1
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Area 0 Area 1
R1 R3 R2
Gi0/0
Gi0/0
Gi0/1
Gi0/1 10.64.0.1
10.64.0.2
10.2.1.2
10.2.1.1
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172.16.1.0/24
Hello
Down state
INIT state
Hello
Two-way state
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Here is my LSDB summary.
172.16.1.0/24zExstart state
Exchange state
DBD DBD
LSAck LSAck
Thanks!
LSU
I need the entry for 172.16.1.0/24.
LSU
Here is the entry for 172.16.1.0/24.
LSAck
Thanks!
Loading state
Full state
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Connectivity issues aredue to missingOSPF routes.
Does theneighbor
table hold all of thedevices that you
expect?
• Are the interfaces operational?
• Are the interfaces enabled for OSPF?
• Does the OSPF area match?
• Is there an interface that is configured as passive?
Yes
Does therouting table
have all of thenecessary
routes?
• Are the networksbeing advertised?
• Is there a routingsource with a lowerAD?
• Are all areas connected to Area 0?
Yes
NoNo
Yes Does the traffictake the desired
path?
• Verify the OSPF cost on an interface.
• Verify the OSPF reference bandwidth.
No
Functionallink.
show ip route
show ip protocols
show ip ospf neighbors show ip route
show ip ospf
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10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2
Branch HQ
OSPF Area 0OSPF Area 1
HQ is not my OSPF neighbor.
Are my interfaces Layer 2 operational?
10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2
Branch HQ
OSPF Area 0OSPF Area 1
HQ is not my OSPF neighbor.
Are my interfaces Layer 3 operational?
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10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2
Branch HQ
OSPF Area 0OSPF Area 1
HQ is not my OSPF neighbor.
Are my interfaces enabled for OSPF?
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10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2
Branch HQ
OSPF Area 0OSPF Area 1
Branch is not my OSPF neighbor.
Are my interfaces enabled for OSPF?
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10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2Branch HQ
OSPF Area 0OSPF Area 1
HQ is not my OSPF neighbor.
Does the OSPF area match?
10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2
HQ
OSPF Area 0OSPF Area 1
Branch is not my OSPF neighbor.
Does the OSPF area match?
Branch
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10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2
HQ
OSPF Area 0OSPF Area 1
HQ is not my OSPF neighbor.
Is the interface configured as passive?
Branch
10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2
HQ
OSPF Area 0OSPF Area 1
Branch is not my OSPF neighbor.
Is the interface configured as passive?
Branch
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10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2
HQ
OSPF Area 0OSPF Area 1
I cannot reach network
172.16.1.0/24. Is HQ advertising it?
Branch
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10.1.1.0/24 172.16.1.0/24
S0/0/0
S0/0/0192.168.1.1
192.168.1.2
HQ
OSPF Area 0OSPF Area 1
I can reach network 172.16.1.0/24, but I see no OSPF routes.
Is there another routing protocol configured?
Branch
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10.1.1.0/24 172.16.1.0/24S0/0/0
S0/0/0192.168.1.1192.168.1.2Branch HQ
Gi0/1 Gi0/1
209.165.201.1 209.165.201.2
OSPF Area 0
OSPF Area 1
The traffic is traversing both the high-speed
Ethernet link and the slow WAN link.
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OSPFv3
Area 0.0.0.1
OSPFv3 Area 0.0.0.0
InternetBranch HQ
2001:DB8:AC10:100::64/642001:DB8:D1A5:C900::1/64
2001:DB8:D1A5:C900::2/64
Gi0/1
Gi0/1
Lo0
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OSPFv3Area 1
OSPFv3 Area 0
Branch HQ
Gi0/1 Gi0/1
Lo0
1.1.1.1 2.2.2.2OSPF router-id
Link-local IPv6 address
FE80::21E:7AFF:FEA3:5E71
Link-local IPv6 address
FE80::21E:7AFF:FEA3:5F31
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OSPFv3Area 1
OSPFv3 Area 0
Branch HQ
Gi0/1 Gi0/1
Lo0
1.1.1.1 2.2.2.2OSPF router-id
Link-local IPv6 address
FE80::21E:7AFF:FEA3:5E71
Link-local IPv6 address
FE80::21E:7AFF:FEA3:5F31
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LAN
Workgroups
BranchOffice
Telecommuter
RemoteUser
CampusBackbone
WAN Access
BuildingBackbone
WAN
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Home Offices
Mobile Worker
Branch
Main Office
Remote OfficeRegional Office
Business Partners
WANInternet
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Core Routers
WAN
Switch
WAN
CSU/DSUCSU/DSU
WAN
Switch
DSL
Modem
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Optical Converter
CSU/DSU
Internet
Serial Cable Telephone or
Coaxial Cable
DTE DCE
InternetFiber
Ethernet Cable
DSL Modem
Internet
Telephone
Cable
Ethernet Cable
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DTEDCE
V.35
EIA/TIA-232
Smart Serial
Interface
Connector
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Leased Line
(PPP and HDLC)
Packet Switching
(Frame Relay and ATM)
Circuit Switching
(PPP and HDLC)
Ethernet
Broadband
(DSL, PPPoE, and PPPoA)
Service
Provider
Service
Provider
Service
Provider
Service
Provider
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Dedicated Switched Internet
LeasedLines
Circuit-Switched
Packet-Switched
BroadbandVPN
DSL CableBroadbandWireless
T1/E1 PSTNISDN
Frame Relayx.25ATM
WAN
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Internet
Telephone
Line
Telephone
Line
ISDN
ADSL
Coaxial
Cable
Cable
WirelessT3 Leased
Line
Fiber Cable
Satellite
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New York Office London Office CSU/DSUDSU/CSU
Service Provider Network
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Serial 0/0/0
DCE
Router A Router B
Serial 0/0/0
DTE
Serial 0/0/0
DCE
Router A Router B
Serial 0/0/0
DTE
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HDLC
HDLC
Flag Address Control Data FCS Flag
Cisco HDLC
Flag Address Control Proprietary Data FCS Flag
CSU/DSU DSU/CSU
FCS = Frame Check Sequence
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PPP
PPP
Flag Address Control Protocol Data FCS Flag
DSU/CSU CSU/DSU
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Network Control Protocol
Authentication, Other Options,
Link Control Protocol
Synchronous or Asynchronous
Physical Media
IPCP
IPv4
IPv6CP
IPv6 Layer 3 Protocols
Other
PPP
Network Layer
Data Link Layer
Physical Layer
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Serial 0/0/0
DCE
Router A Router B
Serial 0/0/0
DTE
Serial 0/0/0
DCE
Router A Router B
Serial 0/0/0
DTE
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Branch HQ
Username: Branch
Password: C1sco123
Username Branch password C1sco123
Accept or Reject
Username HQ password C1sco123
Username: HQ
Password: C1sco123
Accept or Reject
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Branch HQ
ChallengeUsername Branch password C1sco123
Response
Username HQ password C1sco123
Accept or Reject
Challenge
Response
Accept or Reject
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Verify whoyou are
Router to Be Authenticated
PPP encapsulation
Hostname
Username and password
PPP authentication
Authenticating Router
PPP encapsulation
Hostname
Username and password
PPP authentication
Enabling PPP
Enabling PPP Authentication
Enabling PPP
Enabling PPP Authentication
ServiceProvider
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Serial 0/0/0
DCE
Router A Router B
Serial 0/0/0
DTE
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Serial 0/0/0
DCE
Router A Router B
Serial 0/0/0
DTE
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Connectivity issues aredue to a PPP encapsulationproblem.
Functionallink.
Isencapsulationthe same onboth sides?
Are both sides of the link configured on both sides (PPP or HDLC).
Yes Is PPP CHAPworking?
• Is PPP CHAP enabled on both sides?
• Does the hostname on one side match the username on the other side?
• Are the passwords that are used for CHAP authentication the same?
Yes
NoNo
YesIs there
connectivitybetweendevices?
Verify that the IP address and mask are configured on both interfaces.
No
show interfaces debug ppp authentication
Is the correctcable type
connected?
Check if the correct cable end is connected (DTE/DCE).
No
show controllers ping
Yes
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DCEDTE
Frame Relay
Switch
You are implementing
WAN here.
WAN
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LocalAccess
Loop = T1
Local AccessLoop = 64 kb/s
Local AccessLoop = 64 kb/s
DLCI: 400
PVC
DLCI: 500
DLCI: 200
DLCI: 100Router A
Router B
PVC
LMI
100 = Active
400 = Active
Router C
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B: Full-Mesh
A: Partial-Mesh C: Star (Hub-and-Spoke)
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S0/0/0
10.1.1.1/24
10.1.1.2/24
10.1.1.3/24
10.1.1.4/24
X
EIGRP Routing
Update
Frame Relay NBMA
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S0/0/010.1.1.2/30
10.1.1.6/30
10.1.1.10/30
Frame Relay NBMA
10.1.1.1/30S0/0/0.1
S0/0/0.2
S0/0/0.3
10.1.1.5/30
10.1.1.9/30
Physical
Interface:
Logical
Interfaces:
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LMI
500 = Active
400 = Inactive
DLCI: 500
DLCI: 400 PVC
PVC 10.1.1.1
10.1.2.1
X
Keepalive
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DLCI: 500 PVC 10.1.1.1
10.1.2.1
Inverse ARP orFrame Relay Map
Frame Relay
DLCI (500) IP (10.1.1.1)
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Hello, I am 172.168.5.5.
Local DLCI 100 = Active Local DLCI 400 = Active
2Status Inquiry Status Inquiry
Frame Relay
CloudDLCI = 100 DLCI = 400
172.168.5.5 172.168.5.7
1
2 2
4
3 3
Hello, I am 172.168.5.7.4
172.168.5.5 172.168.5.7
Hello, I am 172.168.5.5.
2Keepalives Keepalives
7 7
6
5Frame Relay Map
172.168.5.7 DLCI 100 Active
5Frame Relay Map
172.168.5.5 DLCI 400 Active
Frame Relay
CloudDLCI = 100 DLCI = 400
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WANHQ
BranchDLCI=100
10.1.1.1/24 DLCI=200
10.1.1.2/24
This router uses
Inverse ARP.
This router uses
a static map.
WANHQ
BranchDLCI=100
10.1.1.1/24 DLCI=200
10.1.1.2/24
This router uses
Inverse ARP.
This router uses
a static map.
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WAN
BR1S0/0/0.110
10.1.1.1/30S0/0/0.110
10.1.1.2/30
BR2S0/0/0.210
10.1.1.6/30
S0/0/0.120
10.1.1.5/30
DLCI = 110
DLCI = 120SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
HQ
DLCI = 210
DLCI = 110
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WAN
BR1S0/0/0.110
10.1.1.1/30S0/0/0.110
10.1.1.2/30
BR2S0/0/0.210
10.1.1.6/30
S0/0/0.120
10.1.1.5/30
DLCI = 110
DLCI = 120SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
HQ
DLCI = 210
DLCI = 110
WAN
BR1S0/0/0.110
10.1.1.1/30S0/0/0.110
10.1.1.2/30
BR2S0/0/0.210
10.1.1.6/30
S0/0/0.120
10.1.1.5/30
DLCI = 110
DLCI = 120SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
HQ
DLCI = 210
DLCI = 110
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WAN
BR1S0/0/0.1
10.1.1.1/24S0/0/0
10.1.1.2/24
BR2S0/0/0
10.1.1.3/24
DLCI = 110
DLCI = 120
HQ
DLCI = 210
DLCI = 110
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WAN
BR1S0/0/0.1
10.1.1.1/24S0/0/0
10.1.1.2/24
BR2S0/0/0
10.1.1.3/24
DLCI = 110
DLCI = 120
HQ
DLCI = 210
DLCI = 110
WAN
BR1S0/0/0.1
10.1.1.1/24S0/0/0
10.1.1.2/24
BR2S0/0/0
10.1.1.3/24
DLCI = 110
DLCI = 120
HQ
DLCI = 210
DLCI = 110
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Business Partner
with a Cisco Router
Regional Office with a
Cisco ASA Firewall
SOHO with
a Cisco
RouterMobile Worker with a
Cisco AnyConnect on
a Laptop Computer
Main Site
Perimeter
Router
Cisco
ASA
Firewall
Internet
Service
Provider
Site-to-Site VPN
Remote Access VPN
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Traditional
Layer 2 WAN
Internetvs.
Central Site
SOHOMobile UserBranch Office
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SSL VPN
Workplace
Resources
Headquarters
Internet
SSL VPN Tunnel
H d tttttttttttttttCisco
AnyConnect
Client
User Computer
with Browser
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Transport IP Header
IP Network IP VPN
Site IP VPN
Site
GRE Tunnel
GRE Header
Passenger (IP) Packet
(Transport Protocol) (Passenger Protocol) (Passenger Protocol)
(Carrier Protocol)
(Pl)
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Internet R2 R1
GRE Tunnel
S0/0/0 S0/0/0
Tunnel0 Tunnel0
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209.165.201.1 209.165.201.2
192.168.2.1 192.168.2.2
Internet R2 R1
GRE Tunnel
S0/0/0 S0/0/0
Tunnel0 Tunnel0
209.165.201.1 209.165.201.2
192.168.2.1 192.168.2.2
Internet R2 R1
GRE Tunnel
S0/0/0 S0/0/0
Tunnel0 Tunnel0
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SNMPNMS
SNMP Manager
SNMP
Agents
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[13:22][cisco@NMS~ ]$ snmpget –v2c -c community 10.250.250.14 .1.3.6.1.4.1.9.2.1.58.0
SNMPv2-SMI::enterprises.9.2.1.58.0 = INTEGER: 11
version community
IP address OID numberobtained
CPU value
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Get some useful information
from the router via SNMP
SNMP
SNMP viewer installed
SNMPR1
10.1.10.10010.1.10.1
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Syslog server installed
Syslog
10.1.10.10010.1.10.1
R1
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NetFlow
Collector
NetFlow-Enabled Router
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Workstation
Flow Consumer Applications
Workstation
Filter
Aggregate
Storage
User
Interface
Config
Files
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Get some useful information
from the router via NetFlow
NetFlowR1
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NetFlow collector installed
NetFlow
10.1.10.10010.1.10.1
R1
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Bootstrap
ROM
ROMMonitor
POST
show version
Console
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Bootstrap
POSTROM Perform POST
Load bootstrap
Locate and load
operating system
Configuration
Locate and load
configuration file
or
enter setup
mode
Flash
TFTP Server
NVRAM
TFTP Server
Console
ROM
1.
2.
3.
4.
5.
6.
7.
Cisco IOS
Software
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Router
boot-up
Load ROMMON
and boot Cisco
IOS manually
Check for
boot
commands
and load
Cisco IOS
0x0
0x1
0x2 – 0xF
No boot command
Load first
Cisco IOS
image
Yes
No
Load Cisco IOS
image from the
TFTP server
Yes
No Load
ROMMON
Check
configuration
register boot
field
Cisco IOS
images in
flash?
Cisco IOS
image on the
TFTP server?
Boot field
Configuration
register:
0x2102
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Router
boots
up
Load startup
config
Yes
No
Try to load
configuration from
TFTP server
Yes
No Prompt for initial
configuration
dialog
Startup config
in NVRAM?
Active link
to another
router?
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TFTP Server
tftp:
TFTP flash:
FlashMemory
system:
RAMnvram:
NVRAM
usbflash0/usbflash1:
USB Flash
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TFTP Server
TFTP Server
Router
Router
Flash c2900-universalk9-mz.SPA.152-4.M1.bin
Flash
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c2900-universalk9-mz.SPA.152-4.M1.bin
Platform—Cisco
2900 router
Feature set—
universal
File format—m (runs in
RAM), z (compressed)
Version—115.2(4)M1
File extension—
binary executable
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TFTP Server
172.16.1.100
Router
Flash
c2900-universalk9-mz.SPA.152-4.M1.bin
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TFTP Server
2001:DB8:AC10:100::64
Router
Flash
c2900-universalk9-mz.SPA.151-4.M5.bin
c2900-universalk9-mz.SPA.152-4.M1.bin
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Configuration
NVRAM
TFTP Server
copy running startup
copy startup running ( merge)
configure terminal ( merge)
RAM
copy tftp: running ( merge)
copy run tftp:
copy tftp: start
copy start tftp: Blank
erase start
ge)
Configuration
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interface GigabitEthernet0/0
ip address 10.1.1.1 255.255.255.0
!
interface GigabitEthernet0/1
ip address 10.2.2.2 255.255.255.0
!
interface Serial0/0/0
no ip address
interface GigabitEthernet0/1
ip address 172.16.1.1 255.255.255.0
!
interface Serial0/0/0
ip address 192.168.1.1 255.255.255.0
interface GigabitEthernet0/0
ip address 10.1.1.1 255.255.255.0
!
interface GigabitEthernet0/1
ip address 172.16.1.1 255.255.255.0
!
interface Serial0/0/0
ip address 192.168.1.1 255.255.255.0
copy tftp running-config
Running configuration: Configuration on TFTP server:
Merged running
configuration:
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0 Copy "running-config" to "startup-config"
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Purchase a Package or Feature
Receive a PAK
Obtain a License(PAK and UDI is required)
Receive License File
Cisco License Manager
Cisco License Portal
OR
Install License
1
2
3
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SP Services Enterprise BaseAdvanced Security
Advanced Enterprise Services
IP Voice
IP Base
Enterprise ServicesAdvanced IP Services
Prior to Cisco IOS 15 Licensing
Universal Image Cisco IOS 15 Licensing
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Install Permanent License
R1
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Install Evaluation License
R1
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Backing up the License
R1
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Uninstalling the License
R1
X
Uninstalling the License
R1
X
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