Master of Engineering in

Internetworking

TROUBLESHOOTING LAB

INWK 6113

GROUP NUMBER:

GROUP MEMBERS:

Issues resolved in part 11) In router 2 dlci 201 is mapped instead of 301.2) In Router 4 the ip address was no broadcasted.3) In router 3 Static mapping was not done.

Configurations of routers after making amendments.It contains Show frame map and details of serial interfaces of router1,2,3 and 4.8R1#show frame mapSerial0/0/0 (up): ip 28.8.134.3 dlci 103(0x67,0x1870), static, broadcast, CISCO, status defined, activeSerial0/0/0 (up): ip 28.8.134.4 dlci 104(0x68,0x1880), static, broadcast, CISCO, status defined, active8R3(config)#do show frame mapSerial0/0/0 (up): ip 28.8.134.4 dlci 301(0x12D,0x48D0), static, broadcast, CISCO, status defined, activeSerial0/0/0 (up): ip 28.8.134.1 dlci 301(0x12D,0x48D0), static, broadcast, CISCO, status defined, active

8R4#show frame mapSerial0/0/0 (up): ip 28.8.134.1 dlci 401(0x191,0x6410), static, broadcast, CISCO, status defined, activeSerial0/0/0 (up): ip 28.8.134.3 dlci 401(0x191,0x6410), static, broadcast, CISCO, status defined, active

Show run Router 1

interface Serial0/0/0 ip address 28.8.134.1 255.255.255.0 encapsulation frame-relay frame-relay map ip 28.8.134.3 103 broadcast frame-relay map ip 28.8.134.4 104 broadcast no frame-relay inverse-arpShow run router 2interface Serial0/0/0 no ip address encapsulation frame-relay clock rate 2000000 frame-relay intf-type dce no frame-relay route 102 interface Serial0/1/0 201 frame-relay route 103 interface Serial0/0/1 301

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frame-relay route 104 interface Serial0/1/0 401!interface Serial0/0/1 no ip address encapsulation frame-relay clock rate 2000000 frame-relay intf-type dce frame-relay route 301 interface Serial0/0/0 103!interface Serial0/1/0 no ip address encapsulation frame-relay clock rate 2000000 frame-relay intf-type dce frame-relay route 401 interface Serial0/0/0 104Show run router 3interface Serial0/0/0 ip address 28.8.134.3 255.255.255.248 encapsulation frame-relay frame-relay map ip 28.8.134.4 301 broadcast frame-relay map ip 28.8.134.1 301 broadcast frame-relay interface-dlci 301 no frame-relay inverse-arp frame-relay lmi-type ciscoshow run router 4interface Serial0/0/0 ip address 28.8.134.4 255.255.255.0 encapsulation frame-relay no fair-queue frame-relay map ip 28.8.134.1 401 broadcast frame-relay map ip 28.8.134.3 401 broadcast no frame-relay inverse-arp

ping router 4 to router 38R4#ping 28.8.134.3Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 28.8.134.3, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 1/4/8 msping router 4 to router 18R4#ping 28.8.134.1Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 28.8.134.1, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms8R4#

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Traceroute router 4 to router 38R4#traceroute 28.8.134.3Type escape sequence to abort.Tracing the route to 28.8.134.3VRF info: (vrf in name/id, vrf out name/id) 1 28.8.134.1 4 msec 0 msec 0 msec 2 28.8.134.3 4 msec * 0 msec.

PART 2:

We created Vlan 30 on switch 8S1 as it wasn’t there in the switch

VLAN Name Status Ports---- -------------------------------- --------- -------------------------------1 default active Gi0/2, Gi0/5, Gi0/6, Gi0/7 Gi0/8, Gi0/9, Gi0/10, Gi0/11 Gi0/12, Gi0/13, Gi0/14, Gi0/15 Gi0/16, Gi0/20, Gi0/22, Gi0/2410 VLAN0010 active Gi0/130 VLAN0030 active40 VLAN0040 active Gi0/41002 fddi-default act/unsup1003 token-ring-default act/unsup1004 fddinet-default act/unsup1005 trnet-default act/unsup

We Defined two static routes on 8R1 to 8R3 & 8R48R1#show run | i ip routeip route 28.8.30.0 255.255.255.0 28.8.134.3ip route 28.8.40.0 255.255.255.0 28.8.134.4we Defined single static route on 8R38R3#show run | i ip routeip route 28.8.0.0 255.255.192.0 28.8.134.1

we defined single static route on 8R48R4#show run | i ip routeip route 28.8.0.0 255.255.192.0 28.8.134.1

8R1#ping 28.8.30.1

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Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 28.8.30.1, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms8R1#ping 28.8.134.3Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 28.8.134.3, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms8R1#ping 28.8.40.1Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 28.8.40.1, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms8R1#ping 28.8.134.4Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 28.8.134.4, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms8R1#ping 28.8.10.1Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 28.8.10.1, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms

PART 2:

1. Explain in brief how inverse-ARP works in a frame-relay network, and the advantages and disadvantages when compared to static mapping. Note inverse-ARP is disabled in our troubleshooting lab.

Inverse-Arp:The static maps will map an IP address to a DLCI however, Inverse ARP does it automatically. Inverse ARP will attempt to learn its neighboring devices IP addresses and automatically create a dynamic map table.Advantage:Configuring Frame Relay Inverse ARP is actually quite simple. It is on by default on all Frame Relay multipoint interfaces.Disadvantage:Problems arise from this feature such as routing loops or sub-optimal routing

2. There are two frame-relay encapsulation types and three LMI types, what are they and what’s the default settings? Do you need to match between the frame-relay switch and the client site routers?

FR encapsulation:

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Two frame relay encapsulation types are: i) LMIii) IETF

IETF Frame Relay encapsulation- used to connect a Cisco router to a non-Cisco router

Three LMI types i) Ansi ii) Ciscoiii) Q.933A

Default type is LMI-type cisco. We need to match the frame relay encapsulation on frame relay switch and client routers.

Frame Relay LMI needs to be matched between each couple of DTE-DCE devices (client FR routers and FR Provider switch). The FR Switch device is responsible for managing and maintaining status between the devices so need to understand the format the client DTE is using.

Consequently DTE router and DCE router with different LMI type will not be able to communicate.

3. If xR3 sends broadcast traffic to the frame relay cloud, will it receive and reply from xR4? Why or Why not?

FR WAN is a Non-Broadcast Multi-Access (NBMA), these networks allow for multi-access, but have no broadcast ability like Ethernet

The hub will have to route between 2 DLCIs in order to pass traffic from one spoke to another. This means that broadcast traffic will not be forwarded between the spokes.xR4 will not receive and reply the broadcast traffic. (We are considering the hub and spoke scenario).

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