enhanced igrp (eigrp) eigrp characteristics. eigrp configuration. verifying eigrp
TRANSCRIPT
Enhanced IGRP (EIGRP)
• EIGRP Characteristics.
• EIGRP Configuration.
• Verifying EIGRP.
EIGRP Characteristics
• Hybrid Protocol.• Cisco-proprietary protocol.• EIGRP works well in large networks.• Default AD (administrative distance) is 90.• EIGRP Metrics use a combination of (B.W,
Load, Delay and Reliability)• Uses an autonomous system number.• Maximum Hop count is 255.• Classless Routing.• Support VLSM and discontiguous networks.
EIGRP Characteristics
• Support for IP, IPX, and AppleTalk via protocol-dependent modules
• Communication via Reliable Transport Protocol (RTP)
• Best path selection via Diffusing Update Algorithm (DUAL)
• Build three table: -1.Neighbor table: Each router keeps state
information about adjacent neighbors.2.Topology table: acted upon by (DUAL). Use to
determine the best path for routing packet.3.Routing table: Store routes.
EIGRP Configuration
EIGRP Configuration• Configuring Discontiguous Networks
Lab_A(config)#router eigrp 100Lab_A(config-router)#no auto-summaryLab_B(config)#router eigrp 100Lab_B(config-router)#no auto-summary
Verifying EIGRP
CommandDescription/Function
show ip routeShows the entire routing table
show ip route eigrpShows only EIGRP entries in the routing table
show ip eigrp neighbors
Shows all EIGRP neighbors
show ip eigrp topologyShows entries in the EIGRP topology table
Open Shortest Path First
• OSPF Characteristics.
• OSPF Terminology
• OSPF Configuration.
• Verifying OSPF.
• OSPF and Loopback Interfaces.
• Troubleshooting OSPF.
OSPF Characteristics• Link State Protocol.• Open Standard protocol.• OSPF works well in large networks.• Default AD (administrative distance) is 110.• EIGRP Metrics use Bandwidth.• Uses an autonomous system number.• No Limit Hop count.• Classless Routing.• Support VLSM and discontiguous networks.
OSPF Characteristics• Support IP only.
• Best path selection via Dijkstra algorithm.
• Manual Summarization.
• Build three table: -1. Neighbor table: Each router keeps state
information about adjacent neighbors.2. Topology table: acted upon by (Dijkstra). Use to
determine the best path for routing packet.3. Routing table: Store routes.
OSPF Terminology
OSPF Terminology
Link is an interface on a router.
The Router ID (RID) is the highest IP address used to identify the router.
OSPF Terminology
Link-State: the status of link between two routers
OSPF Terminology
Link-state database (topological database): A list of information about all other routers in the internetwork. It
shows the internetwork topolog.
OSPF Terminology
Area: A collection of routers that has the same area identification. Each router within an area has the same link-state information. A router within an area is called an
internal router.
OSPF Terminology
Cost (metric): The value assigned to a link. Based on the bandwidth of the link.
OSPF Terminology
Routing table: sometimes known as the forwarding database.
OSPF Terminology
Adjacencies database: A listing of all the neighbors to which a router has established a bi-directional communication.
OSPF Terminology
Designated router (DR) and backup designated router (BDR): A router that is elected by all other routers on the same LAN to represent all the routers. Each network has a DR and BDR.
OSPF Configuration
The two basic elements of OSPF configuration:1. Enabling OSPF.2. Configuring OSPF areas.
Router#config t
Router(config)#router ospf 1
Router(config-router)#network 10.0.0.0 0.255.255.255 area 0
Verifying OSPF
CommandDescription/Function
show ip routeShows the entire routing table
show ip ospfDisplay OSPF information for one or all OSPF processes running on the router.
show ip ospf database
the number of links and the neighboring router’s ID
show ip ospf interface
Displays all interface-related OSPF information.
OSPF and Loopback Interfaces
• Configuring loopback interfaces when using the OSPF routing protocol is important, and Cisco suggests using them whenever you configure OSPF on a router.
• Loopback interfaces are logical interfaces, which are virtual, software-only interfaces; they are not real router interfaces.
• Configuring Loopback Interfaces
Router (config)#int loopback 0
Router (config-if)#ip address 172.16.10.1 255.255.255.255
Router(config-if)#no shut
Troubleshooting OSPFWhat is the error in this configuration if you want to route only ip
packet begin with 10 then any number ?Router(config)#router ospf 1Router(config-router)#network 10.0.0.0 255.0.0.0 area 0
RouterA#sh ip ospf interface e0/0Ethernet0/0 is up, line protocol is up
Internet Address 172.16.1.2/16, Area 0
Process ID 2, Router ID 172.126.1.1, Network Type BROADCAST, Cost: 10
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 172.16.1.2, interface address 172.16.1.1
No backup designated router on this network
Timer intervals configured, Hello 5, Dead 20, Wait 20, Retransmit 5
RouterB#sh ip ospf interface e0/0Ethernet0/0 is up, line protocol is up
Internet Address 172.16.1.1/16, Area 0
Process ID 2, Router ID 172.126.1.1, Network Type BROADCAST, Cost: 10
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 172.16.1.1, interface address 172.16.1.2
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5