EIGRP Neighbors

IP EIGRP Neighbors

 

When a router discovers and forms an adjacency with a new neighbor, it records the neighbor’s address and the interface through which it can be reached as an entry in the neighbor table.

 

R1>en

R1#config t

Enter configuration commands, one per line.  End with CNTL/Z.

R1(config)#int f0/0

R1(config-if)#ip address 10.1.1.1 255.255.255.0

R1(config-if)#no shut

R1(config-if)#exit

R1(config)#router eigrp 100

R1(config-router)#network 10.2.2.0

R1(config-router)#no auto-summary

R1(config-router)#end

R1#wr

R3>en

R3#config t

Enter configuration commands, one per line.  End with CNTL/Z.

R3(config)#int fa0/1

R3(config-if)#ip address 10.2.2.2 255.255.255.0

R3(config-if)#no shut

R3(config-if)#exit

R3(config)#router eigrp 100

R3(config-router)#network 10.1.1.1

R3(config-router)#no auto-summary

R3(config-router)#end

R3#wr

R2>en

R2#confi t

R2(config)#int fa0/0

R2(config-if)#ip address 10.1.1.2 255.255.255.0

R2(config-if)#no shut

R2(config-if)#exit

R2(config)#router eigrp 100

R2(config-router)#network 10.2.2.0

R2(config-router)#end

R2#

R2#config t

R2(config)#int fa0/1

R2(config-if)#ip address 10.2.2.1 255.255.255.0

R2(config-if)#no shut

R2(config-if)#exit

R2(config)#router eigrp 100

R2(config-router)#no auto-summary

R2(config-router)#exit

R2#wr

R2#sho ip eigrp ne

IP-EIGRP neighbors for process 100

H   Address                 Interface       Hold      Uptime    SRTT   RTO   Q    Seq

                                                 (sec)                 (ms)           Cnt   Num

1   10.2.2.2                Fa0/1             11     00:00:22   36     216    0      3

0   10.1.1.1                Fa0/0             12      00:02:33   82    492    0      3

H = this list the order in which the peering session was established with specified neighbor

Address = the neighbors’ address in this example 10.2.2.2 and 10.1.1.1

Interface = the interface on this router trough witch it is receiving hello packet. in this example R2

Hold time= the maximum time in seconds the router will wait before it will declare the neighbor unavailable

up time = H:min:sec since the local router first heard from the neighbor

SRTT= Smooth Round Trip Timer- the time that will take for the packet to reach the neighbor and back to local router for acknowledgement in MILLISECONDS

RTO= the time the router waits for acknowledgement before retransmitting a reliable packet to the neighbor

Q = queue count, the number of (update, query and replay) waiting in the queue to be sent out. if > then 0 then there is a problem.

Seq = sequence number of the last update received from the neighbor