Posted on Monday, 23rd August 2004 by sean
In the last article about EIGRP, I’ll go over some of the show and debug commands relevant to the operation of EIGRP.
Show the established neighbours:
r0#show ip eigrp neighbors
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq Type
(sec) (ms) Cnt Num
1 192.168.1.136 Et0 13 00:00:29 404 2424 0 18
0 192.168.1.93 Et0 13 00:00:29 12 200 0 26
Watch the uptime and sequence numbers… Low uptime and increasing sequence numbers mean flapping. If there is a problem establishing an adjacency, you’ll see the process “waiting for init ack” or something similar:
r0#show ip eigrp neighbors detail
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq Type
(sec) (ms) Cnt Num
0 192.168.1.136 Et0 14 00:00:00 1 2000 1 0
Last startup serial 2
Version 12.2/1.2, Retrans: 0, Retries: 0, Waiting for Init, Waiting for Init Ack, reinit for 576 msec
To debug neighbor adjacency problems, debug eigrp packets hello:
r1#debug eigrp packets hello
EIGRP Packets debugging is on
(HELLO)
11:39:21: EIGRP: Received HELLO on Serial0.101 nbr 172.18.0.2
11:39:21: AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
11:39:21: EIGRP: Sending HELLO on Ethernet0
11:39:21: AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
11:39:22: EIGRP: Received HELLO on Ethernet0 nbr 192.168.1.93
11:39:22: AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
11:39:24: EIGRP: Received HELLO on Ethernet0 nbr 192.168.1.134
11:39:24: AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/1
11:39:24: EIGRP: Sending HELLO on Serial0.101
11:39:24: AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
11:39:26: EIGRP: Received HELLO on Serial0.101 nbr 172.18.0.2
11:39:26: AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
As a note, there are debug commands under both “debug eigrp” and “debug ip eigrp”.
Showing the topology entries for a route helps to figure out the metric calculations, and why one route may be preferred over another one:
r1#show ip eigrp topology 10.0.1.0/24
IP-EIGRP (AS 1): Topology entry for 10.0.1.0/24
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2313984
Routing Descriptor Blocks:
172.18.0.2 (Serial0.101), from 172.18.0.2, Send flag is 0x0
Composite metric is (2313984/304128), Route is Internal
Vector metric:
Minimum bandwidth is 1544 Kbit
Total delay is 25630 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 2
192.168.1.93 (Ethernet0), from 192.168.1.93, Send flag is 0x0
Composite metric is (2339584/2313984), Route is Internal
Vector metric:
Minimum bandwidth is 1544 Kbit
Total delay is 26630 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 3
Those are the big ones… You can get into the details of the packets under debug eigrp packets, or debug eigrp fsm to troubleshoot SIA routes.
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