eigrp was continuously flapping between 300 MB ckt
Issue :Eigrp was continuously flapping between 300 MB ckt
Jan 31 07:38:06.191 UTC: %DUAL-5-NBRCHANGE: EIGRP-IPv4 224: Neighbor 143.98.217.2 (GigabitEthernet0/0/2) is up: new adjacency
Jan 31 07:38:53.433 UTC: %DUAL-5-NBRCHANGE: EIGRP-IPv4 224: Neighbor 143.
98.217.2 (GigabitEthernet0/0/2) is down: retry limit exceeded
Jan 31 07:38:56.759 UTC: %DUAL-5-NBRCHANGE: EIGRP-IPv4 224: Neighbor 143.98.217.2 (GigabitEthernet0/0/2) is up: new
Root Cause :- System Interface MTU was causing error :-
r02-new#ping 143.98.217.1 size 1550 df-bit
Type escape sequence to abort.
Sending 5, 1550-byte ICMP Echos to 143.98.217.1, timeout is 2 seconds:
Packet sent with the DF bit set
…..
Success rate is 0 percent (0/5)
r02-new#ping 143.98.217.1 size 1536 df-bit
Type escape sequence to abort.
Sending 5, 1536-byte ICMP Echos to 143.98.217.1, timeout is 2 seconds:
Packet sent with the DF bit set
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
r02-new#
Solution :-
R01(config)#int gi0/3
R01(config-if)#mtu 1536
R01(config-if)#^Z
R01#sh ip eigrp nei
EIGRP-IPv4 Neighbors for AS(224)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
2 143.98.217.1 Gi0/3 14 00:09:26 17 200 0 896470
R01#
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