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eigrp was continuously flapping between 300 MB ckt

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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