05-09-2012 01:01 AM - edited 03-04-2019 04:18 PM
Dear All Guy,
I get some EIGRP flapping on my CE router (c2921) 2 subinterface to another two site. The router IOS version "c2900-universalk9-mz.SPA.152-2.T1". I capture the debug log as attached. I know understand some log meaning from the debug, Can anybody help to explain the log detail who flapping will happen. Thank you so much.
Solved! Go to Solution.
05-09-2012 07:35 AM
Hello Jason,
as Dan has noted the link is not stable at OSI layer2 and layer1 as a result of this EIGRP flaps.
You need to fix the problems at physical layer and then also EIGRP will be stable
What is connected to gi0/1 of the device with IP 10.7.10.5 ?
show interface gi0/1
is your starting point
Hope to help
Giuseppe
05-09-2012 01:08 AM
Hi Jason,
Your phisical interface is flapping :
9 00:37:37.787: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to down
00:37:39.787: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up
00:40:18.785: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to down
Dan
05-09-2012 01:23 AM
Thank Dan,
But do you understand the EIGRP log, why flapping will happen?
05-09-2012 07:35 AM
Hello Jason,
as Dan has noted the link is not stable at OSI layer2 and layer1 as a result of this EIGRP flaps.
You need to fix the problems at physical layer and then also EIGRP will be stable
What is connected to gi0/1 of the device with IP 10.7.10.5 ?
show interface gi0/1
is your starting point
Hope to help
Giuseppe
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