Router interface flap

[gkurunthasalam]

Hi Team,

I have a 2800 series router where wan link is getting flapped. when I have raised a ticket with concern with ISP they advised that interface is flapping at my end.I have check my router logs where I could not able to find any details about interface flap. could you please advise the command to check interface flap or how to check the interface up time?

Regards

Gokul Kurunthasalam.

[Reza Sharifi]

Hi,

If the interface is flapping it might be an auto negotiation issue.  You may want to talk to your provider and hard set the port speed on both sides and test again.

HTH

[gkurunthasalam]

Hi,

Duplex settings are matching. Is there any command to check interface up time?

regards

Gokul K

[Carlos Villagran]

Hello,

If you are using a routing protocol to communicate with your ISP, you can check the neighboring uptime with commands like:

Show ip ospf neighbor

Show ip eigrp neighbor

Show ip bgp summary

In case you are not using any Routing Protocol, maybe your ISP configured Frame Relay as encapsulation type so you can check the uptime with show ip frame pvc.

Are you seeing any input errors in router interface such as CRCs or Runts?

Best Regards.

JC