Solved: ASR9K| packet drop when pinging next hop provider.

rittam bhattacharya · ‎05-01-2016

Hello Guys,

I have a ASR9k and one of its interface connected to provider BT. multiple subinterface and corresponding VRFs are configured on this 10G link.

The issue is: when I am pinging the next-hop (BT interface ip address) with count 1000 and mtu size 1500 I am getting a patterned drop and 98% success. this 2% packet drop is affecting the voice traffic over it.

My MTU configured as 8900 and BT mtu configured as 9058, and as there is no over traffic hence I don't think the configured Qos policy is applying on traffic.

Userend to server the pinging is fine but still I am getting 2% drop on point to point pinging on provider link, can you please give some idea about this to resolve ?

Vinit Jain · ‎05-04-2016

Hello,

i think this is expected. SInce this is a patterned drop, this indicates that there is traffic is being rate-limited or some kind of CoPP coming into play.

In IOS XR, LPTS is playing that role. It is possibly rate limiting the traffic since the ping packets are destined towards the CPU.

You may refer to the below document by Xander:

https://supportforums.cisco.com/document/93456/asr9000xr-local-packet-transport-services-lpts-copp

Hope this clarifies

Regards

Vinit

Thanks
--Vinit

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Vinit Jain · ‎05-04-2016