ASR 1002 - High CPU - IP RIB UPDATE

[drin.zeqiraj]

Greetings All,

I have a strange problem with Cisco ASR 1002.

During the process of BGP flap with Upstream my router needed around 30 min to get fully recovered.

Around 650K routes learned from this BGP peer.
Routes get learned for 5-10 min from BGP peer.

But CPU stays high for another 15-20 min.

Process that was consuming CPU was IP RIB UPDATE

Hope someone encountered this issue and found a solution.

Regards,

Daz

[Georg Pauwen]

Hello,

you are receiving the full BGP routing table from your BGP peer. That by itself is fairly CPU intensive.

That said, do you have 'soft reconfiguration' configured by any chance with one or more of your neighbors ? This doubles the size of the routing table.

Can you post the config of the router, as well as the version you are running (as this could be a bug as well) ?

[drin.zeqiraj]

Hi,

This is router version and image:
cisco ASR1002-F (2RU)
asr1000rp1-advipservicesk9.03.13.00.S.154-3.S-ext

About configuration there isn't Soft reconfiguration configured.

Configuration related this BGP peer:

router bgp x
neighbor Y.Y.Y.Y remote-as Y
neighbor Y.Y.Y.Y update-source GigabitEthernet0/0/1
neighbor Y.Y.Y.Y version 4
neighbor Y.Y.Y.Y timers 60 180
address-family ipv4
neighbor Y.Y.Y.Y activate
neighbor Y.Y.Y.Y send-community
neighbor Y.Y.Y.Y next-hop-self
neighbor Y.Y.Y.Y remove-private-as
neighbor Y.Y.Y.Y route-map routemap-in in
neighbor Y.Y.Y.Y route-map routemap-out out

[Georg Pauwen]

Hello,

I don't know the configuration of your upstream router, but since you have the 'next-hop-self' configured I assume it is an iBGP peer. What IGP are you using ?

It might be useful to post the full config of both this and the upstream router...

[drin.zeqiraj]

Hi,

This is Peer with provider so i don't have access in their routers configuration.

But this is eBGP peer. 

Im using OSPF as IGP.

Please let me know if you need specific configuration because i cannot share all configuration. 

thank you 

daz

[drin.zeqiraj]

Hi All,

Does anyone has any idea.

Should i try to change Image version.

To me it looks like a BUG.

DAZ