[c-nsp] Crash iBGP on 7600 during mVPN reconfiguration

[Rob Taylor]

Hi Anrey,

Did you investigate the high cpu on the bsr-candidate node before 
starting down this process of ripping out vrf relavant configs?

Sounds like you may have caused iBGP to go down (I would not term it a 
crash), likely due to high cpu resulting from the removal of multiple 
vrfs at the same time.  Seems that all the configuration removal that 
you did was just a continuous snowball of route-churn/high cpu inducing 
commands.

If I were you, I would go back to the scenario where you just had high 
cpu on the one device, and where the full multicast configuration was 
deployed as had been successfully tested, and get TAC on the line to see 
how they are related.

Do you have any output captured from when you had high cpu the first time?

Rob



On 10/12/2010 9:32 AM, Anrey Teslenko wrote:
> Hello all,
>
> We are trying to implement multicast VPN in our network.
> On PE routers which we use now installed 12.2 (33r) SRE2    IOS
> The hardware platform is 7604 RSP720
>
> The typical configuration was implemented on routers and was successful
> tested, but
> after finishing the tests, we were observed high cpu utilization on
> bsr-candidate (not on RP)
> and on it BGP neighbor, which don't participate in multicast routing.
>
> However this no so badly how  the removal vrfs (no ip vrf) which participate
> in MVPN.
> We were observed crash of all iBGP session after this command was applied.
>
> I find only the case CSCse41600 which nearest for my problem, but the router
> not crashed, only iBGP.
> Bgp sessions were cleared  but this don't help and only after full reload
> problem was resolved.
> Workaround (CSCse41600) doesn't help -- I trying delete MVPN step by step,
> the first was replaced bgp configuration, then has removed ip pim  and ip
> forwarding vrf from
> all used interfaces, then "no multicast routing", only after that I began
> remove configuration in vrf line by line.
> However after deleting default tree configuration (no mdt default ) iBGP
> sessions crashed  again.
>
>
> Can someone please give me some hints to solve this problem?
> Can it's not  good idea to use SRE2 for MVPN?
>
>
> Thanks in advance!
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