[nsp] SSO & NSF experience on Cisco 7500 routers

[Dan Armstrong]

We set one of our core transit GSRs up in SSO mode, and tried it.  We
ripped the primary route processor card out, and the router switched over
perfectly.... we had a ping running towards one of our transit carriers,
and it did drop one ping.  We were elated.

Both of the carriers we had peered on this router claimed to have bgp
graceful-restart on their NSF aware routers.  MCI was the only one that
actually worked.  The BGP sessions with everybody else dropped like
stones.

About half an hour later, however, a dCEF bug showed up, and the router
started slowly leaking routes.  We tried to clear the cef table... no
dice.  We had to power cycle the box.

We have gone back to RPR+.

I guess SSO/NSF is a great "tradeshow" feature, but in the real world
just doesn't work.

Oh well.

Dan.



"ALBERTO.CITA at telefonica.net" wrote:

> Hi,
>
> I'm planning to configure SSO in a leased-line aggretion layer based
> on Cisco 7507 and 7513 routers with a 12.0S train IOS release. I'm
> also considering the possibility of enabling graceful restart
> capabilities(i.e.: NSF in Cisco's parlance)for CEF, IS-IS and BGP in
> these routers, together with NSF-Aware capabilities in our route-
> reflectos (C7200)and backbone routers (C12000).
>
> I have never tried this in a production environment and I was
> wondering if somebody out there, who has already deployed it in a
> production network (or may be has heard of it), would be so kind to
> share his/her experiences in this field.
>
> More specifically does it really works as explained in Cisco's
> documentation? I mean, is it stable? does it really reduces the
> switchover between RSPs when comparing it with RPR+? Is it true that
> the VIPs and PAs installed in the router are nor reseted and reloaded?
> How about interoperability with Juniper's graceful restart? any
> feedback about it?
>
> Thank you very much indeed, in advance.
>
> Best Regards,
> Alberto Cita.
> nec spe nec metu
>
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/