[c-nsp] NCS-5001 - MPLS L3VPN Issue

James Bensley jwbensley at gmail.com
Tue Feb 2 08:16:05 EST 2016

On 2 February 2016 at 12:47, Mikael Abrahamsson <swmike at swm.pp.se> wrote:
> On Tue, 2 Feb 2016, James Bensley wrote:
>> IOS-XR is much needed but jesus christ its been buggy as hell for us on
>> the 9000 series routers.
> Stable, cheap, fast. Pick any two.
> I am not aware of any product the past 10-15 years that didn't have serious
> bugs at first customer shipment. If you want something that works, wait 1-2
> years after first customer shipment and try it, then it usually works. Now,
> at that time it's not fast and cheap anymore...

This paradigm only goes so far, Cisco have missed some very basic
testing indeed. I mean, it looks to us like they've barely tested the
code and just shipped it. We've got a nice race condition at the
minute an amature programmer could spot. Processes getting stuck in an
infinite loop and locking up the CPU.

It’s been years since IOS-XR was released on ASR9000's, no excuse now
for basic features still not working. The TAC responses aren’t helpful
either; things like "running an Inter-AS MPLS Option B and BGP-LU at
the same time is not supported" - So we can have labelled VPN routes,
or labelled GRT routes but not both? In this day and age! Someone once
said to us “Inter-AS MPLS Opt C isn’t supported at all” - which we
were running on the PE/ASBR under investigation. We’ve had bucket
loads of issues/TAC cases (we are still opening TAC cases at a decent

My mind is pretty set on this, their testing has been appalling (I’m
obviously moaning at Cisco about this) – I’d like to know what others


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