[c-nsp] Bug with IOS-XR and SPAN ports?

[James Bensley]

On 9 November 2016 at 21:24, Hank Nussbacher <hank at efes.iucc.ac.il> wrote:
> We upgraded our AS9010 this morning from 5.1.3 to 5.3.3 and encountered
> an issue with SPAN ports.
>
> Our SPAN port config looks like this:
> monitor-session No1 ethernet
>  destination interface TenGigE0/1/1/4
> !
> monitor-session No2 ethernet
>  destination interface TenGigE0/1/1/5
> !
> interface GigabitEthernet0/1/0/10
>  monitor-session No1 ethernet
> !
> interface TenGigE0/0/1/2
>  monitor-session No2 ethernet
> !
> interface TenGigE0/1/1/7
>  monitor-session No1 ethernet
> !
> interface TenGigE0/1/1/7.100
>  monitor-session No1 ethernet
> !
> interface TenGigE0/1/1/7.333
>  monitor-session No1 ethernet
> !
> interface TenGigE0/1/1/7.667
>  monitor-session No1 ethernet
>
> On IOS-XR 5.1.3 - no problem with the above config.  On IOS-XR 5.3.3 we
> found that when the destination SPAN port gets overloaded, in addition
> to dropping the pkt destined to the destination port (no big deal),
> IOS-XR also silently drops the pkt from the port that was being SPANed
> (yes, a big deal).  Has anyone encountered this, or has a workaround or
> a Cisco bugid?
>
> Thanks,
> Hank

Hi Hank,

Did you get to the bottom of this? This could be quite a problem. Did
you find out if it was a bug per chance?

Cheers,
James.