[c-nsp] warning about important ERSPAN bug in 6500/7600 code (SX/SR trains)

[Phil Mayers]

On 01/10/2013 11:24 AM, Mikael Abrahamsson wrote:
>
> Hello.
>
> CSCsb70129 means an ERSPAN session which is in administrative shutdown
> ("shutdown" issued in the ERSPAN config), might start to ERSPAN traffic
> even though the config says otherwise. Triggers might be that the source
> port specified in the ERSPAN config goes down and comes up again (there
> are others, like changing the config).

So *that's* what triggered it. We saw this a while back - I didn't spend 
any time on it at all (and opening a TAC case for anything other than an 
enormously obvious bug is a waste of time these days) but assumed it had 
been fixed in later SW.

>
> So I recommend everybody to not leave ERSPAN session config around in
> shutdown state, instead delete whole or partial config (deleting source
> interface should be sufficient).
>
> The bug is closed and there are no plans to fix this it seems, which I
> find very strange. I have escalated this.

That's pretty tragic. I might poke our AM and chime in with support.