[c-nsp] VTP war stories (was Re: EoMPLS or VPLS loop prevention/storm control)

[Nick Hilliard]

On 09/02/2011 22:10, Martin Barry wrote:
> Nick, that sounds like you have a good war story or three. Care to share?

Mmm, my favourite relate to VTP pruning and the lurking horrors therein. 
  Until at least mid-way through SXF, VTP pruning on c6500s would cause 
ipv6 simply not to work if the two edge nodes were on dot1q tagged 
ports.  The pruning stopped multicast ND packets from being propagated 
down the trunk ports.  The bug may still be there, but I disabled VTP 
around that stage, and haven't checked since.

It bit me recently with ARP broadcast propagation, too.  Box A could arp 
for box B and box B could arp for box C, but box A's ARPs weren't being 
received by box C.  This was on a 3750 stack.  Ugly.

Nick