[c-nsp] ICMP Query : Duplicate Reply

[Ryan O'Connell]

On 18/03/2006 06:56, Gangasagar Amula wrote:
> Hi All,
>
> Scenario:
> The below output was captured when we are pinging from one vlan to other vlan.
> We have 4006 Switch involved in between.
>   


What is your physical topology like? (A quick ASCII-art line drawing
would be fine)

This looks very much like a problem I have had with certain IOS-based
switches that do not correctly block incoming traffic on STP-disabled
ports coupled with upstream switches/routers that are flooding unknown
unicast because they are HSRP backups and not seeing traffic.