I know it's pretty basic, but can we see sanitized versions of the
relevant portions of your configs? What IOS are you running on your
routers? Are there other devices hanging off of the switch that are in
the same subnet as the routers? If so, what are they?
John
>>> "John Starta" 2/25/03 12:11:53 PM >>>
I'm currently experiencing an oddity with multicast traffic like HSRP
that
I'm looking for some ideas on. For simplicity the network design
consists
of 2 Cisco 3640 routers running HSRP between them connected to a single
Extreme [Black Diamond] switch. Basically...
extreme switch
| |
| |
rtr1 rtr2
Normally everything works just fine, but periodically -- in time, not
quantity -- HSRP indicates via the %HSRP-4-DUPADDR message that I have
a
duplicate [IP] address. (The quantity of the messages indicating the
duplicate IP address ranges from half dozen to nearly a hundred. The
time
between messages closely matches the HSRP HELLO interval.)
When I receive these messages, on the active HSRP router for instance,
they
indicate the duplicate address as being the physical interface IP
address
of the active HSRP router with the source MAC address as the virtual
MAC
[address] of the active HSRP router. Receipt of these %HSRP-4-DUPADDR
messages indicating the duplicate as itself suggests an issue with
multicast -- a loop of sorts whereby the switch copies the multicast
announcement [back] to the same switch port it originated. Keep in mind
that there are no interface or HSRP state changes so the messages
probably
aren't coming from the standby HSRP router. (Especially since the
indicated
duplicate IP address is that of the physical interface on the active
HSRP
router, not the virtual IP.)
I did some poking around on Extreme's web site and they indicate an
issue
with HSRP in an earlier version of code, but that is/was fixed in the
version being used.
Have anybody run into this before? Ideas regarding cause? I don't have
access to the switch since it belongs to the customer.
.,
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