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Posted by Scott Lowe on January 27, 2006, 9:10 am
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This is probably a really simple question.
In setting up an HSRP configuration last night (Cisco 2800 series
router and a Cisco 871 router, both connected to a Cisco Catalyst 3700
series switch), the failover would occur fine if one of the tracked
interfaces went down (I could use "sho standby" or watch the debug
commands on the console to see the other router come up), but clients
behind the routers lost all connectivity to the virtual IP.
The only way I could make it work was to use "standby use-bia" on both
routers, and then it worked.
Can someone tell me why?
TIA.
--
Scott Lowe
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Posted by luqs on January 27, 2006, 9:17 am
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The switch didnt refresh it mac-address-table fast enough or probably
counted that as an error (there r port -security settings in cisco
switches, make sure they r not turned on)
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Posted by Scott Lowe on January 27, 2006, 9:41 am
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> The switch didnt refresh it mac-address-table fast enough or probably
> counted that as an error (there r port -security settings in cisco
> switches, make sure they r not turned on)
As far as I can tell, the port security settings on the Catalyst were
turned off. As for the timing of the refresh of the MAC address table,
it appeared as if the switch couldn't/wouldn't resolve the virtual MAC
of the virtual IP shared between the two routers (debug output showed
something along the lines of "incomplete ARP entry for W.X.Y.Z", even
though the gratituous ARP messages were being received by the
switch--also shown in debug output). Note that the real MAC addresses
of each router were properly listed.
--
Scott Lowe
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Posted by summi on January 27, 2006, 9:48 am
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Posted by luqs on January 27, 2006, 12:05 pm
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is spanning tree configured? the type of spanning-tree port mayb an
issue
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