From: Senthil Kumar (senthil.kumar@intechnology.co.uk)
Date: Fri Sep 20 2002 - 08:31:20 GMT-3
i've got a weired problem..you might be able to help.
router1-------------gig---------------router2
| |
| |
switch1-------------trunk----------switch2
| | | |
| .254.251.4 | .254.251.5
.253.4 .253.251.5
i have two routers running trunks to two switches, the switches are
connected with a trunk.
i have made a sub interface 100 in both routers interfaces with dot1q encap,
and vlan 100 in both switches.
i created two ip subnets 10.254.251.0/24 and 10.253.251.0/24 on both
routers.
i run hsrp for both these subnets with .1 as the gateway ip. .2 for router 1
and .3 for rotuer 2.
problem:
hosts on 10.254.251.0/24 subnet connected to the swtich on vlan 100, can
ping the .1, .2 and .3
but
hots on 10.253.251.0/24 subnet connected to the same switch in same vlan 100
can ping .2 and .3 but not .1 (hsrp address)
when i do a clear arp, everything it fine for 5 mins and the problem
reoccurs.
when the problem exits, the router has got all macs of the hosts and itself,
hsrp mac.
the switch has mac entry for host, hsrp mac, and router interface mac.
the hosts has arp entry for its own mac, and the default gateway's mac
(hsrp).
( but when the host and router cant talk to each other, the router can speak
to other hosts on the same ip subnet, and clients can talk to themselves)
i have disabled hsrp for 10.253.251.0/24 network and assigned the gateway ip
to the physical map and things are fine.
* during all these test, hsrp was stable, and stp for vlan 100 was stable,
all mac entries were there.. so no timeouts could have caused this problem.
i tried matching the arp time out and mac-aging-timers to same value..this
didnot help me in fixing the problem
any thoughts??
Regards, Senthil
#
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