move two of the T-1s such that you have two circuits per router, and then
run mHSRP (m for multiple or multigroup or similar) between the boxes.
mHSRP is a method of running a pair of HSRP groups between the two routers,
such that one router is active in each group in normal circumstances. To
facilitate load-balancing, point half your machines at each of the HSRP
addresses (ie as default gateways) - this is a little "rough and ready", but
is the simplest way to achieve what you want to do.
When one box fails, the remaining box will become active on both HSRP
groups. To permit failover for circuit failure, have the group on which the
router would normally be active track the state of the WAN interface. With
two circuits you can decide whether to fail over after the failure of one
circuit, or make the priority decrement cumulative for the two circuits,
such that failover will only occur after the failure of the second circuit.
config somethiong like this
R1:
interface FastEthernet0/0
ip address 192.168.1.201 255.255.255.0
standby 1 priority 100
standby 1 ip 192.168.1.204
standby 1 track Serial0/1 45
standby 1 track Serial0/2 45
standby 1 preempt
standby 2 priority 20
standby 2 ip 192.168.1.205
standby 2 preempt
and vice versa on the other router. this is config is to failover after
both circuits fail, to failover after a single failure, up the tracking
decrement to >80.
hth
Andy
----- Original Message -----
From: "Tony"
To:
Sent: Wednesday, May 30, 2001 1:51 PM
Subject: Serial link redundancy [7:6413]
> Quick question:
>
> I have two 3640's running HSRP. Off of one 3640, hang four T1's frame
> connections that are load balanced in OSPF. We have redundancy on the
> hardware and lines, but when the active router drops, the serial
connections
> will have to be physically moved....any workarounds for this and a way to
> keep redundancy?
>
> Thanks,
> Tony
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