08-21-2008 09:49 AM - edited 03-03-2019 11:13 PM
We have two routers, A and B. THey both configure with HSRP so one is active and one is standby. If A down, B will be active. But I need help to configure EIGRP for failover. Let's say if only the circuit on Router A down but not the router, how can the router go through router B?
Thanks
Sai
08-21-2008 10:20 AM
Hello Sai,
>> Let's say if only the circuit on Router A down but not the router, how can the router go through router B?
This is exactly the job of a routing protocol like EIGRP no special config is needed.
You need to have EIGRP running on the link where HSRP is running.
If you want a further link between them with EIGRP running
EIGRP running on a link = network command for the IP subnet of the link under router eigrp
suppose your lan interfaces and serial links are in net 10.1.0.0/16:
You need on both routers:
router eigrp 100
network 10.1.0.0 0.0.255.255
!
Hope to help
Giuseppe
08-21-2008 10:28 AM
Thanks Giuseppe. So after certian amount of age time, it will route to router B, if can not route to Router A?
08-21-2008 10:34 AM
Hello Sai,
yes EIGRP convergence is very fast in the order of few seconds (2-3) to be added to the time the router requires to detect its serial interface is down
(line protocol down needs to fail 3 keepalives :up to 30 seconds).
Notice that you can use HSRP tracking of the serial interface so that active router becomes router B if RA's serial interface fails
RA:
int fas0/0
standby 10 priority 105
standby 10 track ser0/0
standby 10 preempt
RB:
int fas0/0
standby 10 preempt
Hope to help
Giuseppe
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