EIGRP failover

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Aug 21st, 2008
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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

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Giuseppe Larosa Thu, 08/21/2008 - 10:20
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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


J2NoomSai_2 Thu, 08/21/2008 - 10:28
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Thanks Giuseppe. So after certian amount of age time, it will route to router B, if can not route to Router A?


Giuseppe Larosa Thu, 08/21/2008 - 10:34
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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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