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New Member

Multiple routes with hsrp

Hi

I have a two routers configured for hsrp, which are plugged into a 3524 switch which is plugged into a 6509. I am running EIGRP throughout the Network. When I do a "show ip route 10.16.x.x" on my msfc, I see multiple routes i.e. the primary hsrp and the secondary hsrp route to the destination. When I run a traceroute. Below are my "show ip routes" and traceroutes

Rtr-6509-01-DC#sh ip route 10.16.0.0

Routing entry for 10.16.0.0/16

Known via "eigrp 29", distance 170, metric 28416, type external

Redistributing via eigrp 29

Last update from 10.1.0.5 on Vlan2, 1d05h ago

Routing Descriptor Blocks:

* 10.1.0.3, from 10.1.0.3, 1d05h ago, via Vlan2

Route metric is 28416, traffic share count is 1

Total delay is 110 microseconds, minimum bandwidth is 100000 Kbit

Reliability 255/255, minimum MTU 1500 bytes

Loading 1/255, Hops 1

10.1.0.5, from 10.1.0.5, 1d05h ago, via Vlan2

Route metric is 28416, traffic share count is 1

Total delay is 110 microseconds, minimum bandwidth is 100000 Kbit

Reliability 255/255, minimum MTU 1500 bytes

Loading 1/255, Hops 1

Rtr-6509-01-DC#traceroute 10.16.0.10

Type escape sequence to abort.

Tracing the route to 10.16.0.10

1 10.1.0.3 0 msec

10.1.0.5 0 msec

10.1.0.3 0 msec

2 10.16.0.10 88 msec 88 msec 92 msec

Rtr-6509-01-DC#

If first goes to the active router and then the standby and back to active before it routes to the destination.

Is this normal ??

5 REPLIES

Re: Multiple routes with hsrp

The problem here is not with HSRP, but with EIGRP, because you are getting the route to 10.16.0.0 with equal metrics from both the active and standby routers. The behaviour appearing above is normal.

New Member

Re: Multiple routes with hsrp

Thanks

Therefore if I set a delay on my standby router's int fast0/0, that should reduce multiple routes on my msfc.

Re: Multiple routes with hsrp

Yep thats true. If there are not many routes like the above, you can try forcing a static route on the MSFC, with next hop as the virtual router ip address of the HSRP group.

New Member

Re: Multiple routes with hsrp

Thanks. There are a lot of remote sites.

Re: Multiple routes with hsrp

Hi,

Using HSRP and tweaking EIGRP delay on the standby router, does solve the issue of sending outbound traffic from your HQ site to the remote sites via the active router always, until the Active router fails.

But inbound traffic from the remote sites doesnt really always come through the active router's wan link. I guess your remote sites will have dual connections, one each to each of the wan routers (Active and Standby routers). So tweak the bandwidth or delay of the wan link of either the Active or Standby so that the HQ routes will appear with only one next-hop in the routing table, with a feasible successor of Standby router.

Again the above case appears only if you have equal cost links from remote sites to either routers. If you are using high bandwidth link to active router and low bandwidth link to standby router from each remote site , then there is no need to tweak the bandwidth on the wan links.

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