HSRP tracking on Cat.3750

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Jun 25th, 2008
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I am trying to create a HSRP route reachability on a Catalyst 3750 version IP Services 12.2(44)SE2.

The route is present in the routing table but the tracking object is down :

Switch#show track 3

Track 3

IP route reachability

Reachability is Down (no route)

1 change, last change 00:05:32

First-hop interface is unknown

Switch#show IP route

Routing entry for

Known via "ospf 1", distance 110, metric 2, type intra area

Last update from on Port-channel1, 00:20:58 ago

Routing Descriptor Blocks:

*, from, 00:20:58 ago, via Port-channel1

Route metric is 2, traffic share count is 1

Here is the only command I used (and i used on routers):

track 3 ip route reachability

Any ideas ?

Thanks by advance !

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smothuku Wed, 06/25/2008 - 21:49
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Hi ,

Can you paste the config. is learning through port channel . Am i right.



fdubus Wed, 06/25/2008 - 22:37
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Yes i am learning through the Po1. is also the loopback of the ospf adjacent router.

which part of the config do you want me to paste ?

ashok_boin Wed, 06/25/2008 - 22:49
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The config relevant to HSRP.


fdubus Wed, 06/25/2008 - 22:53
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HSRP Config:

interface Vlan4

ip address

ip pim sparse-dense-mode

standby 4 ip

standby 4 timers msec 300 1

standby 4 priority 250

standby 4 preempt delay minimum 60

standby 4 authentication md5 key-string *****

standby 4 track 3 decrement 30


smothuku Wed, 06/25/2008 - 23:02
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Hi ,

Reachability is Down (no route) showing no route means there is no static route on the switch.

Track coomand will be used whenever you have routes configured on the switch or router itself.



ashok_boin Thu, 06/26/2008 - 03:31
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You are wrong, Satish.

Track IP route feature is not limited to static routes. It just needs reachability.

See the following example...

CE-1#sh track 5

Track 5

IP route reachability

Reachability is Up (OSPF)

1 change, last change 00:10:15

First-hop interface is FastEthernet0/0

Tracked by:

HSRP FastEthernet0/1 1


CE-1#sh ip ro

Routing entry for

Known via "ospf 10", distance 110, metric 20, type extern 2, forward metric 1

Last update from on FastEthernet0/0, 00:12:45 ago

Routing Descriptor Blocks:

*, from, 00:12:45 ago, via FastEthernet0/0

Route metric is 20, traffic share count is 1


Coming back to original problem, it's giving first hop interface is unknown eventhough Port-channel is active. Can you please try the same track command (without applying to the interface) with different IP route with via any other interface than Port channel on the same router. Then, check with "sh track" command. If that tracking works fine, then it should some tuning might need to be done for port channel interface. You can try debugging of tracking events with "debug standby events track detail" command.




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