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ospf on rsfc

Hi all.

I have two catalyst 6500 and two 5500 all with rsfc running ospf.

When I perform some show ip route command for the same destination network from a 6500 rsfc, I see that the preferred gateway for that network changes everytime.

As you can see below the star, that indicates the preferred way, first points to N.N.N.A and then points to N.N.N.B.

(N.N.N.A and N.N.N.B are the two ip addresses of two 5500 rsfc that speak ospf)

6500rscf>sh ip route 172.20.3.0

Routing entry for 172.20.3.0/24

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

Last update from N.N.N.A on Vlan2, 00:14:14 ago

Routing Descriptor Blocks:

* N.N.N.A, from X.X.X.X, 00:14:14 ago, via Vlan30

Route metric is 20, traffic share count is 1

N.N.N.B, from Y.Y.Y.Y, 00:14:14 ago, via Vlan30

6500rscf>sh ip route 172.20.3.0

Routing entry for 172.20.3.0/24

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

Last update from N.N.N.A on Vlan2, 00:14:14 ago

Routing Descriptor Blocks:

N.N.N.A, from X.X.X.X, 00:14:14 ago, via Vlan30

Route metric is 20, traffic share count is 1

* N.N.N.B, from Y.Y.Y.Y, 00:14:14 ago, via Vlan30

Note that rsfc with N.N.N.A ip on its interface has a lower cost

Any suggestion

Thank you all.

Carlo

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Re: ospf on rsfc

I don't see the metric on the second route? If they are equal cost routes, I would expect the star on the best path to change every time a packet is process switched through the box, to account for per packet load sharing.

Russ.W

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