Gateway of Last Resort with OSPF and two Core Switches

[simoesmarco8626982]

Hi all,

Hope to find everyone well.

I'm having an issue that today consumed a few hours of time but I wasn't able to put it to work and I was hopeful to get help from you guys.

I have a network configured as a ring, where in the receiving location I have two core switches working with HSRP, if one fails the other one takes over. In this location I have an edge router for internet access connected to CSW1, and CSW1 has a static route configured and OSPF is propagating this default route to all the switches including CSW2. 

Now I asked to do the following and besides having the router connected to CSW1 I have to have the router connected to CSW2. I configured a VLAN and propagated it between the two switchs and configured HSRP on them, my issue is OSPF allows only one default route of one switch to be propagated and that doesn't work for me.

I need that in case CSW1 fails, that CSW2 picks up the slack and propagates the static route to all the other switches automatically and if CSW1 comes back that becomes the master, but I tried everything and OSPF was not having it and I had loads of issues. In the end had to revert everything to how it was, this being having the router connected only to one switch.

Is there any way of putting this work in this kind of configuration using ospf?

Thank you

[Georg Pauwen]

Hello,

please provide a schematic drawing of your topology showing how your devices are connected.

[paul driver · Accepted solution]

Hello

It sounds like both rtr needs to default-information originate if so set the primary to advertise with a metric-type 1 and leave secondary as metric type 2

This way if primary fails the secondary default will be advertised:

Example- primary rtr:
default-information originate metric-type1

[simoesmarco8626982]

Thank you all once again!

All sorted