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New Member

3845 high availability

I have 2 x 3845 router/switches that I have OSPF running on.

I want to be able to have layer3 and layer2 (since I have dual card hosts) in an Active/Standby HA. I setup HSRP but it does not provide L2 redundancy.

Ideally I would like it to operate like ESRP in Extreme switches; where if any port on the L2 or any L3 loses a link then the entire switch fails over to the standby.

Can someone provide me a sample config?

Also should I trunk the 2 switches?



Re: 3845 high availability


the layer 3 redundancy can be achieved by the use of HSRP,VRRP,GLBP .

the layer 2 redundancy can be achieved only by STP.

yes u can do configure a trunk between your device the port serving for the connection must be a switched mode not a routed ones, use switchport command for that purpose.


do rate if so

New Member

Re: 3845 high availability

Thanks for the reply.

There is no other mechanism in Cisco to do this?

Also do you have a sample config?

I would like it to be an active/standby not active/active.

Also how do I link the L2 ports to the HSRP? Basically if I lose a link on port 1 on switch one I would like everything (including HSRP) to fail over to the other switch.