Please help with a HSRP design

[Marinache Andrei]

Hi all!

Here is a simplified schematic of my future network setup.

I hope it's self-explanatory; if not, just ask.

Right now routing is done by a virtual Vyatta on ESXi hosts.

We need to change it with 2 x 7301 routers in HSRP mode.

We want to set them up so that in case that one of the 2970 switches or one of the routers goes down, the other router will take it over.

The Gi0/2 ports from both routers will be connected to a 3550 for OOB management, we don't really care about these so we need only gi0/0 and gi0/1 monitored.

I never used HSRP

From what I've read, I have to setup a virtual IP to be used as gateway, but we use about 50 Vlans with different subnets, it wouldn't be nice to setup a virtual IP for all of them - some are /30.

Can you please give me a hint where to start? If you need more details just ask.

Thank you!

[Robert Falconer]

By the looks of your drawing, it looks like you have trunks between your 2970s and 7301s. You'll need to set up a subinterface on the 7301 for each vlan and then apply the necessary HSRP configuration. If you have /30 networks with a single host and a single gateway, you will have to change it if you want to use HSRP. You will have to do this with all 50 vlans if you want to use HSRP.

You'll need to determine if you want to load-share or have all vlans active on a single router. If you load-share, make sure your spanning tree root makes sense.

Here is a basic sample for a single vlan. There are many ways you can tweak it.

7301A:

gig0/0.10

des vlan 10

encapsulation dot1q 10

ip address 192.168.10.2

standby 1 ip 192.168.10.1

standby 1 priority 110

7301B:

gig0/0.10

des vlan 10

encapsulation dot1q 10

ip address 192.168.10.3

standby 1 ip 192.168.10.1

standby 1 priority 105