GLBP cisco 1841 2 interface on same router

[Fotiosmark]

Hi there!!! :)

Basically I am wondering if I can do GLBP with Track between 2 interfaces on the same Router. Both interfaces are L3 on same Subnet. 1.1 and 1.2

So Can I use GLBP between thoese two and create a Virtual IP which will be Load Balance between those 2 interface?

Each interface will be connected to 2 stacked switches for redundancy.

I would do Port Channels instead GLBP, but 1841 doesn't seem to support Port-Channels

Thanks

[mlund · Accepted solution]

Hi

If portchannel is not supported, use IRB instead. Here's a link that explain what it is.

https://www.cisco.com/c/en/us/support/docs/lan-switching/integrated-routing-bridging-irb/17054-741-10.html#irbconfig

/Mikael

[Fotiosmark]

So, I assume, the one router that will be connected to 2 interfaces on stack switches, I can use IRB to bridge these 2 interfaces with 1 ip.
Does it load balance? :)

[mlund · Accepted solution]

Hi

Yes you are correct that two interfaces connect to switch and the ip address on the interface irb will be used as gateway for clients.

But for the load balance, i think that spanning-tree will block one of the 2 interfaces, otherwise there will be a loop on the vlan. So no load balance, but you have redundance.

/Mikael