Routing Between Procurve 8212 and HP 5830

[aali]

I have a Procurve 8212 switch running as a core swith with inter vlan routing.  We are in process of moving our data center to colo where we purchased HP 5830 switch.

We have an Ethernet link between the main office (8212) and colo facility (5830).  We will be extending VLANs from 8212 to 5830 swtich and the goal would be not to configure inter vlan  routing on colo swtich 5830.  The routing will be performed by 8212 switch.

In case if the Layer II ethernet link goes down, we want VLANs on 5830 swtich to be able to route locally between the VLANs.

Is this possible?  One solution would beto  configure inter vlan interfaces on 5830 swtich and assign the ip addresses  on these vlan interfaces from the same subnet.  Not sure if this the right method

Other solution I  can thinkg of is to enable VRRP between 8212 and 5830.  They both are connected on a layer II trunk link.  Assign high priority to 8212 so it will always act as primary and if the link goes down between the sites, the 5830 will stop receving hello messages and become available for local routing.

[Vince_Whirlwind]

VRRP would be the way to go.

[Peter_Debruyne]

Hi,

You will have to use intervlan routing on the 5830 as well.

The vrrp method would be the most straight-forward (simple) option.

Configuring the same IP would not work in a transparant way, since the host arp caches would be unpredictable switch1 or switch2 mac, so a failed gw (due to link failure) would take a long time for the host to detect.

Keep in mind that all intra colo routing would be passing the L2 link in that case.

Another trick would be to use 2 vrrp ips per vlan, and configure (or leave) the site-local systems with vrrp vip 1 and the colo servers with vrrp vip 2 to provide local routing.

This would be similar to configuring each router with its own dedicated vlan interface IP and setting this as the GW on the hosts.No redundancy on the GW address, but with a single L2 link that would not matter either ...

Make sure all vlans are known to both switches or configure some routing protocol (ospf/static) between them so all subnet are reachable to both routers.

Best regards,Peter.