Carry layer 2 ethernet between vlans over an IP network, anyone?

Question

There seem to be many potential ways to carry ethernet frames over an IP network (dlsw, l2tp, l2tpv3, possibly gre) but none of them, as far as I can see, seem to work with vlan interfaces.

Is there a way to carry ethernet between 6500 MSFC blades so as to link vlans across an IP backbone?

Is there a generic way to do this on any layer 3 Cisco device? A bridge group cannot be configured on a GRE tunnel interface it seems.

I would have thought there was a basic and simple way to do this but I cannot find one. Any help would be appreciated.

-- James

James Harris · Accepted Answer

I have tried DLSW+ but it did not do what I wanted. The config for ethernet to ethernet is simple but the routers failed to pass traffic. I suspect that DLSW+ recognises and passes ONLY Netbios and SNA. Notably it was not present in at least some versions of 12.4.

Bod43 · Answer

You should look at the interface command "xconnect".You may want to increase the mtu such thatfull size ethernet packets (1500/1514/1518 dependingon how you count) pass across the link unfragmented.

Bod43 · Answer

This may be all you need. Not sure though.

6500 A# lo1 ip address 10.1.2.1

interface GigabitEthernet1/1 description no ip address xconnect 10.1.1.1 20 encapsulation mpls end

!! Connected to other 6500 by arbitrary IP network.

6500 B# lo1 ip address 10.1.1.1

interface GigabitEthernet1/1 description no ip address xconnect 10.1.2.1 20 encapsulation mpls end

Carry layer 2 ethernet between vlans over an IP network, anyone?

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