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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

On 21 Nov, 12:03, James Harris <james.harri...@googlemail.com> wrote:
> 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.

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.

On 22 Nov, 21:19, James Harris <james.harri...@googlemail.com> wrote:
> On 21 Nov, 12:03, James Harris <james.harri...@googlemail.com> wrote:
>
> > 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.
>
> 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.

You should look at the interface command "xconnect".

You may want to increase the mtu such that
full size ethernet packets (1500/1514/1518 depending
on how you count) pass across the link unfragmented.

On 23 Nov, 10:04, Bo...@hotmail.co.uk wrote:
> On 22 Nov, 21:19, James Harris <james.harri...@googlemail.com> wrote:
>
>
>
>
>
> > On 21 Nov, 12:03, James Harris <james.harri...@googlemail.com> wrote:
>
> > > 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.
>
> > 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.
>
> You should look at the interface command "xconnect".
>
> You may want to increase the mtu such that
> full size ethernet packets (1500/1514/1518 depending
> on how you count) pass across the link unfragmented.- Hide quoted text -
>

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