[c-nsp] Tunneling VLANs?

[Bruce Pinsky]

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Rick Ernst wrote:
> Is there an IOS/CatOS method to basically tunnel a VLAN trunk across a
> Layer-3 boundary?
> 
> I have a 5500 with multiple VLANs connected to local RSMs.  The RSMs max
> out at 128MB, so I eBGP multi-hop some BGP connections to a 7513.  I'm
> thinking about extending the 5500 VLANs through a trunk port into the
> upstream switch and back "down" into the 7513. This would simplify the BGP
> configuration (at the expense of a tunnel configuraiton).
> 
> This requires multiple VLANs on the intervening switch which takes away
> from limited number of VLANs available and has the possiblity of VLAN-ID
> collisions.  If I could encapsulate the dot1q trunk within IP, I think
> that would solve my problem.
> 
> My Google/CCO-foo appears to be weak; the only thing I've found that looks
> interesting is L2TP, but it doesn't appear to support multiple VLANs.
> 

L2TPv3

http://www.cisco.com/en/US/netsol/ns341/ns396/ns172/ns155/netqa09186a008009d4ea.html

Ethernet over L2TPv3

Q. What are the main applications of Ethernet over L2TPv3?

A.
    * Ethernet Trunking: enables user to take all of the Ethernet on an
associated interface and tunnel it across an IP core to a remote destination.
    * Per-VLAN Tunneling: enables the tunneling of individual VLANs. This
method offers the granularity of controlling which of the traffic is
tunneled to a given destination.
    * VLAN Trunking: similar to Ethernet trunking, all VLANs that are
associated with an 802.1q-based interface are passed across the L2TPv3
Tunnel. This is useful in trunking applications between Ethernet Switches.



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bep

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