On 04/26/2010 10:32 PM, Paul Stewart wrote:
Can someone explain this a bit better for me? ;) Sorry if this is "MPLS
101"...
We are getting ready to deploy some equipment (mixture of Cisco/Juniper)
that is MPLS capable. We'd like to transport some VPLS traffic however in
the middle of a few of the links are layer2 switches - we've been told this
isn't possible even with 1600 MTU frame size supported.... Juniper is
That sounds unlikely; 1600 bytes should be sufficient for VPLS I think.
telling us (in one particular segment) that we must hang MX gear in there to
make it work with MPLS...
Just looking to clarify MPLS type traffic over VLAN layer2 equipment and
works and doesn't work and why.... as you can tell we're fairly new to the
MPLS side of things but hoping to get up to speed soon...
MPLS is basically ethernet packets with a destination mac, ethertype,
some MPLS labels, then the original packet. The MPLS packets will flow
over any ethernet switch provided said switch will support the MTU.
*Terminating* the MPLS LSP is a whole different ballgame, and in
particular you want to be very sure your Cisco gear supports VPLS. The
6500 does not with LAN cards, for example.
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