actually the MPLS label space is only one for each node.
MPLS labels can be picked up by different signalling protocols from this single space and then advertised to peers in the appropriate sessions
in the case of EoMPLS pseudowire these labels are picked up and advertised by LDP over targeted LDP sessions
in the case of L3 MPLS VPN, MP BGP picks up one (or multiple ) labels per VRF site and will advertise them over VPNv4 address family to peers
All devices have to agree on the use of these service labels.
So when sending traffic to a specific PE node (external label pointing to device loopback) the internal service label is unique on that node and can be associated to an MPLS L3 VPN or to a pseudowire but not to both at the same time
>> Perhaps, you are used to write: MPLS (modified hop-to-hop) over PW. Thus the client is below, crushed under all the layers. But, the result is same.
No, it is not the same.
I like to use the way the real encapsulation as it is on wire, and I personally don't like the other notation, there is a label stack and the inner label is that of the service and the external label in the encapsulation are usually created by different signalling protocols
If you make a packet capture you see the difference
A lot of presentations calls the external label in the encapsulation internal because it comes from an IGP
>> Perhaps, talking with you, I have an explanation for the difference between PW label and MPLS label for the route (the most iternal label).
I hope so
There are many RFCs on the subject.
I think everyone agrees on the fact that pseudowire is related to L2 transport services
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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