Implementing MPLS QoS for Layer 2 VPN Implementations
As mentioned in earlier chapters, SPs are beginning to use the same IP backbone to provide both Layer 3 as well as Layer 2 VPN services, meaning the usage of AToM, VPWS, VPLS, or L2TPv3 to implement Layer 2 VPN architectures. The procedure to incorporate QoS into each of these Layer 2 VPN implementations is briefly discussed here.
Implementing QoS with AToM
In the implementation of AToM, the emulated circuits use three layers of encapsulation:
Tunnel header— Cisco implements this as the MPLS label or LSP label, which is learned via LDP inside the provider backbone. This is the first label in the MPLS label stack. The label is implemented so that the PDU can be transported from the ingress ...
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