Tag: MPLS
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Ultimate Hop Popping & QoS
The default behaviour for MPLS routers is Penultimate Hop Popping. The last hop router generates the implicit null to indicate that the penultimate router should pop the label. However, if the network is configured for QoS based on MPLS EXP bits, then QoS is lost between penultimate router and last hop router. Therefore, in this…
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DSCP Tunnelling Methods over MPLS
There are commonly defined 3 types of DiffServ tunnelling methods over MPLS: the Pipe Model, Short Pipe Model and Uniform Model (QoS for IP MPLS Networks, Santiago Alvarez 2006). The Pipe model ensure that there are no changes to the DSCP marking through the Label Switched Path (LSP) – even if a Provider router remarks…
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