November 2006
Beginner
672 pages
15h 30m
English
Content preview from MPLS Fundamentals
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Recoloring the Packet
The MPLS network can encounter congestion, so the operator might want to recolor some packets. This recoloring means the router configuration is used to change the LSP DiffServ information of the packet on any LSR. In effect, the top label gets a new value for the EXP bits. This is allowed, but make sure that this change in QoS is propagated when a label is popped off. A label is popped off when using implicit NULL for PHP. PHP does not happen only at the egress LSR of the MPLS network. A label can also be popped at the tail LSR of a TE tunnel, which is not necessarily the egress LSR of the MPLS network. In the case of popping a label at an LSR, you can configure qos-group to propagate the QoS information. You need to do ...
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