November 2006
Beginner
672 pages
15h 30m
English
Content preview from MPLS Fundamentals
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MPLS LSP Traceroute
The goal of traceroute is to test the path, whereas the goal of ping is to test the connectivity. The goal of MPLS LSP traceroute is to test the path of the LSP and verify the control and data plane on every LSR along the path of the LSP.
An MPLS LSP traceroute is nothing more than an MPLS echo request. The difference with MPLS LSP ping is that MPLS LSP traceroute sends several MPLS echo request packets with increasing MPLS TTL. The first MPLS LSP traceroute probe has MPLS TTL 1, and for every subsequent probe, the TTL is increased by 1. One additional TLV that is included with the echo request for MPLS LSP traceroute is the Downstream Mapping TLV. If an LSR receives the MPLS echo request with TTL 1, it replies to it. If ...
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