Hi, 2009/4/28 Saqib Ilyas <msaqib@gmail.com>:
Hello everyone In the context of a single service provider network running MPLS, if a number of bandwidth constrained LSPs are passing through a particular node and the sum of the bandwidth constraints for the LSPs is X Mb/s, then is X the upper bound on the traffic through that node, or is it sometimes exceeded as well?
From my experience with RSVP-TE and LSP tunnels the bandwidth you pin down for a tunnel is only reserved, not guaranteed. There is nothing stopping you from creating a 10Mb/s LSP and sending 20Mb/s down through it. By default only the ingress LSR can do the policing/shaping. If you don't to that at the head than the rest of the network will just happily pass the traffic defaulting to its normal queue handling. So to answer to your question is - yes you might see more traffic then you've reserved.
kind regards Pshem