July 2002
Intermediate to advanced
608 pages
14h 52m
English
Content preview from Traffic Engineering with MPLS
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Tunnel Reoptimization
What happens if, while a tunnel is up, a path appears that is a new best path from head to tail? Consider the network shown in Figure 4-7.
Figure 4-7. New Path Is a More Optimal TE Tunnel Candidate
In Figure 4-7:
All links start with 100-Mbps reservable bandwidth.
Router A and Router D both want to build 60-Mbps tunnels to Router H.
The link between Router D and Router H is down.
Assume that the following sequence of events happens:
Router D builds a tunnel D→C→H.
Router A builds a tunnel A→B→C→E→F→G→H.
Router D reduces its D→C→H bandwidth reservation to 30 Mbps, either by configuration or because of something like auto bandwidth ...
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