The MPLS WG Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Decreasing TE-LSP bandwidth, "interoperability issue" (fwd)
There were actually two reasons for the design choice of changing the
LSP-ID.
The first was already described by Eric -
> Here we have a trade-off between a small potential for
> simplification represented by using a symmetrical approach
> (the same approach used for increasing or decreasing the
> TE-LSP bandwidth)
The other has to do with optimizing bandwidth across multiple parallel
links. If the ERO is node specific but not link specific, then the
choice of which link to place a tunnel on is a local decision. One
option for doing this is to pack tunnels on links where they fit so as
to leave as large a free block of bandwidth as possible in
anticipation of being able to handle a large request.
When you decrease bandwidth, it the tunnel will now fit on one of the
other links, allowing a large free pool, thenyou may want to move it.
Changing the LSP-ID allows this in the same way as nay
make-before-break.
...George
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George Swallow Cisco Systems (978) 497-8143
250 Apollo Drive
Chelmsford, Ma 01824
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