Ole Troan wrote:
[...]
The biggest hit is actually in the forwarding. Each packet
gets at least one additional table lookup (for the incoming
zone id). Then there are the checks to ensure that the source
address is valid (e.g. a site-local SA and global DA trying
to cross a site border).
you have to do the outgoing check for link-locals anyway.
Right, but the check for LL in the SA does not require
retrieving a zone id that has to be used in the forwarding
decision.
The extra cost? Performance drops around 25-30% for a SBR
between 3 sites. Of course, this was all software based,
but even a hardware-based solution will take the extra lookup
hits.
I don't see a performance drop in our implementation. an additional
table lookup is not needed for forwarding. you need to figure out the
scope of the DA of course, but that is needed for link-local/multicast
anyway.
What protocol is your implementation of SL routing utilizing?
How many sites are configured on the router?
Brian
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