01-01-2002 05:32 AM - edited 03-01-2019 07:53 PM
Hi There,
If I apply access-lists to interfaces on a 3600 router, am I essentially turning off fast switching off for those interfaces as all packets have to be checked for matches or do access-list make no difference at all to fast switching. Also, how does priority queuing affect fast switching as it rearranges the order of packets.
Any advice appreciated
Karl Jones
01-02-2002 11:05 AM
Hello Karl,
Check out this link on switching. You want to look at netflow for combining access lists and maintaining some fast switching functionality:
I hope someone else can answer the part of your question about priority queuing. I think that switching decisions and queuing decisions are apples and oranges but I can't say for sure.
01-04-2002 04:46 AM
Thanks Scott,
I will check out that link,
Happy New Year
01-04-2002 08:04 AM
If im right, it doesn't affect fast switching at all. I know ACLs cannot be used with CEF switching unless in conjunction with a policy. The good thing is it would not instantly divert to process switching, it would drop to each previous switching successor in terms of speed. Not all packets would be process-switched anyway because the "stream characteristics", e.g. src/dest/port, etc. would be cached preventing the need for every packet from each stream being compared to the ACL.
Hope this helps,
Neil Moss.
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