FEC (Fast Etherchannel) issues
brownkg at earthlink.net
Sat Mar 20 00:28:40 UTC 1999
Although I am by no means the authority on how FEC works, I do understand
the technology at issue.
Cisco's implementation of FEC uses the X-OR (exclusive-OR) algorythm, and
examines the last two bits of the source and destination MAC addresses. In
doing this, there will be one of four possible results ( 01, 00, 11, 10 ).
Each of these possible results are mapped to a bundled link.
In your case, since you say you are doing this between routers, and your
requirement seems to be load balancing between links, then I would suggest
using a layer 3 routing protocol like OSPF that will automatically load
balance between links with the same administrative cost.
Again, I don't consider myself the man with all the answers, but if you are
doing this between routers, then I would most definately keep my load
balancing in the L3 arena, especially when it could be from a
standards-based routing protocol rather than a quasi-proprietary protocol.
My 2 cents,
Sr. Data Systems Engineer
Sprint - BMO - JCMO
## nothing I say is to be considered the position of my employer. so there!
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