Dear Exchange Point members and operators,
I have a small inquiry today: could you please have a look at the
low-order bit distribution of (Cisco) router MAC addresses at your
exchange point(s) and tell me the result ?
Background: port-grouping algorithms (like Cisco FastEtherChannel on
Cat5xxx) on switches tend to use low-order bits of MAC addresses (XOR of
source/dest, or similar) for load-sharing purposes.
Now it turned out, probably because "Vienna is different", that more
than 90% of all (Cisco) router FastEthernet interfaces connected to the
Vienna Internet eXchange have MAC addresses ending with Hex 0 !!! And
nope, it's not Halloween today (for those who understand German ;-)
This of course does break port-group load-balancing on any such switch
with only routers connected ... :-(
Any ideas, similar experiences, workarounds (other than to assign MAC
addresses to exchange point routers) ?
Kind regards
CP
--- ---------------------------------------------------------------------- ---
--- Christian Panigl : Vienna University Computer Center - ACOnet ---
--- VUCC - ACOnet - VIX : -------------------------------------------- ---
--- Universitaetsstrasse 7 : Mail: Panigl(a)CC.UniVie.ac.at (CP8-RIPE) ---
--- A-1010 Vienna / Austria : Tel: +43 1 4277-14032 (Fax: -9140) ---
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