hi group
i have some strange entries in the arp cache of all our 7200 routers
with "Incomplete" MAC
here an example of "sh arp":
------------------------------------------------------------------------------
Internet 172.16.90.232 0 000c.8323.c5d2 SNAP
TokenRing1/2
Internet 172.16.90.233 0 Incomplete SNAP
Internet 172.16.10.166 0 Incomplete SNAP
Internet 172.16.90.246 0 4005.002d.7160 SNAP
TokenRing1/2
Internet 172.16.10.167 0 0800.09c4.8884 SNAP Fddi0/0
Internet 172.16.100.201 0 0006.0d5c.db9f SNAP
TokenRing1/3
Internet 172.16.90.247 0 0000.8322.1515 SNAP
TokenRing1/2
Internet 172.16.90.244 0 0000.8329.bc8d SNAP
TokenRing1/2
Internet 172.16.100.202 0 0008.c13a.6ba1 SNAP
TokenRing1/3
Internet 172.16.10.164 0 0800.09c4.e844 SNAP Fddi0/0
--------------------------------------------------------------------------
Internet 172.16.80.36 3 0000.8323.88e3 SNAP
TokenRing1/1
Protocol Address Age (min) Hardware Addr Type Interface
Internet 172.16.10.127 3 0000.5a42.6d48 SNAP Fddi0/0
Internet 172.16.20.98 0 Incomplete SNAP
Internet 172.16.10.124 3 0000.5a42.6d48 SNAP Fddi0/0
Internet 172.16.20.99 0 Incomplete SNAP
Internet 172.16.10.125 3 0000.5a42.6d48 SNAP Fddi0/0
Internet 172.16.80.32 3 0000.8327.e9ad SNAP
TokenRing1/1
----------------------------------------------------------------------------
as you can see there is no interface behind and the age remain 0
those ip addresses were/are not in use
all our users have Olicom token ring cards (0000.83) and they are all
patched to Alcatel TR concentrators .... some are connected to Bay TR
switches - but in both cases you can see this strange arp entries
if i clear the arp cache - those entries apper again and they vary
i don't know if it is a problem - i can't see any performance problems
what could this be?
cabling reflections?
any comments are appreciated
thanks in advance
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=4164&t=4164
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