Hey all...... kind of a silly question, but how does EIGRP handle updates
when there are multiple links between two routers......?
Here is the scenario I've got:
I have two 5500s connected via etherchannel trunks and a 7500 hanging off
each one for WAN connections like so
WAN -- 7500 --FastEther--5500 --Etherchannel Trunk -- 5500 -- FastEther --
7500 -- WAN
(careful of wrap)
FYI: The 7500s connect to their respective 5500 via FastEther that is in
VLAN 1 (no flames!)
Every once in a while an EIGRP update comes in from the WAN, and all of a
sudden the two 5500's get "hung" in an EIGRP storm... I did a sniffer
capture (only in the VLAN I was connected to) and there were over 4,000
EIGRP updates from the two 5500's in 6 seconds..... (all for the same route
that was passed to them from the WAN by one of the 7500's). CPU goes from
~5% to 30% when this happens and the only way to stop it is to "clear ip
eigrp neighbors". Once this command is issued, it's all over..... things go
back to normal (until it happens again)......
My question is this. Since both RSMs on the 5500s see the same VLAN
interfaces (since all of the VLANS are trunked between the two switches),
they effectivly have 12 (# of VLANs) connections to each other. Could this
be causing this "storm" of EIGRP updates?
I was under the impression that the RSMs would see each other as a single
EIGRP neighbor. I've considered taking all VLAN interfaces (in both RSMs)
except VLAN 1 (which connect to the 7500s) and making them passive
interfaces.....
Any input here? I don't have a *clue* what could be causing this EIGRP
storm...... I can't say 100%, but I don't think the two 7500s are affected
by this storm.....
TIA,
Mike W.
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=14579&t=14579
--------------------------------------------------
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
