How many remote sites off each 7500?
Are the remote sites all 'stub' sites?
Do the remotes have connections to both 7500's (ie. primary and backup pvc)?
The passive-interface idea you have is probably a good one.
If your remote sites have a connection to both 7500's, make sure that you
have outbound distribution lists on the remote routers so that the remotes
don't advertise anything but what is behind them.
If your addressing is organized in such a way that you can summarize
everything behind each of the 7500's back into the core RSM's that would
probably also help. This way if a remote link bounces, the 7500 will see
the change and deal with it but the RSM's will not be affected.
Dennis
""Michael L. Williams"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> 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=14590&t=14579
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