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Posted by HCE on September 10, 2006, 10:32 pm
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The Scenario:
Two 6500's. Three of the gig links between them configured as a port
channel. All three are trunks. CatOS (grrrr...)
The issue
Users start complaining. I isolate the problem to this pair of cats
and take a look. CPU at 100... interfaces dropping millions of
packets...I look at the logs... HSRP is reporting dup addresses on a
gob of segments.... lots of them... as many as you might find, say,
on a trunk. Says I to myself: "I've got a loop between those cats."
Upon investigation I find that *all three* of the links in the port
channel are unidirectional. There we go. I move the channel to three
different ports, different gbics, different fiber, blah blah... happy
network, happy users,
The question?
huh?
I may be as thick as Randy Bushs' wallet, and I've been away from the
catOS for some time, and I've never seen the like on a native, but I
don't quite get this. It's highly improbable that all three of these
interfaces (on three different line cards) went into this state. Could
one single interface in UD mode cause the entire channel to do that?
Bear in mind that I didn't just assume each of these links was UD, I
saw all three in that state from the cons.
Anyone have a clue for me?
ps: I know, I know, udld.... only been on the job two months and I
began my criticisms in the core. :)
p.p.s: by the way... hi everybody. :)
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