Just wanted to update the list on this matter because I feel that it could
very easily happen to anyone of you and it was very difficult to locate the
problem. Got to blame this one on Big Blue hardware. Yes, the AS400 was the
cause of all our problems here, once again. Apparently several days prior to
this problem, the AS400 was upgraded and a rollover software called Visions
was added. This is similar in function to HSRP. A third party software that
allows rollover from one AS400 to another. Anyway, during the setup for the
rollover testing it was recommended that some static routes in the AS400 be
cleaned up and deleted. Way to go Visions! Our AS400 folks didn't know any
better and just deleted static routes down from about a dozen to 4!!! Our
symptoms were major broadcast storms of retransmissions. Got to keep a close
eye on those big blue boys! Of course, as always, it was a "network" problem
and the network team solved it!!! Is it at all possible that IBM could come
up with a more worthless IP stack?
Bob Sites, CCNA
Winchester Medical Center
Do you have a TACAC's, Syslog server, & or SNMP database server. Helps you
find the who, what, where, & when things started. Sometimes you gotta dig
backwards when the obvious just won't present itself. My guess is that you
have a link down, a flapping interface, or had bounce on a link that the
protocol wasn't configured to handle.
Please keep us posted with your success or failures
Phil
Perhaps someone could steer me on this problem that I've been fighting for
a day and half now. We are having a severe slowdown on our network and when
looking at the IP traffic from just about anywhere to anywhere, about 1/3
of the packets are being retransmitted? Sniffer error is "excessive
retransmissions." Spent about 3 hours on the phone this morning with the
TAC and didn't really get anywhere. It appears that we are having a
broadcast storm of the retransmissions. Any insight into what direction
to head would be greatly appreciated. Would like to isolate the problem by
blades on the switches or routers, but being a hospital this is almost
impossible. We have 2 core 6509's with duplicate sups and msfc's. Main
router is a 7200.
Bob Sites, CCNA
Winchester Medical Center
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