thanks for sharing and updating us. Just a few questions if you'd indulge
me, otherwise have a great day.
I'm kind of curious and very clueless since I don't know your network
architecture, but if you have a default gateway set on the AS/400 and IP
routing protocol running in your routers (even if it's static routes), then
unless you're running multiple NICs with multiple paths to the outside, why
would you need so many static routes in the AS/400 IP stack? Why (for
example) would you not have all your IP routing handled the the router
level?
I usually look at static routes on a host as a band-aid because I didn't
configure my network (read routers) properly - makes it hard for me to point
my finger at the clueless sysadmins for eliminting routes that they really
shouldn't need if I have a properly configured infrastructure.
And at the broadcast storm level, do you know why your routers were not
picking those up and routing them for the host? In other words, was ARP
working at the host and router level?
-e-
----- Original Message -----
From: "Sites, Bob"
To:
Sent: Monday, April 30, 2001 5:58 AM
Subject: Excessive Retransmissions UPDATE [7:2553]
> 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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