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Re: Plethora of UUnet outages and instabilities
From: the Riz <riz () boogers sf ca us>
Date: Tue, 1 Jul 1997 09:11:35 -0700 (PDT)

Brian Behlendorf wrote:
At 09:49 AM 7/1/97 +0200, Hank Nussbacher forwarded from Network World:
UUNET started upgrading the memory on the routers, which Cisco
contends was the real culprit. Cisco recommends that its ISP
customers use 128M bytes of total memory on their route switch
processor boards, Michelet said. UUNET uses 64M-byte memory boards
on most, if not all, of its 7,500 routers.

UUNET said it never received a recommendation from Cisco concerning
memory for its 7,500 routers. ``But clearly, once this event
occurred, we discussed the memory issue with Cisco, and we agreed
the right course of action would be to upgrade the routing memory to
128M bytesÙ,'' said Jim McManus, vice president of systems
engineering at UUNET.

Ouch!  A couple of questions:

1) Is the "7500" the actual number of routers they'll have to upgrade, or
are they referring to the Cisco 7500 product line?  That's an awful lot of
routers to upgrade, so UUnet could have problems for awhile.

2) What could have caused the memory requirements to jump so dramatically?
And if it's due to the routing table "for the whole Internet", why weren't
others affected?  

My guess is it was a memory leak of some sort on Cisco's part;  NETCOM has
run into a few of these lately.  (Thankfully, we caught them before they
got out of hand)  There seem to be a few bugs in IOS that cause severe
memory fragmentation;  we've gotten fixes for *several* bugs of this type
over the last year, on various platforms.  (The latest is one that
fragments I/O memory on 25XX routers;  thankfully, this doesn't affect the


Jeff Rizzo                                         http://boogers.sf.ca.us/~riz

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