North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Plethora of UUnet outages and instabilities
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 bytesU`,'' 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 core) +j -- Jeff Rizzo http://boogers.sf.ca.us/~riz
|