Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!bloom-beacon!bu-cs!kwe
From: kwe@bu-cs.BU.EDU (kwe@bu-it.bu.edu (Kent W. England))
Newsgroups: comp.protocols.tcp-ip
Subject: Re: flooded with routing updates?
Summary: Sure, if you have multiple external gateways
Message-ID: <23691@bu-cs.BU.EDU>
Date: 7 Jul 88 17:52:35 GMT
References: <471@apctrc.UUCP>
Reply-To: kwe@buit13.bu.edu (Kent England)
Followup-To: comp.protocols.tcp-ip
Organization: Boston Univ. Information Tech. Dept.
Lines: 26

In article <471@apctrc.UUCP> zgel05@apctrc.UUCP (George E. Lehmann) writes:
>Tulsa, Oklahoma
>
>Has anyone else had problems with excessive routes showing up at their site?
>On three occassions in the past thirty hours we have suddenly discovered
>500-700 internet addresses in our Sun's route tables.
>-- 
>George Lehmann,  ...!uunet!apctrc!zgel05

	One way to get lots of routes showing up in a host is to be on
an Ethernet with several gateways that are connected to different
regional or backbone networks.  If you want to do robust routing, your
host needs a route to each reachable net and that number is getting
pretty large today.

	We have a jvnc-net router and an arpa-net router and we have
hundreds of routes advertised by our jvnc-net router on a local
Ethernet that has a few hosts on it (soon to be moved).  Our arpa-net
router is quiet, but the default, so we save advertising all the
arpa-net routes.  There is only one subnet with the external gateways
on it, so there are only three routers that must keep these huge
tables.  Everyone else on campus can default to a router that is on
that subnet.


	Kent England, Boston University