Think OC192 ;->
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Andras Bellak
Sent: Monday, May 21, 2001 10:01 PM
To: [EMAIL PROTECTED]
Subject: RE: How is IS-IS more scalable than OSPF? [7:5207]
Anybody want to guess the amount of bandwidth the updates would take ("my
email is running really slow today....")
andras
-----Original Message-----
From: Chuck Larrieu [mailto:[EMAIL PROTECTED]]
Sent: Monday, May 21, 2001 9:33 PM
To: [EMAIL PROTECTED]
Subject: RE: How is IS-IS more scalable than OSPF? [7:5207]
I rechecked the NANOG archive, and I believe you are correct. It was several
thousand nodes.
As to the number of routers theoretically possible in a RIP domain, you
might be surprised if you were to think through the math.
Take a router. Connect ten routers. Connect ten routers to each of those
ten. You can do this seven times, and the max distance from any router on
the periphery to any other router on the periphery is 15 hops - seven in
and seven out again.
10^7 = 10,000,000
if that center router began with 100 directly connected routers, the number
grows astronomically, and yet the max diameter would remain 15 hops.
the real restraint would be the ability of the router to hold a routing
table that big. Along with the problem of convergence. Even if there were no
network problems ever, I bet that sucker would take forever to converge!
Literally!
Chuck
-----Original Message-----
From: Curtis Call [mailto:[EMAIL PROTECTED]]
Sent: Monday, May 21, 2001 6:38 PM
To: Chuck Larrieu
Cc: [EMAIL PROTECTED]
Subject: RE: How is IS-IS more scalable than OSPF? [7:5207]
>BTW, I have been told by folks who work in really big networks that none of
>the routing protocols scale beyond 4-5K routers. As an interesting aside, a
>few weeks ago on NANOG there was a discussion about the largest RIPv1
>network in existence. It was revealed that until a year or two ago, Xerox
>used RIPv1 and had a few thousand routers running RIPv1 on the network.
I believe that the RIP network you are referring to had a few thousand
nodes, not a few thousand routers. I doubt a few thousand routers could
handle RIPs max 15 hop limitation.
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