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Re: router interfaces
- From: Dana Hudes
- Date: Mon Apr 10 23:07:25 2000
Any router with an ATM or Frame Relay interface is going to have lots and lots of sub-interfaces.
In provider-customer connections the usual process is to have a /30 and the interface is operating in point-point VC mode.
I'm sure folks aggregating onto Frame Relay HSSI from a WAN switch are putting more than 50 T1 worth on. I'd hope not since one is paying for that T1 but oversubscribing is the game.
So certainly I would expect to see hundreds of interfaces. I'm not talking about secondary IP addresses.
On an OC-3 ATM -- I can certainly trunk lots of customers to a single BCN with 3 OC-3 interfaces
(dumping that traffic is another problem unless you want Gigabit Ethernet or multiple Fast Ethernet full-duplex)
----- Original Message -----
From: "Chris Cappuccio" <email@example.com>
To: "Andrew Brown" <firstname.lastname@example.org>
Sent: Monday, April 10, 2000 5:43 PM
Subject: Re: router interfaces
> This really depends on what software the router is using and how optimized it
> You can easily have thousands of loopback (or other virtual interfaces) on a
> PC router running a free OS. The performance you will get depends on how the
> OS handles routing tables and interfaces in the kernel!!!
> As far as max next-hop gateways, this should only be limited by the limits of
> the routing table.
> On Mon, 10 Apr 2000, Andrew Brown wrote:
> | while arguing routing with a friend of mine, we got to the point where
> | the number of interfaces on a router was a point of contention. now
> | certainly routing depends not only on the number of interfaces a
> | router has, but also on the number of next-hop gateways it need to
> | keep track of.
> | that said, i'd like to just ask: what's the largest number of
> | interfaces anyone has on any of their routers? i was arguing that
> | high end routes would probably have maybe a few hundred. my friend
> | was arguing in terms of theoretical limits and thought it was more
> | like tens of thousands.
> | max interfaces? max next-hop gateways?
> | thanks.
> | --
> | |-----< "CODE WARRIOR" >-----|
> | email@example.com * "ah! i see you have the internet
> | firstname.lastname@example.org (Andrew Brown) that goes *ping*!"
> | email@example.com * "information is power -- share the wealth."
> Reverend Chris Cappuccio