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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 protected]>
To: "Andrew Brown" <[email protected]>
Cc: <[email protected]>
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
> is
> 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 protected]             * "ah!  i see you have the internet
>  | [email protected] (Andrew Brown)                that goes *ping*!"
>  | [email protected]       * "information is power -- share the wealth."
>  | 
>  | 
> ---
> Reverend Chris Cappuccio