Re: [nsp] IP throughput over ATM link

From: Simon Leinen (simon@limmat.switch.ch)
Date: Mon Feb 12 2001 - 05:13:31 EST


Kostas,

> Does anyone know what is the IP throughput
> over an ATM VC with 80179 cps CBR capacity?
> Normaly I would expect this to be
> 80179cps X 48 bytes per cell X 8 = 30788736 bps.
> So we have made the following config:
> atm pvc 1 4 53 aal5snap 30789 30789

You must configure the PVC based on ATM-layer speed, e.g.

80179*53*8/1000 = 33995.896, so

 atm pvc 1 4 53 aal5snap 33995 33995

Note also that you can get slightly better throughput by using IP-only
encapsulation:

 atm pvc 1 4 53 aal5mux ip 33995 33995

(this means that you can only transport IPv4 over this particular PVC,
so no IS-IS (OSPF works fine), no IPX, no IPv6 etc.)

-- 
Simon.



This archive was generated by hypermail 2b29 : Sun Aug 04 2002 - 04:12:28 EDT