[c-nsp] 7206 VXR L2TP Termination

[Nick Shah]

Alex

Cisco recommends around 12-16K sessions on a NPE-G1 or 7301 (NPE-G1). We
run a very large wholesale DSL network, and I have seen that these
points do have a large impact on how many sessions you can terminate (or
multihop).

- Fragmentation 
- terminating sessions vs. multihop sessions
- Usage (avg. DSL usage in Australia is around 15-20Kbits per sec)

Remember multihop sessions count as 2 x session. The ingress session
from LAC, and the forwarding session to the eventual LNS/HGW. So, in a
pure multihop scenario (all sessions multihop), running avg. throughput
of 15K, I have seen the G1 supporting 6K sessions (12K if terminating
all sessions directly) at 42% CPU. There is a fair bit of fragmentation
though.

A NPE-400 would do roughly half of it (if less fragmentation, you may be
able to go upto 7K)

NPE-300 is EOL, so I wont recommend using it. 

Also, have a look at 7301 (G1), it runs the same processor as a 7206VXR
G1, and comes with 3 x GIG ports with 1 expansion slot.

Rgds

Nick

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Alex - Xifos Ltd
Sent: Monday, 25 October 2004 1:41 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] 7206 VXR L2TP Termination


Hi,

 

This is my first post so be gentle!

 

We are looking to purchase a 7206VXR to terminate L2TP. This will be
used for terminating ADSL connections over L2TP. Hope you gather my
gist.

 

Roughly how many subscribers could we terminate on the following NPE's

 

NPE-300

NPE-400

NPE-G2 

 

Many Thanks,

 

Alexander Fossa

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