Re: [nsp] Good IOS for 2620 with NM-4T1-IMA PPPoE / ATM

From: Pete Templin (templin@urdirect.net)
Date: Fri Apr 05 2002 - 09:43:52 EST

On Thu, 4 Apr 2002, Brian wrote:

> Great. So your saying to get PPPoE with ATM support on my NM-4T-IMA I
> need to be using a 3640 probably.
>
> Assuming I get a 3640 for the job, is the code good enough for production
> you would say? This is a new dsl setup for a client and would probably
> only amount to 100 or so dsl connections max. I want to use radius and
> pppoe to make a nice clean "dialup like" setup.

> > On Thu, 4 Apr 2002, Brian wrote:
> >
> > > I am going to be using a Cisco 2620 with a NM-4T1-IMA to terminate
> > > some DSL. It will be using PPPoE and ATM. Can someone recommend
> > > a IOS version that has been working for them in this capacity?

I'm using 12.1.2 on a 2620 at the moment, until I get my 16MB flash loaded
with something a little newer that does ATM RBE, and it's working fine for
us.

We're running as follows:
An appropriately sized subnet out of 172.16/12 per customer.
Selective NAT (i.e. only traffic leaving our network) on this 2620.
IRB, which does piss away a lot of config space with a separate BVI for
each customer.
CAR on each BVI limiting outbound ping, and prioritizing the first 96kbps
in/out for each customer.
Note: I am NOT using PPPoE, so I can't speak directly to that.
Note: I am NOT running IMA yet. I'm working on a single ATM T1.

I have had to compress the config recently, but I'm working on putting the
config on a diet to get away from that. Once I switch to RBE, I should be
well under weight.

Sample config:

!
ip dhcp pool tomthomas
   network 172.16.33.8 255.255.255.252
   default-router 172.16.33.10
   dns-server 192.168.254.1 192.168.254.2
   domain-name urdirect.net
!
interface ATM1/0
 no ip address
 no atm ilmi-keepalive
 no scrambling-payload
!
interface ATM1/0.15 point-to-point
 description tomthomas
 no ip proxy-arp
 pvc tomthomas 3/34
  oam-pvc manage 60
  encapsulation aal5snap
 !
 bridge-group 15
 bridge-group 15 spanning-disabled
!
interface BVI15
 description tomthomas
 mtu 1514
 ip address 172.16.33.10 255.255.255.252
 ip access-group 181 in
 no ip proxy-arp
 ip nat inside
 rate-limit input 96000 8000 8000 conform-action transmit exceed-action set-prec-transmit 2
 rate-limit output 96000 8000 8000 conform-action transmit exceed-action set-prec-transmit 2
 rate-limit output access-group 161 8000 8000 8000 conform-action transmit exceed-action drop
!
bridge 15 protocol ieee
 bridge 15 route ip
!

Pete 

--
Peter J. Templin, Jr., CCNP, CCDP
Networking Consultant

On-Line Internet Services - URDirect.net
A division of Global On-Line Computers
5606 Randolph Blvd		templin@urdirect.net
San Antonio, TX 78233		(210)477-7603

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