[c-nsp] 7206VXR for DSL Termination

[Denny Reiter]

On Fri, Dec 02, 2005 at 10:09:42AM -0600, J Springer wrote:
> We would like to convert our DSL from a Redback to a 7206VXR NPE400,
> 512M memory unit.
> 
> Some questions/concerns that came up were:
> 
> 1) number of VCs that this box could realistically handle

I have a 7206VXR with an NPE-G1 and 256M running 5400 VCs over two
OC3s, with about 2400-2500 active at any one time.

> 2) preference of which OC3 ATM card in the 7206

PA-A3 works just fine for me

> 3) feedback from anyone that has an OC3 card in a 7206 connected to an
> AFC Telliant switch

nope, sorry.

> 4) preference of config (i.e. auto build pvcs vs static config) when the
> DHCP requests will be relayed to a DHCP server for IP address
> assignment.  There will be no authentication.  Current Redback config is
> bridged-1483 with each PVC restricted to its own bridged space (secure ARP).

! Save the dynamic routes in case of crash or reload
ip dhcp database tftp://x.x.x.x/adslroutes
ip dhcp relay information option
!
rbe nasip GigabitEthernet0/1
!
vc-class atm classADSL
  ubr 3300
  encapsulation aal5snap
!
interface ATM1/0.20101 point-to-point
 ip unnumbered Loopback1
 ip helper-address x.x.x.x
 no ip mroute-cache
 atm route-bridged ip
 range LACN1 pvc 20/101 20/212
  class-range classADSL
 !
!

Ranges will significantly cut down on the size of your config.  You
can specify different vc-classes using pvc-in-range, but like Roger
said, static IPs won't work.  We either put them in a separate VC
outside the range or assign the static via DHCP.


> 5) preferred IOS?  any additional licensing costs?

12.3T works well.  This box is actually running 12.4(1a).  12.2(15)T5
seemed to work well, also.

> 6) anything else we've missed?

Absolutely do no try to do NAT on the same box, it will only lead to
pain.

-- 
Denny Reiter                                  denny at reiters.org
               I believe the technical term is "Oops!"