[c-nsp] Mixed PPPoA and RBE on 6400, with pvc ranges

[James Hampton]

On Tue, 14 Sep 2004 10:07:55 -0600, Robert Tarrall
<tarrall at xxxx.neighborhoodlink.com> wrote:
> 
> Here's the situation: we're a Qwest DSL host ISP moving from a
> multiple-T1 setup on a Cisco 3620 to one DS-3 on a 6400.  We have mostly
> PPPoA customers with a few bridged (RBE), one customer per PVC.
> 
> On the 3620, I've got a single multipoint interface for each T1 that
> handles all the PPPoA customers; I have to manually list each PVC
> (annoying) although using class-int means they can at least pick up a
> default config.  Bridged customers each have their own point-to-point
> interface.
> 
> On the 6400, I'd like to use pvc ranges ("range foo pvc 1/32 1/1032")
> to avoid manually listing each PVC under the multipoint interface.

We have a similar set up but we are mixing PPPoE and RBE, I chose to
individually list each pvc under the sub interface because with one
range every pvc gets the same ubr rate (class-vc) no matter what they
are previsioned for, I wanted 1.5 customers to have ubr 1536 and 768
customers to have ubr 768. I'm not entirely sure this has a big effect
(I'm sort of new to ATM) but it made since at the time.

> However, mixing in some bridged customers appears to break that trick.
> I don't think we can mix RBE and PPPoA in the same range - correct?

Yes, This is another reason why I didn't use a pcv range. 

> 
> Only alternative I can think of is to get Qwest to manually assign
> bridged customers to PVCs outside the range we use for PPPoA - maybe
> use a VPI of 1 for the PPPoA customers and a VPI of 2 for RBE folks.

This should work. 
In my case we are using our own dslams so having non sequential
pvc-to-dslam port mappings would be messy.
> 
> Am I missing any better way of doing this?
> 
> Config snippets for reference:
> ============================================================================
> Cisco 6400 NSP config:
> 
> interface ATM7/0/0
> no ip address
> no atm ilmi-keepalive
> ! For PPPoA
> atm pvp 1  interface  ATM1/0/0 1
> ! For bridged
> atm pvp 2  interface  ATM1/0/0 2
> 
> ============================================================================
> Cisco 6400 NRP config:
> 
> vc-class atm ppp-default
>  encapsulation aal5mux ppp Virtual-Template1
> !
> interface Virtual-Template1
> ip unnumbered Ethernet0/0
> peer default ip address pool DYNAMIC
> ppp authentication pap DSL_USER
> ppp authorization DSL_USER
> !
> ! 1000 PPPoA customers
> interface ATM0/0/0.900 multipoint
> no ip route-cache
> range default-pppoa pvc 1/32 1/1032
>  class-range pppoa-default
> !
> ! 50 RBE customers
> interface ATM0/0/0.200 point-to-point
> ip unnumbered Loopback254
> no ip route-cache
> atm route-bridged ip
> range default-rbe pvc 2/32 2/82
>  encapsulation aal5snap
> !
> ============================================================================
> 
>                       -Robert Tarrall.-
>                       Unix System/Network Admin
>                       E.Central/Neighborhood Link
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