[c-nsp] ATM PVC auto-provisioning

[Clayton Zekelman]

On a Cisco 7301 (c7301-is-mz.123-11.T2.bin) we tried auto creation, and found that if you specify a timeout, and you're both creating and destroying PVC's automatically, the PA-A3 card will eventually wedge, and stop passing traffic.

We stil use auto creation on ranges, but with a zero timeout to avoid "PVC Churn" which seems to cause the problem.

interface ATM1/0
 no ip address
 load-interval 30
 atm idle-timeout 0
 no atm ilmi-keepalive
!
interface ATM1/0.24 multipoint
 description WNDSON13H00 DSLAM3
 range wndson13dsl3 pvc 4/32 4/415
  ubr 8000
  encapsulation aal5snap
  create on-demand
  protocol pppoe
 !
!                            


The only reason we use the "on-demand" feature is that our Paradyne DSLAM's skip 12 PVCs for each slot when using the 12 port cards (they reserve 24 PVC's per slot), so this allows us to burn up fewer "active" PVC's - A PA-A3 card can only do 4095 PVC's.



----- Original Message ---------------

Subject: [c-nsp] ATM PVC auto-provisioning
   From: "Brian Lehigh" <brianl at sti.net>
   Date: Mon, 24 Oct 2005 10:49:02 -0700
     To: <cisco-nsp at puck.nether.net>

>Hello all,
>Tomorrow morning I will be deploying a new router to handle our broadband
>aggregation (7206 NPE-G1).  Currently, we create a subinterface for every
>PVC and our configuration is obscenely large.  Additionally, we are always
>fighting with the Telco to get PVC's provisioned correctly (i.e. Telco waits
>until the last minute to create the PVC, etc).  I would like to implement
>PVC auto-creation but would like to hear from the list if there are any
>caveats, performance issues, etc. that I should take into consideration
>before going this route.
> 
>Here's part of the config. that I plan to use:
> 
>-----------------------------------------------------
>virtual-profile if-needed
>virtual-profile virtual-template 1
>vpdn enable
>!
>vpdn-group broadband-00
> accept-dialin
>  protocol pppoe
>  virtual-template 1
> !
>!
>!
>!
>vc-class atm pppoe
>  protocol pppoe
>  encapsulation aal5snap
>  create on-demand
>!
>!
>interface ATM3/0
> description ATM DS3 for DSL
> no ip address
> shutdown
> class-int pppoe
> atm scrambling cell-payload
> no atm ilmi-keepalive
>!
>!
>interface Virtual-Template1
> mtu 1492
> ip unnumbered FastEthernet0/0
> no logging event link-status
> peer default ip address pool atm00pool
> ppp authentication pap
>!
>-----------------------------------------------------
> 
>Does this look like it should work?  Do any of you use this method for PVC
>creation?  Also, what would you recommend for "idle-timeout" values?  I've
>seen "idle-timeout 300 10" used.
>Thanks,
> 
>-Brian
> 
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