[cisco-bba] PPPoE and many virtual-templates (per subif/vlan)

Thu Mar 10 13:52:38 EST 2005

Hi Andy,

The problem is that the "protocol pppoe group" command is not accepted under my fasteth subif.
Any idea why?

Also here is something else i came into...
Could there be a problem (bug ?) with the following config?
Does the class-range command work well with bba-groups?

!==================================================
bba-group pppoe PPPoE-384
  virtual-template 1
!
bba-group pppoe PPPoE-128
  virtual-template 2
!
!
vc-class atm PPPoE-128
   protocol pppoe
   vbr-nrt 128 32
   encapsulation aal5snap
!
vc-class atm PPPoE-384
   protocol pppoe
   ubr 3840
   encapsulation aal5snap
!
interface ATM2/ima1
  no ip address
  ima differential-delay-maximum 75
  atm idle-timeout 1200
  no atm ilmi-keepalive
!
interface ATM2/ima1.1 multipoint
  range PPPoE-1 pvc 8/35 8/36
   class-range PPPoE-384
   protocol pppoe group PPPoE-384
  !
!
interface ATM2/ima1.2 multipoint
  range PPPoE-2 pvc 9/35 9/36
   class-range PPPoE-128
   protocol pppoe group PPPoE-128
  !
!==================================================

It seems that i'm getting continually increased ping times when trying to pass voip traffic over the 
PPPoE-2 pvcs.

Although the actual in/out rate of the virtual-access interface remains constantly at ~ 16kbps (1 
voip channel), the ping times to it are increasing quite fast. So after some secs the va interface 
is unpingable and the voip comes quite (10 secs!) delayed. If i stop the voip call, the pings return 
to normal.

Something like this:

rtt=20
rtt=20
rtt=20
rtt=20
rtt=20
rtt=20 - voip starts
rtt=25
rtt=30
rtt=50
rtt=180 - voip gets delay
rtt=400 - voip gets delay
rtt=800 - voip gets delay
rtt=2000 - voip gets delay
rtt=5000 - voip gets delay
rtt=... - voip gets delay
rtt=... - voip gets delay
............
rtt=... - voip stops
rtt=600
rtt=450
rtt=60
rtt=20
rtt=20

The equivalent PPPoA & 2 pvcs config doesn't have this "side effect".

PS: Router is a 7200 (12.3(11)T2).

Andy Schutz (aschutz) wrote on 8/3/2005 20:06:

> Tassos,
> 
> You create the bba-group outside of the subinterface configuration and then
> under the ethernet subinterface, enter:
> 
> protocol pppoe group <name of bba-group you want>
> 
> The vtemp is referred to in the bba-group.
> 
> That should work.
> 
> Andy
> 
> 
>>-----Original Message-----
>>From: Tassos Chatzithomaoglou [mailto:achatz at forthnet.gr] 
>>Sent: Tuesday, March 08, 2005 11:26 AM
>>To: aschutz at cisco.com
>>Cc: 'cisco-bba'
>>Subject: Re: [cisco-bba] PPPoE and many virtual-templates 
>>(per subif/vlan)
>>
>>Maybe i'm missing something here.
>>
>>I tried all available commands under an ethernet subif, but i 
>>didn't find any option for enabling 
>>different pppoe config (vt) per subif.
>>
>>Andy Schutz (aschutz) wrote on 8/3/2005 19:07:
>>
>>
>>>Yes, it should. 
>>>
>>>
>>>
>>>>-----Original Message-----
>>>>From: Tassos Chatzithomaoglou [mailto:achatz at forthnet.gr] 
>>>>Sent: Tuesday, March 08, 2005 10:57 AM
>>>>To: aschutz at cisco.com
>>>>Cc: 'cisco-bba'
>>>>Subject: Re: [cisco-bba] PPPoE and many virtual-templates 
>>>>(per subif/vlan)
>>>>
>>>>Thanks Andy ;-)
>>>>
>>>>This seems to be exactly what i was looking for.
>>>>
>>>>Do you know if this bba-group setup will work for ethernet 
>>>>subinterfaces too?
>>>>
>>>>Andy Schutz (aschutz) wrote on 8/3/2005 18:15:
>>>>
>>>>
>>>>>Try using bba-groups:
>>>>>
>>>>
>>>>http://www.cisco.com/en/US/partner/products/hw/routers/ps133/p
>>>>roducts_config
>>>>
>>>>
>>>>>uration_guide_chapter09186a0080175167.html#wp1050602
>>>>>
>>>>>Cheers,
>>>>>
>>>>>Andy 
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>-----Original Message-----
>>>>>>From: cisco-bba-bounces at puck.nether.net 
>>>>>>[mailto:cisco-bba-bounces at puck.nether.net] On Behalf Of 
>>>>>>Tassos Chatzithomaoglou
>>>>>>Sent: Tuesday, March 08, 2005 7:22 AM
>>>>>>To: cisco-bba
>>>>>>Subject: [cisco-bba] PPPoE and many virtual-templates (per 
>>>>
>>>>subif/vlan)
>>>>
>>>>
>>>>>>I'm using the following config in order to accept and 
>>>>>>terminate PPPoE connections on a 7200 router.
>>>>>>The 7200 is connected through ATM/ima with a 6015 dslam.
>>>>>>
>>>>>>I'm trying to associate PPPoE users to different 
>>>>>>virtual-templates, based on the atm subif (or maybe 
>>>>>>vlan in the future) on which they are terminated.
>>>>>>
>>>>>>!--------------------------------------------------
>>>>>>vpdn-group PPPoE-USERS
>>>>>>accept-dialin
>>>>>> protocol pppoe
>>>>>> virtual-template 1
>>>>>>!
>>>>>>!
>>>>>>vc-class atm PPPoE-128
>>>>>> protocol pppoe
>>>>>> vbr-nrt 128 32
>>>>>> encapsulation aal5snap
>>>>>>!
>>>>>>vc-class atm PPPoE-384
>>>>>> protocol pppoe
>>>>>> ubr 384
>>>>>> encapsulation aal5snap
>>>>>>!
>>>>>>!
>>>>>>interface ATM2/ima1.1 multipoint
>>>>>>description ** subif 1**
>>>>>>range PPPoE-1 pvc 8/35 8/36
>>>>>> class-range PPPoE-384
>>>>>>!
>>>>>>!
>>>>>>interface ATM2/ima1.2 multipoint
>>>>>>description ** subif 2**
>>>>>>range PPPoE-2 pvc 9/35 9/36
>>>>>> class-range PPPoE-128
>>>>>>!--------------------------------------------------
>>>>>>
>>>>>>When using PPPoE, is there a way i can define another 
>>>>>>virtual-template to be used under the 2nd atm 
>>>>>>subif?
>>>>>>Maybe i have to change the encapsulation from aal5snap to 
>>>>>>something else, but then will it work with 
>>>>>>PPPoE?
>>>>>>
>>>>>>When using pppovlan (PPPoE over vlan) as encapsulation is 
>>>>>>there a way i can configure different vt 
>>>>>>per vlan?
>>>>>>
>>>>>>PS: If i use PPPoA (and aal5mux), i can configure one 
>>>>>>-different- vt under each vc-class, so this 
>>>>>>scenario is working fine.
>>>>>>
>>>>>>
>>>>>>_______________________________________________
>>>>>>cisco-bba mailing list
>>>>>>cisco-bba at puck.nether.net
>>>>>>https://puck.nether.net/mailman/listinfo/cisco-bba
>>>>>>
>>>>>
>>>>>
>>-- 

> 
> 

-- 
***************************************
         Tassos Chatzithomaoglou
Network Design & Development Department
              FORTHnet S.A.
          <achatz at forthnet.gr>
***************************************