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

Thu Mar 17 07:29:04 EST 2005

Andy Schutz (aschutz) wrote on 10/3/2005 21:21:

> Tassos,
> 
> Not sure why you are incurring the delay increases, is this on the vbr-nrt
> or the ubr pvc or both?  If you don't see this on oA over the same VC, I
> would agree, sounds like some sort of bug.
> 

I did some more tests and i found that this happened only when the PPPoE config was combined with 
specific (low?) vbr-nrt values; PCR/SCR was 128/32.
When we changed the PCR/SCR parameters to 64/64 the PPPoE config worked fine.
The PPPoE config worked also fine when we used 128/32 as PCR/SCR plus increasing the MBS from the 
default 94 cells to 200.

Quite strangely the PPPoA config was working fine with all the above pvc configs.

> In regards to the command not being accepted on eth subif, I took a 2nd look
> and it appears the command is a bit different for ethernet.  It is "pppoe
> enable group <groupname>".
> 

That worked fine!

Thanks a lot Andy ;-)

> Hope that helps,
> 
> Andy 
> 
> 
>>-----Original Message-----
>>From: Tassos Chatzithomaoglou [mailto:achatz at forthnet.gr] 
>>Sent: Thursday, March 10, 2005 12:53 PM
>>To: aschutz at cisco.com
>>Cc: 'cisco-bba'
>>Subject: Re: [cisco-bba] PPPoE and many virtual-templates 
>>(per subif/vlan)
>>
>>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
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>-- 
>>
>>>