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

Andy Schutz (aschutz) aschutz at cisco.com
Thu Mar 10 14:21:42 EST 2005


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.

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>".

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


More information about the cisco-bba mailing list