Mailing List Archive: [Fwd: PPPoVPDN and VA bandwidth]

Anybody? I am coming to a conclusion that this is a limitation currently.

-------- Original Message --------
Subject: [cisco-bba] PPPoVPDN and VA bandwidth
Date: Tue, 09 Jan 2007 23:57:51 +0100
From: Gaurav Sabharwal <gaurav@inwire.net>
To: cisco-bba@puck.nether.net

RFC 2661 mentions Rx and Tx Connect Speed AVP that should be part of the
ICCN. However, while implementing client initiated L2TP and doing a
debug vpdn l2x-packets, I notice that the Connect Speed shown on the CPE
(Cisco 876) and the LNS (Cisco 7206VXR) is set to 0. This sets the
virtual-access and the virtual-ppp speeds to 100 Mbps.

*Jan 2 09:27:40.067: uid:48 Tnl/Sn 40583/143 L2TP: Parse AVP 0, len 8,
flag 0x8000 (M)
*Jan 2 09:27:40.067: uid:48 Tnl/Sn 40583/143 L2TP: Parse ICCN
*Jan 2 09:27:40.067: uid:48 Tnl/Sn 40583/143 L2TP: Parse AVP 24, len
10, flag 0x8000 (M)
*Jan 2 09:27:40.067: uid:48 Tnl/Sn 40583/143 L2TP: Connect Speed 0
*Jan 2 09:27:40.071: uid:48 Tnl/Sn 40583/143 L2TP: Parse AVP 19, len
10, flag 0x8000 (M)
*Jan 2 09:27:40.071: uid:48 Tnl/Sn 40583/143 L2TP: Framing Type 1

I assume that setting incorrect bandwidth on the interface would cause
problems if we were to implement QoS?

Is there a way to resolve the issue and make sure that the Tx speed sent
by the CPE are correct?

Thanks,
- Gaurav
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I agree, looks like client-initiated L2TP doesn't pass any meaningful
connect-speed to the LNS. Could be an interesting discussion which speed
to pass (as there are potentially multiple ingress interfaces using this
tunnel, so not as easy as on a traditional L2TP LAC), but you can
configure a bandwidth on the vtemplate on the LNS to workaround this,
and this will be used (you could even apply this on a per-user bases
using lcp:interface-config="bandwidth ...").

default config shows 100Mbit:

MHOP-LNS#sh int vi2.1
Virtual-Access2.1 is up, line protocol is up
Hardware is Virtual Access interface
Interface is unnumbered. Using address of Loopback0 (10.0.0.3)
MTU 1500 bytes, BW 100000 Kbit, DLY 100000 usec,

MHOP-LNS#conf t
Enter configuration commands, one per line. End with CNTL/Z.
MHOP-LNS(config)#int virtual-te 1
MHOP-LNS(config-if)#band
MHOP-LNS(config-if)#bandwidth 2000
MHOP-LNS(config-if)#^Z
MHOP-LNS#
MHOP-LNS#clear vpdn tunnel l2tp all
Clear all L2TP tunnels? [confirm]yStarting to clear the tunnel

MHOP-LNS#

after reestablishing the session we see this reflected on the VAI:

MHOP-LNS#sh int vi2.1
Virtual-Access2.1 is up, line protocol is up
Hardware is Virtual Access interface
Interface is unnumbered. Using address of Loopback0 (10.0.0.3)
MTU 1500 bytes, BW 2000 Kbit, DLY 100000 usec,

oli

cisco-bba-bounces@puck.nether.net <> wrote on :

> Anybody? I am coming to a conclusion that this is a
> limitation currently.
>
> -------- Original Message --------
> Subject: [cisco-bba] PPPoVPDN and VA bandwidth
> Date: Tue, 09 Jan 2007 23:57:51 +0100
> From: Gaurav Sabharwal <gaurav@inwire.net>
> To: cisco-bba@puck.nether.net
>
> RFC 2661 mentions Rx and Tx Connect Speed AVP that should be
> part of the
> ICCN. However, while implementing client initiated L2TP and doing a
> debug vpdn l2x-packets, I notice that the Connect Speed shown
> on the CPE
> (Cisco 876) and the LNS (Cisco 7206VXR) is set to 0. This sets the
> virtual-access and the virtual-ppp speeds to 100 Mbps.
>
> *Jan 2 09:27:40.067: uid:48 Tnl/Sn 40583/143 L2TP: Parse
> AVP 0, len 8,
> flag 0x8000 (M)
> *Jan 2 09:27:40.067: uid:48 Tnl/Sn 40583/143 L2TP: Parse ICCN
> *Jan 2 09:27:40.067: uid:48 Tnl/Sn 40583/143 L2TP: Parse AVP 24,
> len 10, flag 0x8000 (M)
> *Jan 2 09:27:40.067: uid:48 Tnl/Sn 40583/143 L2TP: Connect Speed 0
> *Jan 2 09:27:40.071: uid:48 Tnl/Sn 40583/143 L2TP: Parse AVP 19,
> len 10, flag 0x8000 (M)
> *Jan 2 09:27:40.071: uid:48 Tnl/Sn 40583/143 L2TP: Framing Type 1
>
> I assume that setting incorrect bandwidth on the interface would cause
> problems if we were to implement QoS?
>
> Is there a way to resolve the issue and make sure that the Tx
> speed sent
> by the CPE are correct?
>
> Thanks,
> - Gaurav
> _______________________________________________
> cisco-bba mailing list
> cisco-bba@puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-bba
>
> _______________________________________________
> cisco-bba mailing list
> cisco-bba@puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-bba

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