[cisco-bba] ASR1K LNS

Gary T. Giesen ggiesen+cisco-bba at giesen.me
Mon Dec 7 17:46:33 EST 2015

You probably need to shape to a circuit speed rather than a percentage. I
know I ran into some weird quirks with QoS on the ASR1001-X, where it
wouldn't do QoS at all if the circuit traversed over an LACP link. I believe
that part was finally fixed. The ASR looks like it hard enforces the session
over whatever transport it maps to, and can change for example if you have a
path failure and the path changes.

You can push down the QoS profile from RADIUS (on a per user basis), and tag
different users with different profiles (depending on what connection speed
they are supposed to have). Obviously not as ideal as having it use the
LAC's speed, but it should work.


> -----Original Message-----
> From: cisco-bba [mailto:cisco-bba-bounces at puck.nether.net] On Behalf Of
> James Bensley
> Sent: November 20, 2015 11:38 AM
> To: cisco-bba at puck.nether.net
> Subject: [cisco-bba] ASR1K LNS
> Hi All,
> I guess a while back many people moved their PPP subscribers over to
> ASR1Ks and ASR9Ks etc, probably mostly from 7200/7300/7600 series devices
> and similar.
> I'm finally looking at moving over users with QoS and I'm having several
> issues as it goes, but the very first one I want to tackle is just
applying a basic
> shaper. This shaper is shaping to 95% of 1G not 95% of the uer session :(
> though the LNS nows the subscriber speed (i.e. the LAC is sending it over
> the L2TP call setup):
>  class class-default
>   shape average percent 95
>    service-policy CPE-DSL-QOS-PE-OUT
> lns1-lhclon.core#show policy-map interface vi2.1
>  Virtual-Access2.1
>  SSS session identifier 1 -
>   Service-policy output: PE-DSL-QOS-PARENT-OUT
>     Class-map: class-default (match-any)
>       7 packets, 588 bytes
>       30 second offered rate 0000 bps, drop rate 0000 bps
>       Match: any
>       Queueing
>       queue limit 665 packets
>       (queue depth/total drops/no-buffer drops) 0/0/0
>       (pkts output/bytes output) 0/0
>       shape (average) cir 950000000, bc 9500000, be 9500000
>       target shape rate 950000000
> Any one seen this, fixed it?
> The core-facing interfaces on this ASR1002-X (IOS-XE 03.13.04.S,
> 15.4(3)S4) are a 2x1G etherchannel.
> Cheers,
> James.
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