[c-nsp] Citrix and Cisco QOS

[Cameron Dry]

Try tuning the tx-ring on the ATM
interface.

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of De Houwer, Wim
Sent: Thursday, 12 January 2006 6:36 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Citrix and Cisco QOS



Hey All,

Does anyone have good tips on prioritizing citrix by using class-maps &
policy maps ?

I'm trying to make sure that the citrix traffic will always have
priority (and guaranteed bandwith) over *all* other trafic.

This is what i made:

Cpe SITE1 --sdsl-- PE Router ---sdsl--- Cpe SITE2

--- SNIP ---

class-map match-all citrix
  match protocol citrix
!
!
policy-map queueing
  class citrix
    priority percent 50
  class class-default
   fair-queue

interface ATM0
 ip address x.x.x.x y.y.y.Y
 ip nbar protocol-discovery
 no atm ilmi-keepalive
 pvc 8/35
  protocol ip z.z.z.z broadcast
  vbr-nrt 1024 1024
  encapsulation aal5snap
  service-policy output queueing

--- SNIP ---


This config is applied both on the interfaces of the CPE (both sites) as
on the PE router (both links to 2 sites). 

So what it's supposed to do is make sure that citrix classified traffic
(using nbar) always has 50% of the total BandWidth.

But when the customer starts some legacy application that transfers big
files from one site to the other, the citrix session starts to act very
slowly and ICMP response goes up, which is normal as the line is
completely full and icmp is not prioritized.

Any suggestions anyone ?

Kind Regards,

Wim

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