[nsp] Help with QoS

[francisv@dagupan.com]

Hi,

I wanted to prioritize traffic coming from two workstations connected to a
2924 catalyst switch. The workstations are Windows Media encoders and serve
traffic to Windows Media server/reflectors over a WAN link. On some
occasions, the WAN link gets congested and the session between the encoders
and servers is cutoff.

Here's the network layout:

[MS encoder machines]
       |
[Catalyst 2924]  
       |        +--E1-->[to Cisco 1750 @ local IX]
       |       /
[Cisco 3640]--+
               \
                +--E1-->[to Cisco 7206 @ core]

I labeled the packets on the ports where the encoders are connected with a
value of 5:

interface FastEthernet0/18
 description MS Media Encoder 1
 duplex full
 speed 100
 switchport priority default 5
!
interface FastEthernet0/19
 description MS Media Encoder 2
 duplex full
 speed 100
 switchport priority default 5

and on the Cisco 3640, I created a class-map to match the COS from the
switch and then do some stuff to it in a policy-map:

class-map match-all COS5
 match cos 5

policy-map HIGH-PRIORITY
 class COS5
  set ip dscp 10
  priority 128 

and then applying that to the outgoing interface:

c3640-noc-cal(config-if)#service-policy output HIGH-PRIORITY
'match cos' supported only with IEEE 802.1Q/ISL interfaces

I'm assuming that COS is not carried all the way to the router from the
switch. Is there any other way around this? Will DSCP be carried over the
WAN interface? I'd like to also look at the DSCP tag once it reaches other
routers within our administrative control.

Thanks.

---
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