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20 Posts
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5051
October 9th, 2016 08:00
Traffic Policy - Marking DSCP value
Dear All,
I am attempting to configure a traffic policy on a Dell 2048P switch. The aim of the policy is to change the DSCP value of traffic going to a specific server from DSCP value 0 to 10. Interface 3/0/3 is the PC that is connecting to server 10.51.53.16.
I can see packets incrementing from the show output on the switch, but when I perform a wireshark trace by monitoring the PC port, the DSCP value remains at 0 instead of 10.
Configuration as follows:
class-map match-all class_ccx ipv4
match dstip 10.51.53.16 255.255.255.0
exit
policy-map test_policy in
class class_ccx
mark ip-dscp 10
show running-config interface gigabitethernet 3/0/3
service-policy in test_policy
Interface...................................... Gi3/0/3
Direction...................................... In
Operational Status............................. Up
Policy Name.................................... test_policy
Class Name..................................... class_ccx
In Offered Packets............................. 573
In Discarded Packets........................... 0
show class-map class_ccx
Class Name..................................... class_ccx Class Type..................................... All Class Layer3 Protocol.......................... ipv4
Match Criteria Values ---------------------------- ------------------------------------- Destination IP Address 10.51.53.16 (255.255.255.0)
Class Name..................................... class_ccx
Mark IP DSCP................................... 10(af11)
As mentioned, I cannot see any evidence that the DSCP value has been changed for traffic going to my server.
Many Thanks
Jamie
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jameshead79
20 Posts
0
October 10th, 2016 14:00
Hi Daniel,
That's correct, i am indeed running some tests although the testing is being performed on my production environment.
My goal is to change the DSCP value of a web based application called Cisco Finesse which interfaces with our phones. My phones mark their own traffic and all my switches will honor the EF marking and give the voice traffic strict priority. However, Cisco Finesse also requires priority treatment but it uses a default DSCP marking of 0. I need to remark the DSCP value of the Finesse traffic as close to the source, which is the users switch port.
I figured I needed two traffic policies. One inbound to the users port and the other inbound to the server as the traffic between Cisco Finesse and the server is bidirectional.
During my testing, I only created a traffic policy at the users end. I didn't get as far as creating the traffic policy at the server end. The aim is to ensure Finesse is placed in an AF queue end-to-end.
However, I was hoping to see at least the packet being correctly remarked as it was exiting the interface whilst I monitoring the port.
Assuming the configuration looks good then i'll configure the traffic policy at the server end and run another wireshark test.
Jamie
jameshead79
20 Posts
0
October 10th, 2016 15:00
Fantastic Dan, you've been a great help.
What I will do is configure the traffic policy at both ends and mirror the switch uplink on the users switch.
This way, i should see the traffic in transit after the packet has been through both policies.
Most appreciated.
Jamie