11-26-2013 12:54 PM - edited 03-07-2019 04:48 PM
Hi,
I was just doing some testing to ensure that the command 'mls qos trust dscp' is working on my 6509 switches before rolling out QoS.
Before adding any configuration I could see using wireshark that traffic from my Avaya 9608 handset was coming through with a DSCP value of 46 (as it is supposed to).
I then added the command 'mls qos' (at global level)
on examining the wireshark output this time, the DSCP value had been set to zero (i.e. it defaulted it to best effort)
I then expected by adding the commmand 'mls qos trust dscp' on the interface the phone is connected to that the DSCP value would would again be left alone?
does anybody know why this is happening?
Many thanks in advance.
Andy
11-26-2013 01:40 PM
no responses
please let me know if I haven't made the question clear!!
Thanks...
Andy
11-26-2013 01:51 PM
please show your complete qos-config and also the config of the port where your phone is connected.
--
Don't stop after you've improved your network! Improve the world by lending money to the working poor:
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11-26-2013 02:03 PM
Hi,
thanks for your reply.
mls qos
interface GigabitEthernet3/34
description *** DATA VLAN 35 - VOICE VLAN 34 ***
switchport
switchport trunk native vlan 36
switchport trunk allowed vlan 34,36
switchport mode trunk
mls qos trust dscp
no cdp enable
spanning-tree portfast trunk
If i don't include the global 'mls qos' command then the voice packets keep the dscp 46 value. If I add the mls qos command this causes the switch to set the dscp values to zero.
???
Thanks again
ps. there are some other mls commands on the switch... i don't know if these could interfere but they were already on there so i'm reluctant to remove them..
11-26-2013 02:06 PM
ps. there are some other mls commands on the switch... i don't know if these could interfere but they were already on there so i'm reluctant to remove them..
Any chance you could post them ?
Jon
11-26-2013 02:08 PM
well, the other commands also control how QoS is handled by the switch ...
And in addition to that, post the output of "sh mls qos interface gig 3/34" while "mls qos" is enabled.
--
Don't stop after you've improved your network! Improve the world by lending money to the working poor:
http://www.kiva.org/invitedby/karsteni
11-26-2013 02:11 PM
ah!
Sorry.. I meant to add the additonal commands that are present on the switch..
here they are!
mls ip slb purge global
mls netflow interface
no mls flow ip
mls cef error action reset
11-26-2013 02:47 PM
Hi.
i tried the command -
sh mls qos interface gig 3/34
The switch wouldn't accept the interface part of the command?
RS03-6509E-DIST-ML-01#show mls qos ?
aggregate-policer aggregate-policer keyword
arp arp keyword
ip ip keyword
ipv6 ipv6 keyword
last last keyword
mac mac keyword
maps maps keyword
module show entries in module
protocol protocol passthrough information
statistics-export QOS Statistics export
| Output modifiers
thanks
11-26-2013 02:49 PM
unfortunately I can't continue now as the security guard is kicking me out of the office now... I'll be back tomorrow.
thanks to everyone for their help this evening.
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