Send 802.1p Value to Phone via LLDP

[Stephen_Elliot1]

Hello - happy Friday!

I'm familiar with the command below which tells connected phones to use the 'Voice' Vlan and send voice packets with DSCP set to 46.

"configure lldp port [port] advertise vendor-specific med policy application voice vlan [vlan] dscp 46"

However it appears that XOS sends a dot1p value of 7 (network control traffic) to the phone by default and I can't find out how to change that - I want it set to 5 which is more commonly used for Voice.

Any ideas?

Many thanks.....

[treese]

I have this config on one of our Core switches "configure dot1p type 5 qosprofile QP7" but not on the other. I don't see any counters incrementing. I have seen some counters in the passed on QP7 but don't anymore. We don't have LLDP enabled nor have policies or acl's that include qp7 neither. I'm cleaning up my qosprofiles and can not delete qp7 because of the config. I'm not sure if its doing anything or not. Any help with this is appreciated. We have a shoretel phone system but as far as I can tell we're not using any qos.

Thank you

[JS4]

hello Stephen,

I would suggest that you check this with our GTAC.
I am not certain this is actually the expected behavior [assuming you have not associated the VLAN to any QOS profile]

[Stephen_Elliot1]

...and as dot1p examination is turned on by default all voice RTP & signalling traffic is forwarded as the highest priority 'network control' traffic.

I'm surprised that vlans are set to advertise priority 7 by default, but thank you for the explanation, very helpful.

[JS4]

By default,

- all dot1p values but 7 are affected to QP1 ; 7 is affected to QP8

- dot1p examination is enabled

so taking classification precedence into consideration [table 91 - 16.1 userguide] and assuming you don't have any ACL- based QOS classification, I would suggest "dot1p=7 tagged" traffic should be sent to QP8.

the mapping table [dot1p <> QP] can be seen with "show dot1p"