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.....

[Stephen_Elliot1]

Thanks JS, that seems to work!

Not sure at the moment if I'll implement it, as we're already using QP6 for all Voice traffic and QP4 for all Voice-Signalling traffic. So, if I mark the whole 'Voice' Vlan as QP6 both RTP & Signalling will be treated with the top priority, not necessarily something I'm looking for.

One question though, assuming the phone sends through a frame with a dot1p value of 7, what will the switch do with it under default configuration?

[JS4]

# from the userguide : the L2 priority is derived from the vlan priority.
# assuming you want to assign 5 to the dot1p field, could you try the folloing to propagate the value of the dot1p value of 5 via LLDP MED,

Create qosprofile QP6
configure dot1p type 5 qp6

# assuming lldp is already configured
configure lldp ports [all | port_list] advertise vendor-specific med capabilities
configure lldp ports [all | port_list] advertise vendor-specific med policy application voice vlan voice dscp dscp_value 46

# configure the voice vlan to QP6 -> then the phone should hopefully start using dot1p=5
Configure vlan voice qosprofile qp6

[StephenW]

If anyone else has a problem you can view this article. https://gtacknowledge.extremenetworks.com/articles/How_To/How-to-configure-LLDP-for-Extreme-switches...

[Stephen_Elliot1]

Yep...

enable lldp ports all
configure lldp port all advertise vendor-specific med capabilities
configure lldp port all advertise vendor-specific med policy application voice vlan VOICE dscp 46

.....but no option to amend the dot1p value sent in the policy?

[Henrique]

Hi Stephen, did you add the LLDP MED capabilities TLV before configuring this TLV?

configure lldp ports advertise vendor-specific med capabilities