Bug Report: Tagged VLAN traffic has PCP/CoS field set to 5

[oreo]

Reference: https://en.wikipedia.org/wiki/IEEE_802.1Q. The PCP field is also known as priority / class-of-service.

This is happening on all tagged VLAN traffic, including ARP packets. I tried two switches: an ICX 6450 and an ICX 7250.

Using `ip pcp-remark 0` on the VE interface corrects all traffic except ARP.

This is a very strange behavior -- possibly a bug? Can someone else confirm this?

[Chandini]

Hi Oreo

Thank you for reaching us.

Could you please share a screenshot or image for reference to help us better understand the specific details you're referring to?

Also, could you confirm the software version currently running on the switch? 

Thank you 

[oreo]

My issue is that the switches set the PCP/CoF/priority value to 5 when sending packets out a vlan tagged interface.

Example config:

!
vlan 210 by port
tagged ethe 1/1/1
router-interface ve 210
spanning-tree
!
interface ve 210
ip address 192.168.210.1 255.255.255.0
!

All packets going out of interface 1/1/1 will have PCP=5 in the 802.1Q frame. My expectation is that no priority value would be set since I have not configured QoS on the switch.

On the ICX 6450, I am running 08.0.30u. This is the latest available firmware. On the ICX 7250, I was running 08095m but I installed the latest available version (08.0.95r) and the behavior is still there.

[oreo]

My issue is that the switches set the PCP/CoF/priority value to 5 when sending packets out a vlan tagged interface.

Example config:

!
vlan 210 by port
tagged ethe 1/1/1
router-interface ve 210
spanning-tree
!
interface ve 210
ip address 192.168.210.1 255.255.255.0
!

All packets going out of interface 1/1/1 will have PCP=5 in the 802.1Q frame. My expectation is that no priority value would be set since I have not configured QoS on the switch.

On the ICX 6450, I am running 08.0.30u. This is the latest available firmware. On the ICX 7250, I was running 08095m but I installed the latest available version (08.0.95r) and the behavior is still there.

[Chandini]

Hi Oreo

Ack and Thank you for reaching us 

You mean Q5 in the interface output for port 1/1/1 ? 

For Example : Q5 in the Egress Q ?

Thank you