I do not see 802.1Q tags nor do I see p-bits (COS) in my wireshark captures. My setup is not working and I have no way to verify (sniff) that the 6509 is setting the p-bits to 3. I need to see them to troubleshoot effectively. Help!
I am port mirroring off of my 6509. Port 1/16 should be tagging and setting the p-bits to a value of 3. How can I confirm?
no ip address
mls qos cos 3 ! I've tried my tests with and without this command
mls qos cos trust ! I've tried my tests with and without this command
switchport access vlan 941
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 941
switchport mode trunk
no cdp enable
Port G1/16 is the GE uplink to DonkX
Port G8/47 is the Windows 2003 Server with wireshark.
Port G8/9 is my RH4 Linux box with TCPdump.
Steps taken to resolve the problem:
I have followed this document to set this up correctly on my windows box with a Intel Proset 1000MT. I have updated the drivers and made the registry changes with no captures showing tagging/cos information.
Regardless of my settings, this document says I shouldn't have to worry about drivers:
"You'll definitely see the VLAN tags, regardless of what OS the independent system is running or what type of network adapter you're using."
I am testing a new GPON access product (DonkX) that uplinks via GigE using trunking and setting p-bits. To prioritize my video the new DonkX sets the p-bits to 3 and it instantly ceases that traffic. I have only unidirectional traffic at this point so I can no longer arp, icmp, ftp, tftp, noth'n. The 6509 sends back a response to DonkX but I believe it is dropped because the p-bit is not set to 3. If I remove the priority from 3 to 0 on the DonkX system then it works correctly but without QoS of course.
swichport trunk enc dot1q
switchport mode trunk
the SPAN destination port has to be set for trunking to see 802.1Q tags in mirrored traffic
SPAN copies Layer 2 Ethernet frames, but SPAN does not copy source trunk port ISL or 802.1Q tags. You can configure destination ports as trunks to send locally tagged traffic to the traffic analyzer.
A destination port configured as a trunk tags traffic from a Layer 3 LAN source port with the internal VLAN used by the Layer 3 LAN port.
Hope to help