3.7.2 User priority inheritance
When you use VLAN tunneling to add a VLAN tag to frames from the access line and forward them to the backbone line, you can use the user priority inheritance functionality. This functionality inherits the user priority of a frame detected by flow detection as the user priority of the backbone line (user priority in the added VLAN tag) and the CoS values for priority determination. This functionality uses the following frames:
-
Frames forwarded by the Switch
-
Frames sent to the Switch
You can set user priority inheritance on a receiving-side Ethernet interface for which VLAN tunneling is configured.
The following table describes the values set when user priority inheritance is set.
|
User priority of frames detected by flow detection |
Outgoing frames |
|
|---|---|---|
|
User priority |
CoS value |
|
|
Without VLAN tag |
0 |
0 |
|
0 |
0 |
0 |
|
1 |
1 |
1 |
|
2 |
2 |
2 |
|
3 |
3 |
3 |
|
4 |
4 |
4 |
|
5 |
5 |
5 |
|
6 |
6 |
6 |
|
7 |
7 |
7 |
You cannot set user priority inheritance concurrently with user priority rewriting and priority determination (CoS value specification).
For CoS when user priority inheritance is not set, see "3.10.2 CoS and queuing priority" and for the user priority, see "3.7.1 Rewriting user priority".