Assigning a priority based on source-port
This option assigns a priority to all outbound packets having the specified source-port. You can configure this option by either specifying the source-port ahead of the
qos command or moving to the port context for the port you want to configure for priority. (If you are configuring multiple source-ports with the same priority, you may find it easier to use the
interface
<port-list>
command to go to the port context instead of individually configuring the priority for each port.)
Syntax:
interface <port-list> qos priority <0-7>
Configures an 802.1p priority for packets entering the switch through the specified (source) ports. This priority determines the packet queue in the outbound ports to which traffic is sent. If a packet leaves the switch on a tagged port, it carries the 802.1p priority with it to the next downstream device. You can configure one QoS classifier for each source-port or group of source-ports.
(Default:
No-override)
Syntax:
no interface <port-list> qos
Disables use of the specified source-ports for QoS classifiers and resets the priority for the specified sourceports to
No-override.
Syntax:
show qos port-priority
Lists the QoS port-priority classifiers with their priority data.
Source-port |
Priority |
|---|---|
1–3 |
2 |
4 |
3 |
You would then execute the following commands to prioritize traffic received on the above ports.
Configuring and displaying source-port QoS priorities
switch(config)# interface e 1-3 qos priority 2 switch(config)# interface e 4 qos priority 3 switch(config)# show qos port-priority Port priorities Port Apply rule | DSCP Priority Radius Override ---- ---------- ---- -------- --------------- 1 Priority | 2 No-override 2 Priority | 2 No-override 3 Priority | 2 No-override 4 Priority | 3 No-override 5 No-override | No-override No-override . . . . . . . .
If you then decided to remove port 1 from QoS prioritization:
Returning a QoS-prioritized VLAN to “No-override” status
In this instance,
No-override indicates that port 1 is not prioritized by QoS.
switch(config)# no interface 1 qos switch(config)# show qos port-priority Port priorities Port Apply rule | DSCP Priority Radius Override ---- ---------- ---- -------- --------------- 1 No-override | No-override No-override 2 Priority | 2 No-override 3 Priority | 2 No-override 4 Priority | 3 No-override 5 No-override | No-override No-override . . . . . . . .