Port Status and Basic Configuration

Configuring Port-Based Priority for Incoming Packets on the 4100gl and 6108 Switches

■On a given port, an inbound, tagged packet received on the port with a preset priority of 1 - 7 in its tag keeps that priority and is assigned an outbound queue on the basis of that priority (regardless of the port-based priority configured on the port). (Refer to table 10-3, “Mapping Priority Settings to Device Queues” on page 10-30.)

■If a packet leaves the switch through an outbound port configured as an untagged member of the packet’s VLAN, then the packet leaves the switch without a VLAN tag and thus without an 802.1p priority setting.

■Trunked ports do not allow non-default (1 - 7) port-based priority settings. If you configure a non-default port-based priority value on a port and then add the port to a port trunk, then the port-based priority for that port is returned to the default “0”.

Configuring and Viewing Port-Based Priority

This command enables or disables port-based priority on a per-port basis. You can either enter the command on the interface context level or include the interface in the command.

Syntax: interface <port #> qos priority < 1 .. 7 >

Configures a non-default port-based 802.1p priority for incoming, untagged packets or tagged packets arriving with a "0" priority on the designated ports, as described under "Operating Rules for Port-Based Priority", above.

interface <port #> qos priority 0

Returns a port-based priority setting to the default "0" for untagged packets received on the designated port(s). In this state the switch handles the untagged packets with "Normal" priority. (Refer to table 10-3 on page 10-30.)

show running-config

Lists any non-default (1 - 7) port-based priority settings in the running-config file on a per-port basis. If the priority is set to the (default) "0", the setting is not included in the show config listing.

show config

Lists any non-default (1 - 7) port-based priority settings in the startup-config file on a per-port basis. If the priority is set to the (default) "0", the setting is not included in the show config listing.

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