KB.15.15

Example 156 Prioritizing inbound traffic on source-ports

Prioritizing inbound traffic on the following source-ports:

PrioritySource-Port

2A1 - A3

3A4

5B1, B4

6C1-C3

Enter the following commands to prioritize packets received from the specified source ports:

Figure 44 Configuring and Viewing source-port QoS priorities

If you later decided to remove source-port A1 from QoS prioritization, you would enter the following

command:

Figure 45 Returning a QoS-prioritized VLAN to "No-override" status

Assigning a DSCP policy for a global source-port classifier

This global QoS packet-marking option assigns a previously configured DSCP policy (codepoint

and 802.1p priority) to outbound IP packets received from the specified source-ports. The switch:

1. Selects an incoming IP packet on the basis of its source-port.

2. Overwrites the packet's DSCP with the DSCP configured for matching packets.

3. Assigns the 802.1p priority associated with the new DSCP.

4. Forwards the packet through the appropriate outbound port queue.

Creating a policy based on source-port classifiers

Only one DSCP per source-port may be used to mark matching packets.

Configuring a new DSCP for a source-port automatically overwrites any previous DSCP or 802.1p

priority configuration for that source-port classifier.

214 Quality of Service: Managing bandwidth effectively