QoS Options for IP ACLs

ACL Quality of Service (QoS) parameters enable you to perform QoS for packets that match the ACLs.

Using an ACL to perform QoS is an alternative to directly setting the internal forwarding priority based on incoming port, VLAN membership, and so on. The following QoS ACL options are supported:

  • dscp-cos mapping: This option is similar to the dscp-matching command. This option maps the DSCP value in incoming packets to a hardware table that provides mapping of each of the 0 through 63 DSCP values and distributes them among eight traffic classes (internal priorities) and eight 802.1p priorities.
  • dscp-marking: Marks the DSCP value in the outgoing packet with the value you specify.
  • internal-priority-marking and 802.1p-priority-marking: Supported with the DSCP marking option, these commands assign traffic that matches the ACL to a hardware forwarding queue (internal-priority-marking) and remark the packets that match the ACL with the 802.1p priority (802.1p-priority-marking).
  • dscp-matching: Matches on the packet DSCP value. This option does not change the packet-forwarding priority through the device or mark the packet.
  • 802.1p-priority-matching: Inspects the 802.1p bit in the ACL that can be used with adaptive rate limiting.

Note: The internal-priority-marking option is not supported for egress ACLs.

Note: For more information, refer to sequence (permit|deny in extended IPv4 ACLs) in the RUCKUS FastIron Command Reference.

In this section:

  1. Configuration Notes for QoS Options
  2. Using a Combined ACL for 802.1p Marking
    ICX devices support a simple method for assigning an 802.1p priority value to packets without affecting the actual packet or the DSCP.
  3. Configuring QoS Priority for a VLAN
    Use this procedure to configure QoS priority for a VLAN.
  4. DSCP Matching
Parent topic: IPv4 ACLs