Quality of Service

Packet Format

Ethernet format (eth2, SNAP, LLC)

Ethernet tagging format

Egress port packets

Note that the egress port ACL will not match a broadcast, multicast, unknown unicast, or Layer 3 packet. The egress port ACL will not match packets if the destination port is a trunk member.

Summary of ACL actions

Actions determine how the traffic is treated. The HP 10GbE switch QoS actions include the following:

Pass or Drop

Re-mark a new DiffServ Code Point (DSCP)

Re-mark the 802.1p field

Set the COS queue

Understanding ACL precedence

Each ACL has a unique precedence level, based on its number. When an incoming packet matches the highest precedence ACL, the ACL’s configured action takes place. The other assigned ACLs also are considered, in order of precedence.

ACLs are divided into Precedence Groups, as shown in the following table.

 

Precedence GroupACLsPrecedence Level

 

 

 

 

 

 

 

Precedence Group 1

ACL 1 – ACL 128

Low

 

 

 

 

 

 

 

Precedence Group 2

ACL 129 – ACL 256

 

 

 

 

 

 

 

 

Precedence Group 3

ACL 257 – ACL 384

High

 

 

 

 

 

 

 

 

 

 

 

NOTE: Precedence Groups are not related to ACL Groups.

Each Precedence Group has its own precedence level, such that Precedence Group 2 has a higher precedence level than Precedence Group 1. Within each Precedence Group, higher-numbered ACLs receive higher precedence, so that the lowest-numbered ACL has the lowest precedence level, and the highest-numbered ACL has the highest precedence level. However, the other ACLs within the Precedence Group have an unspecified precedence level, as follows:

ACL 1 = lowest precedence level within Precedence Group 1 ACL 2 = unspecified precedence level within Precedence Group 1 ACL 3 = unspecified precedence level within Precedence Group 1

...

ACL 126 = unspecified precedence level within Precedence Group 1 ACL 127 = unspecified precedence level within Precedence Group 1 ACL 128 = highest precedence level within Precedence Group 1

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