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Alteon OS Application Guide
128
Chapter 7: Quality of Service 42C4911, January 2007
Summary of ACL Actions
Actions determine how the traffic is treated. The GbESM 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 seven major Precedence Groups, as shown in Table 7-4.
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, the lowest-
numbered ACL has the lowest precedence level, and the highest-numbered ACL has the high-
est precedence level. However, the other ACLs within the Precedence Group have an unspeci-
fied 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
Table 7-4 ACL Precedence Groups
Precedence Group ACLs Precedence Level
Precedence Group 1 ACL 1 - ACL 128 Low
High
Precedence Group 2 ACL 129 - ACL 256
Precedence Group 3 ACL 257 - ACL 384