Configuring Cos Tail Drop Profiles (Cli Procedure) - Dell PowerConnect J-EX4200-24T Software Manual

Configuring CoS Tail Drop Profiles (CLI Procedure)

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Defining CoS Rewrite Rules (CLI Procedure)
Tail drop is a simple and effective traffic congestion avoidance mechanism. When you
apply this mechanism to manage congestion, packets are dropped when the output
queue is full.
To configure CoS tail-drop profiles, create a drop profile name (
level ( ):
25
[edit class-of-service drop-profiles]
user@switch# set be-dp fill-level 25
Example: Configuring CoS on J-EX Series Switches on page 2883
Understanding CoS Tail Drop Profiles on page 2872
You configure rewrite rules to alter CoS values in outgoing packets on the outbound
interfaces of a J-EX Series switch to match the policies of a targeted peer. Policy matching
allows the downstream routing platform or switch in a neighboring network to classify
each packet into the appropriate service group.
To configure a CoS rewrite rule, create the rule by giving it a name and associating it with
a forwarding class, loss priority, and a code point, thus creating a rewrite table. After the
rewrite rule is created, enable it on an interface. You can also apply an existing rewrite
rule on an interface.
NOTE: To replace an existing rewrite rule on the interface with a new rewrite
rule of the same type, first explicitly remove the rewrite rule and then apply
the new rule.
NOTE: Custom rewrite-rule bindings are implemented through filters. And
custom rewrite rules cannot be bound to routed VLAN interfaces (RVIs).
To create rewrite rules and enable them on interfaces:
To create an 802.1p rewrite rule named customup-rw in the rewrite table for all Layer
2 interfaces:
[edit class-of-service rewrite-rules]
user@switch# set ieee-802.1 customup-rw forwarding-class be loss-priority low
code-point 000
user@switch# set ieee-802.1 customup-rw forwarding-class be loss-priority high
code-point 001
user@switch# set ieee-802.1 customup-rw forwarding-class af loss-priority low
code-point 010
user@switch# set ieee-802.1 customup-rw forwarding-class af loss-priority high
code-point 011
Chapter 109: Configuring CoS
) and assign a fill
be-dp
2925