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Configuring CoS-Based Flood Control
Overview
This function allows the user to control broadcast, unknown unicast, and/or multicast flooding. It prevents
configured ports from being disrupted by a traffic storm by rate-limiting packets through those interfaces.
Procedure
Enable CoS on the switch. (Default state is disabled.)
1.
set cos state enable
2. Create a CoS flood control port resource. This will specify flood control rate limiters that can be mapped to
specific ports:
set cos port-resource flood-ctrl group-type-index {unicast | multicast |
broadcast | all} rate rate
group-type-index - Specifies an inbound rate limiting port group/type index. Valid entries are
in the form of group#.port.type. Valid values for group# can range from 0 to 7. Valid values for port‐ type can
range from 0 to 1, although only port type 0 is currently supported.
For example, port group 1 would be specified as 1.0.
rate – Specifies a rate limit in packets per second.
Example
This sets a port resource broadcast rate limiter (index 1.0) of 5 packets per second.
set cos port-resource flood-ctrl 1.0 broadcast
3. Assign the flood control port resource to specific ports.
set cos port-config flood-ctrl group-type-index {name name | ports port-
list}[append]
Example
This adds ports ge.1.2 and ge.2.2 to the previously created port resource broadcast rate limiter 1.0.
These ports will now be in a CoS port group configured with the assigned rate limiter.
set cos port-config flood-ctrl 1.0 ports ge.1.2;ge.2.2 append
4. (Optional) Show the flood control settings.
show cos port-resource flood-ctrl [group-type-index]
show cos port-config flood-ctrl [group-type-index]
If group-type-index is not specified, all configured resources will be displayed.
08/13/2008 P/N: 9038155-52
F0615-O
Appendix A
Subject to Change Without Notice
CUSTOMER RELEASE NOTES
rate 5
Page: 39 of 41
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