Configuring Policy Class of Service (CoS)
15-20 Policy Classification Configuration
2.0 97 irl none
2.0 98 irl none
2.0 99 irl none
4. In the CoS settings table, configure a CoS setting for CoS index 1, which has a priority of 0. We
enter the IRL reference, created in the previous step.
C3(su)->set cos settings 0 irl-reference 1
C3(su)->show cos settings
CoS Index Priority ToS IRL
--------- ---------- ------- -----
0 0 * 1
1 1 * *
2 2 * *
3 3 * *
4 4 * *
5 5 * *
6 6 * *
7 7 * *
About CoS-Based Flood Control
CoS-based flood control prevents configured ports from being disrupted by a traffic storm by rate-
limiting specific types of packets through those ports. When flood control is enabled on a port,
incoming traffic is monitored over one second intervals. During an interval, the incoming traffic
rate for each configured traffic type (unicast, broadcast, multicast) is compared with the
configured traffic flood control rate, specified in packets per second.
If, during a one second interval, the incoming traffic of a configured type reaches the traffic flood
control rate configured on the port, CoS-based flood control drops the traffic until the interval
ends. Packets are then allowed to flow again until the limit is again reached.
The following procedure describes the steps and commands required to configure CoS-based
flood control.
Example
This example creates a broadcast rate limiter (index 1.0) of 5 packets per second and assigns it to
ports ge.1.2 and ge.2.2.
C3(su)->set cos state enable
C3(su)->set cos port-resource flood-ctrl 1.0 broadcast rate 5
C3(su)->set cos port-config flood-ctrl 1.0 ports ge.1.2;ge.2.2 append
Procedure 15-2
Step Task Command(s)
1. Enable CoS. set cos state enable
2. Create a CoS flood control port resource, which
specifies flood control rate limiters that can be
mapped to specific ports.
set cos port-resource flood-ctrl
3. Assign the flood control resource to specific
ports.
set cos port-config flood-ctrl
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