Enterasys Networks 9034313-07 manual About CoS-Based Flood Control, Procedure

Configuring Policy Class of Service (CoS)

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

Co

Note: CoS-based flood control does not require a policy license on SecureStack B3 switches or on standalone D2 switches.

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.

Procedure 11-2

Step	Task	Command(s)
1.	Enable CoS.	set cos state enable
2.	Create a CoS flood control port resource, which	set cos port-resource flood-ctrl
	specifies flood control rate limiters that can be
	mapped to specific ports.
3.	Assign the flood control resource to specific	set cos port-config flood-ctrl
	ports.

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

SecureStack C3 Configuration Guide 11-19