Brocade Communications Systems 6650 manual ACL based adaptive rate limiting parameters

		Configuring adaptive rate limiting
TABLE 20	ACL based adaptive rate limiting parameters
Parameter		Definition
Committed Information Rate (CIR)		The guaranteed rate of inbound traffic (in packets per second) allowed on a
		port.
Committed Burst Size (CBS)		The number of packets per second allowed in a burst before some packets
		exceed the committed information rate. Larger bursts are more likely to
		exceed the rate limit. The CBS must be a value greater than zero (0).
		Brocade recommends that this value be equal to or greater than the size of
		the largest possible IP packet in a stream.
Peak Information Rate (PIR)		The maximum packets/second rate for inbound traffic on a port. The PIR
		must be equal to or greater than the CIR.
Peak Burst Size (PBS)		The number of packets per second allowed in a burst before all packets
		exceed the peak information rate. The PBS must be a value greater than
		zero (0). Brocade recommends that this value be equal to or greater than
		the size of the largest possible IP packet in the stream.

If a port receives more than the configured packet rate, the port either drops or forwards subsequent data in hardware, depending on the action you specify.

Marking Class of Service parameters in adaptive rate limiting

When you create a TPD, explicit marking of CoS parameters, such as traffic class and 802.1p priority, are not available on the device. For a TPD defining rate limiting, the device re-marks CoS parameters based on the DSCP value in the packet header and the determined conformance level of the rate limited traffic, as shown in Table 21.

TABLE 21 CoS parameters for packets that use rate limiting traffic policies

Packet conformance level		Packet DSCP value		Traffic class and 802.1p priority
0	(Green)	0 – 7		0	(lowest priority queue)
or
		8 – 15		1
1	(Yellow)
		16 – 23		2
		24 – 31		3
		32	– 39	4
		40	– 47	5
		48	– 55	6
		56	– 63	7	(highest priority queue)
2	(Red)	N/A		0 (lowest priority queue)

Follow the steps given below to implement ACL-based adaptive rate limiting. 1. Create a traffic policy. Enter a command such as the following.

Brocade(config)# traffic-policy TPDAfour rate-limit adaptive cir 10000 cbs 1600 pir 20000 pbs 4000 exceed-action drop

2.Create a new extended ACL entry or modify an existing extended ACL entry that references the traffic policy. Enter a command such as the following.

Brocade(config)# access-list 104 permit ip host 10.10.12.2 any traffic-policy TPDAfour

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