Brocade Communications Systems Brocade ICX 6650 6650 - Manual (Page 165)

Brocade ICX 6650 Security Configuration Guide 145
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Configuring adaptive rate limiting
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 .
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
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.
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)
or
1 (Yellow) 0 – 7 0 (lowest priority queue)
8 – 15 1
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)