TABLE 16 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)
•
When you define a TPD, reference the TPD in an ACL entry, and then apply the ACL to a VE in the Layer 3 router code, the rate
limit policy is accumulative for all of the ports in the port region. If the VE or VLAN contains ports that are in different port regions,
the rate limit policy is applied per port region.
For example, TPD1 has a rate limit policy of 600M and is referenced in ACL 101. ACL 101 is applied to VE 1, which contains
ethernet ports 1/1/1 to 1/1/4. Because ethernet ports 1/1/1 and 1/1/2 are in a different port region than ports 1/1/3 and 1/1/4, the
rate limit policy will be 600M for ports 1/1/1 and 1/1/2, and 600M for ports 1/1/3 and 1/1/4.
Maximum number of traffic policies supported on a device
The maximum number of supported active traffic policies is a system-wide parameter and depends on the device you are configuring, as
follows:
•
By default, up to 1024 active traffic policies are supported on Layer 2 switches. This value is fixed on Layer 2 switches and cannot
be modified.
•
For FastIron devices the number of active traffic policies supported on Layer 3 switches varies depending on the configuration and
the available system memory. The default value and also the maximum number of traffic policies supported on Layer 3 switches is
50.
Configuring rate limiting
Configuring port-based fixed rate limiting
Follow these steps to configure a ports rate limiting policy.
These commands configure a fixed rate limiting policy that allows Ethernet port 1/1/1 to receive a maximum of 500 kbps. If the port
receives additional bytes during a given one-second interval, all inbound packets on the port are dropped until the next one-second interval
starts.
When traffic reaches the rate limiting threshold, Traffic Domain 2 (TD2) sends traditional pause or Priority Flow Control (PFC) frames,
depending on the flow-control configuration.
When PFC is enabled, TD2 transmits PFC for all priorities mapped to the lossless priority group that reaches the XOFF limit (TD2 chip
limitation).
1. Enter global configuration mode.
device# configure terminal
Rate Limiting and Rate Shaping
Rate Limiting
Ruckus FastIron QoS and Traffic Management Configuration Guide, 08.0.70
Part Number: 53-1005294-01
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