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Catalyst 6500 Series Switch Command Reference—Release8.4
OL-6244-01
Chapter2 Catalyst 6500 Series Switch and ROM Monitor Commands
set rate-limit
set rate-limit
To enable, disable, or set the Layer 2 rate limiters, use the set rate-limit command.
set rate-limit {l2pdu | l2port-security | l2protocol-tunnel} {enable | disable}
set rate-limit {l2pdu | l2port-security | l2protocol-tunnel} rate rate
Syntax Description
Defaults The defaults are as follows:
•Rate limiting is disabled.
•If enabled, the default rate is 1000 packets per second.
Command Types Switch command.
Command Modes Privileged.
Usage Guidelines You can configure a maximum of four rate limiters.
The following restrictions apply if you want to enable rate limiting:
•Hardware-based rate limiters are supported on Catalyst 6500 series switches that are configured
with a Distributed Forwarding Card 3A (DFC3A) or the Policy Feature Card 3 (PFC3) on ly.
•The Catalyst 6500 series switch cannot be in truncated mode. If you attempt to enable rate limiting
and you are in truncated mode, a message is displayed.
If the rate limiter is enabled and some events cause the system to go from nontruncated mode to truncated
mode, rate limiting is disabled and a message is displayed.
Rate limiters control packets as follows:
•The frames are classified as Layer 2 control frames by the d estination M AC address. T he destination
MAC address used are as follows:
–
0180.C200.0000 for IEEE BPDU
–
0100.0CCC.CCCC for CDP
–
0100.0CCC.CCCD for PVST/SSTP BPDU
l2pdu Specifies rate limiting for the spanning-tree BPDUs—IEEE and SSTP,
CDP, UDLD, VTP, and PAgP.
l2port-security Specifies rate limiting for port security.
l2protocol-tunnel Specifies rate limiting for the protocol tunnel-encapsulated PDUs.
enable Enables Layer 2 rate limiting.
disable Disables Layer 2 rate limiting.
rate rate Specifies the rate-limiting threshold in packets per seconds; valid values are
from 10 to 1000000.