Leaflet

79
OL-11615-01
This rate limiter is disabled by default. To enable and set the Layer 2 protocol tunneling rate limiter, use
the mls rate-limit layer2 l2pt command.
Router(config)# mls rate-limit layer2 l2pt pps [ packets-in-burst ]
This example shows how to rate limit Layer 2 protocol tunneling packets to 10000 pps with a burst of
10 packets:
Router(config)# mls rate-limit layer2 l2pt 10000 10
For more information on the mls rate-limit layer2 l2pt command, refer to the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/122sx/cmdref/m1.htm#wp1729104
Layer 2 Multicast IGMP Snooping
The IGMP snooping rate limiter limits the number of Layer 2 IGMP packets destined for the supervisor
engine. IGMP snooping listens to IGMP messages between the hosts and the supervisor engine. You
cannot enable the Layer 2 multicast IGMP snooping rate limiter if the Catalyst 6500 Series switch is
operating in truncated mode. The switch uses truncated mode for traffic between fabric-enabled modules
when there are both fabric-enabled and nonfabric-enabled modules installed. In this mode, the switch
sends a truncated version of the traffic (the first 64 bytes of the frame) over the switch fabric channel.
This rate limiter should be used only when IGMP snooping is enabled.
This rate limiter is disabled by default. To enable and set the Layer 2 protocol tunneling rate limiter, use
the mls rate-limit multicast ipv4 igmp command.
Router(config)# mls rate-limit multicast ipv4 igmp pps [ packets-in-burst ]
This example shows how to rate limit IGMP-snooping traffic:
Router(config)# mls rate-limit multicast ipv4 igmp 20000 40
For more information on the mls rate-limit multicast ipv4 igmp command, refer to the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/122sx/cmdref/m1.htm#wp1499703
IPv4 Multicast
The IPv4 multicast rate limiter limits IPv4 multicast packets. The rate limiters can rate-limit packets that
are sent from the data path in the hardware to the data path in the software. The rate limiters protect the
control path in the software from congestion and drop the traffic that exceeds the configured rate. Within
the IPv4 multicast rate limiter, there are three rate limiters that you can also configure: the FIB-miss rate
limiter, the multicast partially switched flows rate limiter, and the multicast directly connected rate
limiter.
The FIB-miss rate limiter allows you to rate limit the multicast traffic that does not match an entry in the
mroute table. This rate limiter is enabled by default with a limit of 100000pps, and a burst of 100 packets.
To enable and set the FIB-miss rate limiter, use the mls rate-limit multicast ipv4 fib-miss command.
Router(config)# mls rate-limit multicast ipv4 fib-miss pps [ packets-in-burst ]
The partially switched flow rate limiter allows you to rate limit the flows destined to the MSFC3 for
forwarding and replication. For a given multicast traffic flow, if at least one outgoing Layer 3 interface
is multilayer switched, and at least one outgoing interface is not multilayer switched (no H-bit set for
hardware switching), the particular flow is considered partially switched, or partial-SC (partial shortcut).
The outgoing interfaces that have the H-bit flag are switched in hardware and the remaining traffic is
switched in software through the MSFC3. For this reason, you might want to rate limit the flow destined