Configuring inbound rate-limiting for broadcast and multicast traffic
You can configure rate-limiting (throttling) of inbound broadcast and multicast traffic on the switch, which helps
prevent the switch from being disrupted by traffic storms if they occur on the rate-limited port. The rate-limiting is
implemented as a percentage of the total available bandwidth on the port.
The rate-limit command can be executed from the global or interface context, for Example:
switch(config)# interface 3 rate-limit bcast in percent 10
or
switch(config)# interface 3
switch(eth-3)# rate-limit bcast in percent 10
Syntax:
rate-limit {< bcast | mcast >} in percent < 0-100 >
Option
in percent <0-100>
Also supports configuring limit in kbps
[no] rate-limit {<bcast | [mcast >]} in
Enables rate-limiting and sets limits for the specified inbound broadcast or multicast traffic. Only the amount of
traffic specified by the percent is forwarded.
Default: Disabled
If you want to set a limit of 50% on inbound broadcast traffic for port 3, you can first enter interface context for port
3 and then execute the rate-limit command, as shown in Inbound broadcast rate-limiting of 50% on port 3
on page 163. Only 50% of the inbound broadcast traffic will be forwarded.
Inbound broadcast rate-limiting of 50% on port 3
switch(config)# int 3
switch(eth-3)# rate-limit bcast in percent 50
switch(eth-3)# show rate-limit bcast
Broadcast-Traffic Rate Limit Maximum %
Port | Inbound Limit Mode Radius Override
----- + ------------- --------- ---------------
1 | Disabled Disabled No-override
2 | Disabled Disabled No-override
3 | Disabled % No-override
4 | Disabled Disabled No-override
5 | Disabled Disabled No-override
If you rate-limit multicast traffic on the same port, the multicast limit is also in effect for that port, as shown in
Inbound multicast rate-limiting of 20% on port 3 on page 164. Only 20% of the multicast traffic will be
forwarded.
Chapter 6 Port Traffic Controls 163
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