Cabletron Systems SMARTSWITCH ROUTER 9032578-05 - Manual (Page 331)

SmartSwitch Router User Reference Manual 305
Chapter 21: QoS Configuration Guide
To define a port rate limit policy, enter one of the following commands in Configure mode:
Note that for output port policies, the only action that you can specify if traffic exceeds the
specified rate is to drop packets.
If you configure output port policies, all types of outgoing IP traffic will be rate limited,
including control traffic. If you do not want control traffic to be subject to rate limiting,
enter the following command in Configure mode:
Because you specify a slot number in the above command, output port rate limiting
policies on any port on the specified slot will not be applied to control traffic.
Aggregate Rate Limiting
Use an aggregate rate limiting policy if an aggregation of flows needs to be limited to a
particular rate. For example, you can use aggregate rate limiting to rate limit traffic to or
from a particular subnet.
Note: You cannot apply an aggregate rate limiting policy to an interface that spans ports
on more than one line card. For example, you cannot apply an aggregate rate
limiting policy to the interface ‘ip2,’ if ‘ip2’ interfaces to a VLAN that consists of
ports et.1.(1-4) and et.2.(1-4).
To configure aggregate rate limiting policies, you must first enable aggregate rate limiting
mode on the SSR (see
“Rate Limiting Modes” on page 303 ).
Define a port rate limit policy to
limit incoming traffic on a port. rate-limit port-level input rate
port { drop-packets|no-
action|lower-priority|lower-priority-
except-control|tos-precedence-rewrite
|tos-precedence-rewrite-lower-
priority }
Define a port rate limit policy to
limit outgoing traffic on a port. rate-limit port-level output port
rate drop-packets
Specify that control traffic is not
subject to output port rate
limiting. rate-limit port-level slot
number> ignore-control-priority