Dell PowerConnect B-FCXs Configuration Manual page 658

18
ACL-based rate limiting using traffic policies
TABLE 108
Parameter
Committed Information Rate (CIR)
Committed Burst Size (CBS)
Peak Information Rate (PIR)
Peak Burst Size (PBS)
If a port receives more than the configured bit or byte rate in a one-second interval, the port will
either drop or forward subsequent data in hardware, depending on the action you specify.
To implement the ACL-based adaptive rate limiting feature, first create a traffic policy, and then
reference the policy in an extended ACL statement. Lastly, bind the ACL to an interface. Complete
the following steps.
1. Create a traffic policy. Enter a command such as the following.
2. Create a new extended ACL entry or modify an existing extended ACL entry that references the
3. Bind the ACL to an interface. Enter commands such as the following.
The previous commands configure an adaptive rate limiting policy that enforces a guaranteed
committed rate of 10000 kbps on port e7 and allows bursts of up to 1600 bytes. It also enforces a
peak rate of 20000 kbps and allows bursts of 4000 bytes above the PIR limit. If the port receives
additional bits during a given one-second interval, the port drops all packets on the port until the
next one-second interval starts.
Syntax: [no] traffic-policy <TPD name> rate-limit adaptive cir <cir value> cbs <cbs value> pir <pir
Syntax: access-list <num> permit | deny.... traffic policy <TPD name>
Syntax: [no] ip access-group <num> in
NOTE
For brevity, some parameters were omitted from the access-list syntax.
The software allows you to add a reference to a non-existent TPD in an ACL statement and to bind
that ACL to an interface. The software does not issue a warning or error message for non-existent
TPDs.
616
ACL based adaptive rate limiting parameters
PowerConnect(config)#traffic-policy TPDAfour rate-limit adaptive cir 10000 cbs
1600 pir 20000 pbs 4000 exceed-action drop
traffic policy. Enter a command such as the following.
PowerConnect(config)#access-list 104 permit ip host 210.10.12.2 any
traffic-policy TPDAfour
PowerConnect(config)#interface ethernet 7
PowerConnect(config-if-e7)#ip access-group 104 in
PowerConnect(config-if-e7)#exit
value> pbs <pbs value> exceed-action <action> [count]
Definition
The guaranteed kilobit rate of inbound traffic that is allowed on a port.
The number of bytes per second allowed in a burst before some packets will
exceed the committed information rate. Larger bursts are more likely to
exceed the rate limit. The CBS must be a value greater than zero (0). Dell
recommends that this value be equal to or greater than the size of the
largest possible IP packet in a stream.
The maximum kilobit rate for inbound traffic on a port. The PIR must be
equal to or greater than the CIR.
The number of bytes per second allowed in a burst before all packets will
exceed the peak information rate. The PBS must be a value greater than
zero (0). Dell recommends that this value be equal to or greater than the
size of the largest possible IP packet in the stream.
PowerConnect B-Series FCX Configuration Guide
53-1002266-01