Dell PowerConnect B-FCXs, Руководство по настройке

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616 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
ACL-based rate limiting using traffic policies
18
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.
PowerConnect(config)#traffic-policy TPDAfour rate-limit adaptive cir 10000 cbs
1600 pir 20000 pbs 4000 exceed-action drop
2. Create a new extended ACL entry or modify an existing extended ACL entry that references the
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
3. Bind the ACL to an interface. Enter commands such as the following.
PowerConnect(config)#interface ethernet 7
PowerConnect(config-if-e7)#ip access-group 104 in
PowerConnect(config-if-e7)#exit
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
value> pbs <pbs value> exceed-action <action> [count]
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.
TABLE 108 ACL based adaptive rate limiting parameters
Parameter Definition
Committed Information Rate (CIR) The guaranteed kilobit rate of inbound traffic that is allowed on a port.
Committed Burst Size (CBS) 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.
Peak Information Rate (PIR) The maximum kilobit rate for inbound traffic on a port. The PIR must be
equal to or greater than the CIR.
Peak Burst Size (PBS) 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.