Dell PowerConnect FCS624S Configuration Guide - Page 658

18 ACL-based rate limiting using traffic policies TABLE 108 ACL based adaptive rate limiting parameters Parameter Definition Committed Information Rate (CIR) Committed Burst Size (CBS) Peak Information Rate (PIR) Peak Burst Size (PBS) 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. 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 rate-limit adaptive cir cbs pir pbs exceed-action [count] Syntax: access-list permit | deny.... traffic policy Syntax: [no] ip access-group 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 PowerConnect B-Series FCX Configuration Guide 53-1002266-01