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Configuring Policing on an ATM IMA Pseudowire

This topic includes the following tasks:

1. Configuring an Input Policer
2. Configuring the ATM IMA Interface

Configuring an Input Policer

1. Define the ATM IMA pseudowire. For information about defining the ATM IMA pseudowire, seeConfiguring Inverse Multiplexing for ATM (IMA).
2. In configuration mode, go to the [edit firewall] hierarchy level:
   [edit]user@host# edit firewall
3. Define the policer:
   [edit firewall]user@host# edit atm-policer atm-policer-name

   The following steps describe the ATM policer options that you can configure. The options include: atm-service, cdvt, logical-interface-policer, max-burst-size, peak-rate, policing-action, and sustained-rate.

4. Specify the ATM service category:
   [edit firewall atm-policer atm-policer-name]user@host# set atm-service (cbr | nrt-vbr | rt-vbr | ubr)

   Select one of the following service categories, depending on the policing needs of your network: constant bit rate (cbr), nonreal-time variable bit rate (nrtvbr), real-time variable bit rate (rtvbr), and unspecified bit rate ubr. All service categories must include the peak-rate and cdvt statements for the configuration to work. The peak-rate statement limits the maximum traffic allowed and the cdvt statement ensures that the configuration functions correctly.

5. Apply limits to the traffic flow by configuring the cell delay variation tolerance (cdvt), from 1 microsecond through 1,800,000,000 microseconds:
   [edit firewall atm-policer atm-policer-name]user@host# set cdvt cdvt-time
6. (Optional) Define the policer as a logical interface policer:
   [edit firewall atm-policer atm-policer-name]user@host# set logical-interface-policer

   The logical interface policer is associated with the interface on which the policer is applied. To configure the policer on multiple interfaces, you must apply this policer on each interface explicitly.

7. (Optional) Define the maximum number of cells that a burst of traffic can contain, from 1 through 4000 cells:
   [edit firewall atm-policer atm-policer-name]user@host# set max-burst-size max-burst-size
8. Apply limits to the traffic flow by specifying the largest number of cells per second that the policer processes before it drops packets, from 61 cells per second (cps) through 38,641 cps:
   [edit firewall atm-policer atm-policer-name]user@host# set peak-rate peak-rate

   The maximum peak rate value depends on the number of links in the IMA bundle—the more links, the higher the possible peak rate.

9. Define the policing-action parameter to set a consequence for the packets that exceed the traffic limits:
   [edit firewall atm-policer atm-policer-name]user@host# set policing-action (discard | discard-tag | count)
10. Define the normal traffic rate averaged over time, from 61 cps through 38,641 cps):
    [edit firewall atm-policer atm-policer-name]user@host# set sustained-rate cps

After you have configured policing, enter the commit command from configuration mode.

Configuring the ATM IMA Interface

1. In configuration mode, go to the [edit interfaces] hierarchy level:
   [edit]user@host# edit interfaces
2. Define the ATM interface:
   [edit interfaces]user@host# edit at-fpc/pic/port
3. Specify the ATM interface unit:
   [edit interfaces at-fpc/pic/port]user@host# edit unit logical-unit-number
4. Apply the ATM policer:
   [edit interfaces at-fpc/pic/port unit logical-unit-number]user@host# set atm-policer input-atm-policer policer-name
5. Specify the encapsulation family type:
   [edit interfaces at-fpc/pic/port unit logical-unit-number]user@host# set family ccc

After you have configured the ATM IMA interface, enter the commit command from configuration mode.