Cisco ISE Software Configuration Guide - Page 20

Software Configuration of ATM ISE Line Cards for Cisco 12000 Series Routers How to Configure Layer 3 Terminated VCs on the 4-Port ATM ISE Line Card Step 9 Command or Action Purpose random-detect dscp dscpvalue min-threshold {cells | packets} max-threshold {cells | packets} [mark-probability-denominator] Specifies the minimum and maximum cell thresholds and, optionally, the mark-probability denominator for the DSCP value. Example: Router(config-pmap-c)# random-detect dscp 1 300 cells 700 cells 1 Specify cells for egress and packets for ingress. Note Use this step to configure DSCP-based WRED. Step 10 exit Step 11 exit Step 12 interface atmslot/port.subifnum Exits policy-map class mode. Exits policy-map mode. Specifies the ATM subinterface to configure. Step 13 Example: Router(config)# interface atm1/0.1 pvc vpi/vci Specifies the ATM PVC to attach the policy map to. Step 14 Example: Router(config-subif)# pvc 1/1 service-policy output policy-name Attaches the policy map to the PVC. Example: Router(config-if-atm-vc)# service-policy output wred-1 Configuring Per-VC MDRR and Low Latency Queueing This task configures egress MDRR. Using egress MDRR, the 4-Port ATM ISE line card supports up to eight queues for classes of traffic per VC. One of the queues is always reserved for a special class called class-default. Up to seven of the classes are normal queues, including the class-default queue. The eighth class is always a low latency queue. The class, class-default, is always configured, and it consumes one of the eight queues. If not configured explicitly, it is configured implicitly. When the bandwidth command is used, at least 1 percent of traffic must be reserved for the class-default queue. All packets that do not match any user-defined class on the policy map are considered to belong to class-default, and therefore enter the default queue. The low latency queue, or priority queue, is also always created. All traffic sourced from the router (including ping traffic and multicast traffic) uses this queue, regardless of classification. Bandwidth percentages are converted into weights in units of ATM cells. The weights are internally proportioned such that the bandwidth is divided accurately among VCs. The following are recommendations for configuring per-VC MDRR on the 4-Port ATM ISE line card: • Set the bandwidth to be at least 10 percent in each class. The default class, class-default, should also have at least 10 percent of the bandwidth allocation; therefore, you should ensure that the bandwidth allocated to all configured classes is less that 90 percent. Cisco IOS Release 12.0(27)S 20