cisco qos--How Are Conversation Numbers Allocated?
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http://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-congestion-avoidance/10107-showpolicy.html
This section explains how your router allocates conversation numbers for the queues created when the service policy is applied.
Router# show policy-map interface s1/0.1 dlci 100 Serial1/0.1: DLCI 100 - output : mypolicy Class voice Weighted Fair Queueing Strict Priority Output Queue: Conversation 72 Bandwidth 16 (kbps) Packets Matched 0 (pkts discards/bytes discards) 0/0 Class immediate-data Weighted Fair Queueing Output Queue: Conversation 73 Bandwidth 60 (%) Packets Matched 0 (pkts discards/bytes discards/tail drops) 0/0/0 mean queue depth: 0 drops: class random tail min-th max-th mark-prob 0 0 0 64 128 1/10 1 0 0 71 128 1/10 2 0 0 78 128 1/10 3 0 0 85 128 1/10 4 0 0 92 128 1/10 5 0 0 99 128 1/10 6 0 0 106 128 1/10 7 0 0 113 128 1/10 rsvp 0 0 120 128 1/10 Class priority-data Weighted Fair Queueing Output Queue: Conversation 74 Bandwidth 40 (%) Packets Matched 0 Max Threshold 64 (packets) (pkts discards/bytes discards/tail drops) 0/0/0 Class class-default Weighted Fair Queueing Flow Based Fair Queueing Maximum Number of Hashed Queues 64 Max Threshold 20 (packets)
The class-default class is the default class to which traffic is directed, if that traffic does not satisfy the match criteria of other classes whose policy is defined in the policy map. The fair-queue command allows you to specify the number of dynamic queues into which your IP flows are sorted and classified. Alternately, your router allocates a default number of queues derived from the bandwidth on the interface or VC. Supported values in either case are a power of two, in a range from 16 to 4096.
This table lists the default values for interfaces and for ATM permanent virtual circuits (PVCs):
Default Number of Dynamic Queues as a Function of Interface BandwidthBased on the number of reserved queues for weighted fair queuing, Cisco IOS assigns a conversation or queue number as shown in this table:
Confirming Your Service Policy
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