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Layer 4 Switching Configuration: Congestion Management
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Congestion management configuration is a bit trickier than SLB configuration Like you learned earlier in the "How Layer 4 Switching Works: Congestion Management" section of the chapter, congestion management encompasses several queuing strategies, each with their own way of performing tasks This section examines configuration tasks for WFQ, CBWFQ, CQ, and PQ Again, assume that basic configuration has already been performed
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Luckily, WFQ is mostly automatic, so you need to do very little to enable and configure this queuing strategy In fact, if you have a router interface running at 2048 Mbps or less, WFQ is already enabled by default Note WFQ is set per interface or ATM PVC WFQ is not supported on interfaces with the following encapsulations: Link Access Procedure Balanced (LAPB), X25, and Synchronous Data Link Control (SDLC) Configuring WFQ actually consists of entering a single command fair-queue [congestive discard threshold] [dynamic queues] [reservable queues] in interface config mode for the interface for which you wish to configure WFQ The only mandatory part of this command is fair-queue All other sections are optional The congestive discard threshold section is the number of messages each queue will hold After reaching this number of packets, the queue is full and new packets are dropped The range for the congestive discard threshold option is from 16 to 4096 in powers of 2, and the default setting is 64 The dynamic queues setting controls how many queues are allowed in WFQ By default, this figure is calculated based on the bandwidth of the interface For links at 64 Kbps or lower, WFQ uses 16 dynamic queues by default From 64 Kbps to 128 Kbps, 32 queues are used From 128 Kbps to 256 Kbps, 64 queues are used From 256 Kbps to 512 Kbps, 128 queues are used; and for any link over 512 Kbps, 256 queues are used by default The valid values for this setting are 16, 32, 64, 128, 256, 512, 1024, 2048, and 4096 Note ATM PVCs have different WFQ settings for each PVC The default settings for these queues are a bit different than for other interfaces Finally, the reserved queues option sets how many queues are reserved for RSVP packets The default setting is 0, and the valid range is from 0 to 1000 Tip Typically, the default settings for congestive discard and queues are fine In most cases, enabling extreme values for either of these settings does not help significantly, unless your link is either extremely slow or extremely fast As an example of WFQ configuration, the following command sets WFQ to set a congestive discard of 128 on all queues and allow up to 256 dynamic queues:
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3600 (config)# interface serial 0/0 3600 (config-if)# fair-queue 128 256
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Class-based WFQ is a bit more complicated to configure than standard WFQ Configuring CBWFQ basically consists of three steps: 1 Define and configure your class maps 2 Configure your class policy and policy maps
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3 Apply the policy map to an interface The first step in this process is to configure your class maps Class maps are the criteria that determine which packets will be assigned to a given class By building class maps, you are essentially defining the classes you will use to classify your traffic To build class maps, you use the class-map [name of class] command from global config mode This command enters you into class map config mode, as shown here:
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3600 (config)# class-map testclass 3600 (config-cmap)#
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You then assign types of packets to this class using the match command, which can be used to match packets based on protocol used, input interface (the interface on which the packet arrives), IP precedence, and access lists (discussed in 27) You choose which criteria to base the match on by using different targets in the match command Table 21-2 describes the common targets for the match command, with further explanations following the table Note You can match a class map using only one match command For instance, if you enter match access-group 1 and then enter match protocol ip, the only command that will be used is the last one typed, in this case, match protocol ip Therefore, most match commands are configured to use access lists, because each access list can be configured to match multiple items For more information on access lists, please refer to 27 The match access-group command can match packets based on specific (already configured) named or numbered access lists To use this command, from class map config mode, type the command followed by the appropriate named or numbered access list (For named access lists, you must specify the name subtarget) For instance, the following configuration matches packets based on access list 50:
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