barcode in excel 2003 Setting the IP Precedence Bits in Software

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Setting the IP Precedence Bits
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On Cisco devices, IP Precedence bits can be set using any of the following: Policy-based routing (PBR) Allows setting the IP Precedence bits based on extended access lists; can even choose different routes based on these matches QoS policy propagation via the Border Gateway Protocol (PB-BGP) For use on large internetworks, PB-BGP allows IP Precedence bits to be set based on BGP communities, BGP autonomous systems paths, and access lists
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Committed access rate (CAR) Can be used to classify as well as handle IP packets Classification is based on matching traffic to extended access lists For our example, we'll use CAR to classify the IP Precedence bits, and then use it again to handle the packets
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We first want to make an access list that will identify the traffic for which we want to set the IP Precedence bits For example, to give a single user the IP Precedence bit value of 7 for Web traffic, we'd start by identifying this user based on IP address (101110): Router(config)#access-list 101 permit tcp 101110 any eq www The next step is to set the IP Precedence bits on all traffic that matches access group 101 First we set the interface to control, and then set up CAR to use the access group to set the IP Precedence bits Router(config)#interface ethernet 0 Router(config-if)#rate-limit output access-group 101 10000000 56000 56000 conform-action set-prec-transmit 7 exceed-action drop Now when a user from 101110 attempts to connect to port 80 (the Web) through this device, the user will be identified as matching access group 101 The rate-limit command tells the router to set the IP Precedence bit to 7 provided the user does not exceed the throughput of 10 Mbps (with an average and allowable burst rate set to 56 Kbps) If the traffic does exceed 10 Mbps, then the action is to drop the packet
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Controlling Traffic Based on IP Precedence Bits
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For other network devices, we'll want them to see the IP Precedence bits that we set at the data ingress and handle them appropriately We can use CAR to do this, as well Since we don't want all the network devices to be setting the IP Precedence bits, we only need to match the access list to the bits already in the header and then proceed First, we create an access list to identify each level of service Router(config)#access-list 101 permit tcp any any precedence 7 This identifies all TCP traffic carrying the IP Precedence bit of 7 as belonging to the access group 101 Then we create a rate-limit statement to match this traffic and apply a policy to it, again on a specific interface Router(config-if)#rate-limit output access-group 101 5000000 56000 56000 conform-action transmit exceed-action drop This policy states that traffic with IP Precedence of 7 gets transmitted as long as it doesn't consume more than 5 Mbps with an allowable burst of 56 Kbps If the traffic doesn't conform, it will be dropped Note that the first 56000 in this example identifies the normal burst; the second 56000 sets the maximum burst NoteSince there are many possible forms of the rate-limit command, and an almost limitless variation of applications, you should consult Cisco documentation before implementing any policies (See wwwciscocom, then go to documentation | IOS commands | QoS)
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A future classification model is called Differentiated Services, or DiffServ for short Like the Resource Reservation Protocol (explained later in this chapter), DiffServ isn't a concept but rather a technology being developed under the auspices of an IETF working group DiffServ, also called soft QoS, is meant to provide a relatively coarse but simple way to prioritize traffic DiffServ is a superset of the IP Precedence/CBQ mechanism, using a more sophisticated encoding scheme to mark packets DiffServ does this by redefining the original IP ToS field bits into its own scheme, in which two of the eight ToS bits are used for congestion notification, and the remaining six bits for packet markings This new scheme implements so-called codepoints within the six bits of marking space Packets are marked for DiffServ class as they enter the DiffServ QoS network DiffServ attempts only to control so-called "per-hop" behaviors In other words, policy is defined locally and DiffServ as a mechanism executes within a device to influence when the packet's next hop will occur and to where Once policy is set across a toplogy, everything takes place within a device DiffServ supports two service levels (traffic classes): Expedited forwarding (EF) Minimizes delay and jitter Packets are dropped if traffic exceeds maximum load threshold set by local policy Assured forwarding (AF) Provides for four subclasses and three drop-precedence codepoints within each subclass, for a total of twelve codepoints If traffic load exceeds local policy, excess AF packets are not delivered at the specified priority Instead, they are demoted to a lower priority (but not dropped) This demotion procedure cascades through any configured drop-precedence codepoints
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