Network audit tool

In the case of a WAN aggregation router supporting over 100 Mbps of WAN circuits, as in the case of a WAG running one or more OC-3 ports (at 155 Mbps each), multiple Fast Ethernet connections can be used to connect to the WAG from the distribution-layer switch to achieve the same net effect.

The point is to bring back, as much as possible, the choke point into network audit tool and engage hardware queuing there instead of overwhelming the software-based policing and queuing policies within the WAN aggregation router.

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Network hardware discovery

It is extremely unlikely that the WAN aggregator will be serving anywhere close to a (combined) WAN circuit rate of 1 Gbps. Therefore, use one (or more) Fast Ethernet connection on the distribution-layer network hardware discovery to connect to the WAG so that not only is the aggregate traffic sent to the WAG limited (in 100 Mbps increments), but (because congestion points now are pulled back into the Catalyst switch, thus forcing queuing to engage on the FE switch port) the traffic also will be queued correctly within these limits (of 100 Mbps increments).

For example, a WAN aggregation router is supporting two DS3 WAN connections (totaling 90 Mbps of WAN circuit capacity). In this case, the distribution-layer switch port connecting to the WAG should be Fast Ethernet. Then, if more than 100 Mbps of traffic attempts to traverse the WAN, the Catalyst switch will engage queuing on the switch port and aggressively drop flows according to the defined application hierarchies. Only 100 Mbps of correctly queued traffic will ever be handed off to the WAG.

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Network tracking

A possible workaround to this limitation is to preset the port(s) to be used by SoftPhone within the application itself. In such a case, these ports would have to be matched discretely by ACL entries on the network tracking. Furthermore, each port being used for Call-Signaling also would require a discrete ACL entry.

However, even when all these ports are buttoned down and discrete ACLs are configured to match them, another limitation of the switch comes into play. Specifically, something can support policing in only 1-Mbps increments on Fast Ethernet ports. Such lax policing leaves a fairly large hole to allow unauthorized traffic that is mimicking Voice or Call-Signaling to be admitted onto the network.

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Software inventory tools

As previously mentioned, trusting end users and their PCs is generally a bad idea because software inventory tools or newer operating systems such as Windows XP and Linux make it relatively easy to set CoS or DSCP markings on PC NICs. Such markings can be set deliberately or even inadvertently. In either case, improperly set QoS markings could affect the service levels of multiple users within the enterprise and make troubleshooting a nightmare. Also, marking application traffic on server NICs has disadvantages (discussed in the previous section) that might make it preferable to treat these as untrusted devices.

Although client PCs and data center servers are related and complimentary, they also have unique considerations that affect their classification and marking policies, so they are examined individually next.

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It network assessment

Only the CIR and PIR values can be specified with percent, not the burst sizes; the burst sizes are configured in units of milliseconds. If the CIR is configured in percent, the PIR also must be. When the service-policy is attached to an interface, the CIR (and PIR, if configured) is determined as a percentage of the interface bandwidth. If it network assessment is changed, the CIR and PIR values and burst sizes automatically are recalculated using the new interface bandwidth value. For subinterfaces, the bandwidth of the main interface is used for the calculation. For ATM, the VC bandwidth is used; for Frame Relay, the CIR value of the PVC is used.

Scheduling is the process of deciding which packet to transmit next. Scheduling occurs when the interface is experiencing congestion, but also (unlike queuing) when the interface is not experiencing congestion (that is, there is still a decision, albeit a simple one, of which packet should be transmitted next, even if there is no congestion on the interface). If there is no congestion on the interface, packets are transmitted as they arrive. If the interface is experiencing congestion, queuing algorithms are engaged. However, the scheduler still has to decide which queue to service next

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Asset tracker software

RFC 2697 and RFC 2698 describe three-color policers, meaning that the packets can be colored to three separate values to indicate whether they conform to, exceed, or violate the policing conditions. The single-rate three-color marker and the two-rate three-color marker initially were implemented (in IOS Software Releases 12.2[2]T and 12.2[4]T, respectively) to operate in color-blind mode. This means that the policer assumes that the packet stream previously was uncolored. The RFCs also define a color-aware mode, which means that the policer assumes that some preceding entity already has colored the packet stream. At the time of this writing, the color-aware mode is available only in IOS Software Release 12.0.26S; it is not yet available in any 12.2T release.

Most networks contain a wide array of interfaces with asset tracker software. If absolute bandwidth rates are used in policing policies, the policy must be re-entered for each different interface size. This reduces policy modularity and makes policy management more cumbersome across the enterprise. It often is desirable to have an overall network policy in which, for example, FTP traffic is not to exceed 10 percent of the bandwidth on any interfaceregardless of absolute speed. This can be achieved using percentages in the policing statements. Thus, a single policy can be reused across many interfaces in the network

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Hardware inventory management

It is advantageous to police some applications at multiple levels. For example, it might be desirable to limit all TCP traffic to 10 Mbps, while at the same time limiting FTP traffic (which is a subset of TCP traffic) to no more than 1.5 Mbps. To achieve this nested policing requirement, hardware inventory management. can be used. Two-level hierarchical policing was introduced in IOS Software Release 12.1(5)T. Later, in Release 12.2.1(3)T, three-level hierarchical policing was introduced for the 7200 and 7500 platforms

The policer at the second level in the hierarchy acts on packets transmitted or marked by the policer at the first level. Therefore, the second level does not see any packets that the first level drops. The sum of packets that the lower-level policers see is equal to the sum of packets that the higher-level policer transmits or marks. This feature supports up to three nested levels

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Inventory manager software

The single-rate three-color marker/policer was a significant improvement for policers, in that it made allowance for temporary traffic bursts (as long as the overall average transmitted rate was equal to or below the CIR) and inventory manager software. However, the variation in the number of accumulated excess burst credits could cause a degree of unpredictability in traffic flows. To improve on this, a two-rate three-color marker/policer was defined in RFC 2698. This policer addresses the peak information rate (PIR), which is unpredictable in the RFC 2697 model. Furthermore, the two-rate three-color marker/policer allows for a sustainable excess burst (negating the need to accumulate credits to accommodate temporary bursts) and allows for different actions for the traffic exceeding the different burst values

The two-rate three-color policer also uses an algorithm with two token buckets, but the logic varies slightly. Instead of transferring unused tokens from one bucket to another, this policer has two separate buckets that are filled each second with two separate token rates. The first bucket is filled with the PIR number of tokens and the second bucket is filled with the CIR number of tokens. In this model, the Be works the same as the Bc, except for the PBS bucket (not the CBS bucket). This means that Be represents the peak limit of traffic that can be sent during a subsecond interval.

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Network asset management software

The Tx-ring is especially important on ATM links (including DSL), in which each PVC has a dedicated driver-level queue (Tx-ring) to ensure adherence to the ATM class-of-service traffic contract of the PVC. Default ATM Tx-rings are typically deep, containing 64 or more particles (typically, each particle is 576 bytes) to ensure that enough particles exist in the buffer to drive the PVC to its full bandwidth utilization. A shallow Tx-ring increases the number of interrupts and the wait states between the driver and the main CPU. Packets are downloaded from the Layer 3 queues to the driver for transmission, which is usually suboptimal at higher speeds.
On the other hand, a deep network asset management software can impact voice quality. For example, assume that a 50-packet burst of data passes through the LLQ system and into the FIFO Tx-ring. A voice packet then arrives and is packet number 51 for transmission. The LLQ no longer has the opportunity to prioritize it over the data packets. A shallow Tx-ring pushes packets back into LLQ, where prioritization and packet reordering can be accomplished before the packets are downloaded to the driver. Once in the driver level, the packets have a very short wait time until transmission.

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Network audit tool

Link Fragmentation and Interleaving (LFI) is a network audit tool technique to minimize serialization delay on slow (typically less than 768-kbps) WAN links. Essentially, LFI tools chop large data packets into smaller ones and interleave these data packet fragments with voice packets.
Packets that are assigned to the PQ inside LLQ might escape the fragmentation engine (the fragmentation engine is represented by the box labeled fragment). Therefore, traffic with large packet sizes (such as interactive video) should not be assigned to priority classes on slow-speed links (typically less than 768 kbps). For example, if one priority class is assigned to VoIP and another is assigned to interactive video on a 512-kbps link, whenever a 1500-byte video packet is scheduled for transmission, it will require 23 ms to serialize ((1500 x 8) / 512,000). This exceeds the per-hop latency target for voice (10 ms) and nearly consumes the entire one-way jitter allowance target of 30 ms. If a second 1500-byte IP/VC packet also is scheduled for transmission, voice conversations audibly will become degraded. Therefore, voice and interactive video never should be assigned dual-LLQ policies on link speeds less than 768 kbps.

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Network hardware discovery

A similar consideration must be given to the sum of all traffic assigned for all priority classes. It is important to remember the goal of convergence: to allow voice, video, and data to coexist transparently on a single network. If real-time applications dominate a network, as in the case of a dominantly provisioned LLQ (in which the priority classes have the lion's share of the bandwidth), data applications might fluctuate significantly in their network response times when voice/videoconference calls are made. This destroys the transparency of the converged network. User feedback consistently has reflected that most users prefer consistent (even if moderately slower) application response times over varying response times (as would occur if LLQs dominated WAN links). network hardware discovery testing has revealed a conservative rule of thumb for priority class provisioning, which is to limit the sum of all priority class traffic to no more than 33 percent of the WAN link's capacity. This 33 percent LLQ rule has been deployed widely and successfully

Because of the policing function within LLQ, it is important to accurately provision bandwidth required for voice calls. LLQ is a Layer 3 queuing mechanism and, as such, accounts for only Layer 3 packet bandwidth. (It does not take Layer 2 headers into account.) Furthermore, the Layer 3 bandwidth required by a voice call is determined by a number of factors. These factors include the codec used, the sampling size, and the compression techniques, such as cRTP (also known as RTP header compression). ABC has provided a voice bandwidth calculator to determine the correct bandwidth to provision in LLQ for voice calls

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