Avaya Configuring PPP Services Manual de usuario descargar pdf (Pagina 97)

Customizing PPP

308639-14.00 Rev 00

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Viewing Line Statistics for Multilink Circuits

To view the statistics that PPP collects for multilink circuits, use the Technician

Interface software to access the PPP MIB. For instructions on how to use this

software, refer to Using Technician Interface Software. Appendix C lists the PPP

multilink statistics and describes the data that they record. The key statistics to

check are the following:

•In the wfPppCircuitEntry MIB:

-- wfPppCircuitMlFragPerm indicates that fragmentation is enabled.

-- wfPppCircuitMlFragTriggerSize indicates the smallest-size packet that

PPP may fragment.

-- wfPppCircuitMaxBuffers is the maximum allowable number of buffers for

this circuit.

-- wfPppCircuitMaxLinks is the maximum number of links allowed in the

multilink bundle for this circuit at any one time.

•In the wfPppMlStatsEntry MIB:

-- wfPppMlStatsReSeqBufferCnt is the current count of packets (not

fragments) that the receiver has buffered because they arrived out of order.

To analyze the effects of fragmentation, periodically observe this value

under a typical traffic load without fragmentation enabled on the peer

router, and then observe the value with fragmentation enabled on the peer

router. Typically, this number is higher in configurations with greatly

differing line speeds. This number should go down when fragmentation is

enabled. If this number is constantly at or near the maximum number of

buffers allowed, as indicated in wfPppCircuitMaxBuffers, reset the

maximum number of buffers allowed to a higher number. In addition, the

higher the value of wfPppCircuitMaxLinkss, the more likely it is you’ll

need to increase wfPppCircuitMaxBuffers.

-- wfPppMlStatsReSeqBufferMax is the maximum that

wfPppMlStatsReSeqBufferCnt ever reached.

-- wfPppMlStatsNumPktsFragmented counts the number of packets that

have been fragmented (transmit only). This indicates how often the router

judges that fragmentation is necessary.

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Avaya Configuring PPP Services Manual de usuario Pagina 97