TRAFFIC MANAGEMENT

  1. Queuing is the primary method of traffic management on a Cisco router. Traffic is placed in buffers and then handled based on the instructions the router has been configured for.

  2. First-in first-out (FIFO) and weighted fair queuing (WFQ) require little in the way of configuration, primarily handling traffic in the same first-in, first-out fashion. Priority queuing (PQ); custom queuing (CQ); and derivatives such as low-latency queuing, priority-queue weighted fair queuing, and class-based weighted fair queuing can differentiate between types of traffic and treat specific packets with a higher priority.

  3. WFQ is the default on most interfaces with bandwidth equal to or less than an E1, 2.048Mbps. The exceptions are interfaces using X.25 or compressed PPP.

  4. Advanced queuing methods combine PQ or CQ with WFQ to give high precedence to traffic with a low tolerance for delay, such as VoIP.

  5. Frame Relay can prioritize traffic on a per-PVC (permanent virtual circuit) basis through DLCI identification, whereas a DDR circuit brings up the link based on what is considered interesting traffic.



CCNP BCRAN Remote Access Exam Cram 2 (Exam Cram 640 - XXX)
CCNP BCRAN Remote Access Exam Cram 2 (Exam Cram 640 - XXX)
ISBN: N/A
EAN: N/A
Year: 2003
Pages: 183

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