Nov
08
Abstract This publication discusses the spectrum of problems associated with transporting Constant Bit Rate (CBR) circuits over packet networks, specifically focusing VoIP services. It provides guidance on practical calculation for voice bandwidth allocation in IP networks, including the maximum bandwidth proportion allocation and LLQ queue settings. Lastly, the publication discusses the benefits and drawbacks of transporting CBR flows over packet switched networks and demonstrates some... Read More
Oct
17
Computing voice bandwidth is usually required for scenarios where you provision LLQ queue based on the number of calls and VoIP codec used. You need to account for codec rate, Layer 3 overhead (IP, RTP and UDP headers) and Layer 2 overhead (Frame-Relay, Ethernet, HDLC etc. headers). Accounting for Layer 2 overhead is important, since the LLQ policer takes this overhead in account when enforcing maximum rate. Read More
Aug
17
Try assessing your understanding of Cisco's CBWFQ by looking at the following example: class-map match-all HTTP_R6 match access-group name HTTP_R6 ! policy-map CBWFQ class HTTP_R6 bandwidth remaining percent 5 ! interface Serial 0/1 bandwidth 128 clock rate 128000 service-policy output CBWFQ and answering a question on the imaginable scenario: Two TCP flows (think of them as HTTP file transfers) are going across Serial 0/1 interface. One of the flows matches the class HTTP_R6, and another flow,... Read More

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