Quality of Service guidelines
320 Avaya Application Solutions IP Telephony Deployment Guide
Queuing methods
This section discusses common queuing methods and their appropriateness for voice:
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WFQ
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PQ
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Round-robin
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CB-WFQ / LLQ / CBQ
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RED / WRED
WFQ
Weighted fair queuing (WFQ) is similar to first in, first out (FIFO) queuing, except that it grants a
higher weight to small flows, and flows that are marked with higher DiffServ or IP TOS priorities.
This queuing strategy does allow smaller (for example, telnet) and higher-priority (for example,
IP Telephony) protocols to squeeze in before high-flow (for example, ftp) packets, but does not
starve off any traffic. By itself, it is not appropriate for IP Telephony traffic because high-flow
traffic can still delay IP Telephony traffic, and cause unacceptable latency and jitter.
PQ
Strict priority queuing (PQ) divides traffic into different queues. These queues are usually high,
medium, normal, and low, based on traffic type. This form of queuing services the queues in
order of priority, from high to low. If there is a packet in the high-priority queue, it will always be
serviced before the queue manager services the lower-priority queues. With priority queuing,
however, it is possible to starve out lower-priority flows if sufficient traffic enters the
high-\priority queue. This mechanism works very well for IP Telephony traffic (where IP
Telephony bearer and signaling are inserted in the high-priority queue), but might work less well
for routine data traffic that is starved out if sufficient high-priority traffic arrives.
Содержание Application Solutions
Страница 1: ...Avaya Application Solutions IP Telephony Deployment Guide 555 245 600 Issue 3 4 1 June 2005 ...
Страница 20: ...About This Book 20 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 21: ...Issue 3 4 1 June 2005 21 Section 1 Avaya Application Solutions product guide ...
Страница 22: ...22 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 74: ...Avaya Application Solutions platforms 74 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 106: ...Call processing 106 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 124: ...Avaya LAN switching products 124 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 139: ...Issue 3 4 1 June 2005 139 Section 2 Deploying IP Telephony ...
Страница 140: ...140 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 186: ...Traffic engineering 186 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 204: ...Security 204 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 214: ...Voice quality network requirements 214 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 228: ...Avaya Integrated Management 228 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 239: ...Reliability Issue 3 4 1 June 2005 239 Figure 69 S8700 Media Server in a high reliability configuration ...
Страница 274: ...Reliability and Recovery 274 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 275: ...Issue 3 4 1 June 2005 275 Section 3 Getting the IP network ready for telephony ...
Страница 276: ...276 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 350: ...Implementing Communication Manager on a data network 350 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 356: ...Network recovery 356 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 366: ...Network assessment offer 366 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 367: ...Issue 3 4 1 June 2005 367 Appendixes ...
Страница 368: ...Appendixes 368 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 394: ...Access list 394 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 414: ...DHCP TFTP 414 Avaya Application Solutions IP Telephony Deployment Guide ...