By Brent Stewart; Denise Donohue; Jay Swan
ISBN-10: 1587053276
ISBN-13: 9781587053276
Read or Download CCNP quick reference sheets bundle: exams 642-901, 642-812, 642-845, 642-825 PDF
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Additional info for CCNP quick reference sheets bundle: exams 642-901, 642-812, 642-845, 642-825
Example text
For example, voice is best with an end-to-end delay of 150 ms or less. If the latency in the LAN at each site is 25 ms, then your latency SLA with the ISP should be no more than 100 ms. Enterprise QoS Each block within an enterprise network has its own QoS needs and considerations. In general, you should: n Classify and mark traffic as close to the access edge as possible. Switches that can accomplish this in hardware are more efficient than routers that must do it in software. n Establish the correct trust boundaries.
Traffic Shaping Traffic shaping also controls the amount of traffic sent out an interface, but shaping buffers excess traffic instead of dropping it. Because data is usually bursty, the buffered traffic can be sent out between bursts. Thus, shaping smoothes out the flow of traffic. This also results in fewer packet drops, and thus fewer TCP retransmits. It does, however, introduce some delay for traffic that must be buffered. It does not support remarking traffic. If all the tokens are not used within the interval, they can accrue and remain available to future packets if bursting is enabled.
Router(config)#policy-map NBAR Router(config-pmap)#class VOIP Router(config-pmap-c)#set ip dscp ef Router(config-pmap-c)#class Exams Router(config-pmap-c)#set ip dscp 31 Router(config-pmap-c)#class eDonkey Router(config-pmap-c)#set ip dscp 13 TABLE 4-1 ! IP Precedence/CoS Name Router(config-pmap-c)#int gi 0/0 7 Network 6 Internet 5 Critical 4 Flash-override 3 Flash 2 Immediate 1 Priority 0 Routine Router(config-if)#service-policy input NBAR This classifies and marks the traffic and uses NBAR to identify it.
CCNP quick reference sheets bundle: exams 642-901, 642-812, 642-845, 642-825 by Brent Stewart; Denise Donohue; Jay Swan
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