Category: QoS
Quality of service is the ability to provide different priority to different applications,
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users, or data flows, or to guarantee a certain level of performance to a data flow. For example, a required bit rate, delay, jitter, packet dropping probability and/or bit error rate may be guaranteed. Quality of service guarantees are important if the network capacity is insufficient, especially for real-time streaming multimedia applications such as voice over IP, online games and IP-TV, since these often require fixed bit rate and are delay sensitive, and in networks where the capacity is a limited resource, for example in cellular data communication. In the absence of network congestion, QoS mechanisms are not required.
-WIKI-
VoIP QoS tips and configuration in best practice
VoIP QoS tips and configuration in best practice Remember "QoS is ONLY happening, when congestion on the circuit". In general QoS is more useful…
How to calculate Burst value when you configure QoS policer
It’s hard to figure what is right value of burst traffic when you configure QoS policer. There is many different explanation on the Internet, but…
Cisco Tier OC12 configuration with CAR and RED
Below sample configuration shows 200Mbps Tier on OC12 configuration with CAR and RED. Interface POS 0/1 ip address x.x.x.x y.y.y.y no ip directed-broadcast encapsulation frame-relay…
How to read policy-map output
See below output of GigE link with 200M tier policy. Service-policy output: GIG-200M-output (338) Class-map: class-default (match-any) (10248225/0) 244292772806 packets, 122660063754689 bytes …
NBAR software down for Cisco router
Here is the link to get NBAR(Network Based Application Recognition) PDLM(Packet Description Language Modules) for CIsco gears http://www.cisco.com/cgi-bin/tablebuild.pl/pdlm
Optimize VOIP traffic with RTP compression and priority
Here is simple configuration for VOIP traffic makes more efficiently handling by WAN or Interconnect. Router-RTP-1(config)# class-map VOIP Router-RTP-1(config-cmap)# match protocol rtp Router-RTP-1(config)# policy-map VOIP_SHAPE…
Applying LFI on Multilink PPP for Real-Time Traffic(VOIP)
LFI stands for Link Fragmentation and interleaving is not of QoS mechanism. However, it is help for real-time traffic such as VOIP on small size…
VOIP QoS sample
1. Configure class map Cisco-QoS#conf t Cisco-QoS(config)#class-map EF Cisco-QoS(config-cmap)#match ip precedence 5 Cisco-QoS#sh class-map EF Class Map match-any EF (id 1) Match ip …
Basic QoS
Tweet There are 4 priority queues: high, medium, normal, low. The default queue is the normal queue, by default. The high and medium queues…
CAR(Committed Access Rate) ?
Tweet Committed Access Rate (CAR) is used to rate limit traffic. In this example, all ICMP traffic that exceeds the defined level will be dropped….
Random Early Detection (RED)?
Tweet Random Early Detection (RED) is a congestion avoidance mechanism that takes advantage of TCP’s congestion control mechanism. When it comes to Quality of Service,…
[Cisco] How to limit a rate on interface ?
Tweet The command ‘rate-limit’ is interface configuration command. It is used to setup a committed access rate (CAR) and distributed CAR (DCAR) policies. To remove…
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