Voip Over PPP Links With Qos Mohammad ali kordmostafapour.

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Presentation transcript:

Voip Over PPP Links With Qos Mohammad ali kordmostafapour

For desigin Qos on ppp links we use of this Methods : 1 – LLQ Method strict priority for voice traffic.

LLQ Configuration Guidelines 1-Create a Class Map for VoIP Traffic Router(config)#class-map match-all voice-traffic Router(config-cmap)#match access-group 102 Router(config)#access-list 102 permit udp any any range Create a Class Map for VoIP Signaling class-map voice-signaling match access-group 103 access-list 103 permit tcp any eq 1720 any access-list 103 permit tcp any any eq 1720 H.323/H.225 = TCP Create a Policy Map and Associate to the VoIP Class-Maps Router(config)#policy-map VOICE-POLICY Routerconfig-pmap)#class voice-traffic Router(config-pmap-c)#priority ?

Router(config-pmap)#class voice-signaling Router(config-pmap-c)#bandwidth 8 Router(config-pmap)#class class-default Router(config-pmap-c)#fair-queue 4- Enable LLQ: Apply the Policy Map to the Outbound WAN Interface Router(config)#interface multilink 1 Router(config-if)#service-policy output VOICE-POLICY

Link Fragmentation and Interleaving (LFI): Multilink PPP While 1500 bytes is a common size for data packets, a typical VoIP packet (carrying G.729 voice frames) can be around 66 bytes (20 bytes voice payload, 6 bytes layer-2 header, 20 bytes RTP & UDP header, and 20 Bytes IP header). Now, imagine a 56Kbps leased line link where voice and data traffic coexist. If a voice packet is ready to be serialized just when a data packet starts being transmitted over the link, then there is a problem. The delay-sensitive voice packet will have to wait 214 msec before being transmitted (it takes 214 msec to serialize a 1500 bytes packet over a 56Kbps link). The link fragment size is configurable in millisecond (msec) time measurements with the command ppp multilink fragment-delay. LFI requires that ppp multilink be configured on the interface with ppp multilink interleave turned on.

Compressed Real-time Protocol (cRTP) Based on RFC 2508, the RTP header compression feature compresses the IP/UDP/RTP header from 40 Bytes to 2 or 4 bytes, reducing unnecessary bandwidth consumption. It is a hop-by-hop compression scheme; therefore, cRTP must be configured on both ends of the link (unless the passive option is configured). To configure cRTP, use the following command at interface level: Router(config-if)#ip rtp header-compression

Sample Configurations Class-map match-all voice-signaling match access-group 103 class-map match-all voice-traffic match access-group 102 policy-map VOICE-POLICY class voice-traffic priority 48 class voice-signaling bandwidth 8 class class-default fair-queue interface Multilink1 ppp multilink service-policy output VOICE-POLICY ip tcp header-compression iphc-format ppp multilink fragment-delay 10 ppp multilink interleave ip rtp header-compression iphc-format

access-list 102 permit udp any any range access-list 103 permit tcp any eq 1720 any access-list 103 permit tcp any any eq 1720 interface Serial0/0 encapsulation ppp ppp multilink multilink-group 1