Enterprise QoS Solution Reference Network Design Guide

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WAN Edge Link-Specific QoS Design 3-42 Enterprise QoS Solution Reference Network Design Guide Chapter 3 WAN Aggregator QoS Design cRTP is supported only over ATM links (through MLPoATM), as of Cisco IOS Release 12.2(2)T. Slow-Speed (£ 768 kbps) ATM-FR SIW Links Recommendation: Use MLPoATM and MLPoFR. Use MLP LFI and optimize fragment sizes to minimize cell padding. cRTP can be used only in Cisco IOS Release 12.2(2)T or later. Tune the ATM PVC Tx-ring to 3. As with any slow-speed WAN media, serialization delay must be addressed with a fragmentation and interleaving mechanism. As previously mentioned, FRF.12 is not an option for SIW links. Therefore, MLP LFI must be used. Generally, MLP LFI requires no additional calculations to configure, but a special case exists when interworking ATM and FR (as illustrated in Figure 3-19) because of the nature of ATM’s fixed cell lengths. Figure 3-19 Slow-Speed ATM-FR SIW Links WAN Edge Router When enabling MLPoATM, the fragment size should be optimized so that it fits into an integral number of cells. Otherwise, the bandwidth required could double because of cell padding. For example, if a fragment size of 49 bytes is configured, this fragment would require 2 cells to transmit (because ATM cells have 48-byte payloads). This would generate 57 bytes of overhead (2 cell headers plus 47 bytes of cell padding), which is more than double the fragment itself. Table 3-3 provides a summary of the optimal fragment-delay parameters for MLPoATM. A slow-speed ATM-to-Frame Relay SIW configuration is shown next, in two parts: The central site WAN aggregator MLPoATM configuration (see Example 3-34) The remote branch router MLPoFR configuration (see Example 3-35) Example 3-34 MLPoATM WAN Aggregator ATM-FR SIW QoS Design Example ! interface ATM4/0 no ip address ATM Link 768 kbps ATM Cloud Frame Relay Cloud Frame Relay Link 768 kbps Branch Router Table 3-3 Optimal Fragment-Delay Values for MLP LFI for MLPoATM Optimal Fragment ATM Cells ppp multilink PVC Speed Size (Rounded Up) fragment-delay value 56 kbps 84 bytes 2 12 ms 64 kbps 80 bytes 2 10 ms 128 kbps 176 bytes 4 11 ms 256 kbps 320 bytes 7 10 ms 512 kbps 640 bytes 14 10 ms 768 kbps 960 bytes 21 10 ms Version 3.3
Chapter 3 WAN Aggregator QoS Design Version 3.3 WAN Edge Link-Specific QoS Design no atm ilmi-keepalive ! interface ATM4/0.60 point-to-point pvc BRANCH#60 0/60 vbr-nrt 256 256 ! ATM PVC definition tx-ring-limit 3 ! Per-PVC Tx-ring is tuned to 3 particles protocol ppp Virtual- Template60 ! Enables MLPoATM ! interface Virtual-Template60 bandwidth 256 ip address 10.200.60.1 255.255.255.252 service-policy output WAN-EDGE ! Attaches MQC policy to Virtual-Template ppp multilink ppp multilink fragment-delay 10 ! Enables MLP fragmentation ppp multilink interleave ! Enables MLP interleaving ! Verification commands: show policy map show policy-map interface show atm pvc show ppp multilink Example 3-35 MLPoFR Remote-Branch Router ATM-FR SIW QoS Design Example ! interface Serial6/0 description Parent FR Link for BRANCH#60 no ip address encapsulation frame-relay frame-relay traffic-shaping ! interface Serial6/0.60 point-to-point description FR Sub-Interface for BRANCH#60 bandwidth 256 frame-relay interface-dlci 60 ppp Virtual-Template60 ! Enables MLPoFR class FRTS-256kbps ! Binds the map-class to the FR DLCI ! interface Virtual-Template60 bandwidth 256 ip address 10.200.60.2 255.255.255.252 service-policy output WAN-EDGE ! Attaches MQC policy to map-class ppp multilink ppp multilink fragment-delay 10 ! Enables MLP fragmentation ppp multilink interleave ! Enables MLP interleaving ! … ! map-class frame-relay FRTS-256kbps frame-relay cir 243200 ! CIR is set to 95% of FR DLCI rate frame-relay bc 2432 ! Bc is set to CIR/100 frame-relay be 0 ! Be is set to 0 frame-relay mincir 243200 ! MinCIR is set to CIR ! Verification commands: show policy map Enterprise QoS Solution Reference Network Design Guide 3-43
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