Enterprise QoS Solution Reference Network Design Guide

WAN Edge Link-Specific QoS Design
3-36
Enterprise QoS Solution Reference Network Design Guide
Chapter 3 WAN Aggregator QoS Design
vbr-nrt 256 256 ! Voice ATM PVC definition
tx-ring-limit 3 ! Per-PVC Tx-ring is tuned to 3 particles
precedence 5 ! Only IPP5 traffic (voice) can use this PVC
no bump traffic ! Traffic will not be accepted from other PVCs
protect vc ! Optional: Protects VC status of Voice PVC
!
vc-class atm DATA-PVC-512 ! Data PVC-class definition
ubr 512 ! Data ATM PVC definition
tx-ring-limit 3 ! Per-PVC Tx-ring is tuned to 3 particles
precedence other ! All other IPP values (data) use this PVC
!
…
!
interface ATM3/0
no ip address
no atm ilmi-keepalive
!
interface ATM3/0.60 point-to-point
ip address 10.200.60.1 255.255.255.252
bundle BRANCH#60
pvc-bundle BRANCH60-DATA 0/60
class-vc DATA-PVC-512 ! Assigns PVC to data-class
service-policy output WAN-EDGE-DATA-PVC ! Attaches (data) MQC policy to PVC
pvc-bundle BRANCH60-VOICE 0/600
class-vc VOICE-PVC-256 ! Assigns PVC to voice-class
!
A major drawback to PVC bundling is that data never can get access to the voice PVC, even if there is
available bandwidth in it. This forces suboptimal consumption of WAN bandwidth.
Verification commands:
show policy map
show policy-map interface
show atm pvc
show atm vc
show atm bundle
Verification Command: show atm vc
The show atm vc command details the configured ATM PVCs and highlights their encapsulation, ATM
traffic contracts (or service contracts), status, and activity, as shown in Example 3-28.
Example 3-28 show atm vc Verification of ATM PVC Definitions and Activity
WAN-AGG-7200#show atm vc
VCD / Peak Avg/Min Burst
Interface Name VPI VCI Type Encaps SC Kbps Kbps Cells Sts
3/0.60 BRANCH60-DATA 0 60 PVC SNAP UBR 512 512 1145 UP
3/0.60 BRANCH60-VOICE 0 600 PVC SNAP VBR 256 256 94 UP
WAN-AGG-7200#
Version 3.3