Enterprise QoS Solution Reference Network Design Guide

Summary
Summary
3-46
Enterprise QoS Solution Reference Network Design Guide
Chapter 3 WAN Aggregator QoS Design
Example 3-36 Voice and Data over Multiple ISDN B Channels QoS Design Example
!
class-map match-all Voice
match ip dscp ef
!
class-map match-any Call Signaling
match ip dscp cs3
match ip dscp af31
!
…
!
policy-map WAN-EDGE-ISDN
class Voice
priority percent 70 ! LLQ 33% Rule is relaxed for DDR scenarios
compress header ip rtp ! Enables Class-Based cRTP
class Call Signaling
bandwidth percent 5 ! Bandwidth guarantee for Call-Signaling
class class-default
fair-queue
!
interface BRI0/0
encapsulation ppp
dialer pool-member 1
!
interface Dialer1
encapsulation ppp
dialer pool 1
dialer remote-name routerB-dialer1
dialer-group 1
dialer string 12345678
service-policy output WAN-EDGE-ISDN ! Attaches MQC policy to Dialer interface
ppp multilink
ppp multilink fragment-delay 10 ! Enables MLP fragmentation
ppp multilink interleave ! Enables MLP interleaving
ppp multilink links minimum 2 ! Activates both B Channels immediately
ppp multilink multiclass ! Enables MCMP
!
Verification commands:
show policy map
show policy-map interface
show ppp multilink
Note For a case study example of WAN Aggregator QoS design, refer to Figure 13-21 and Example 13-37 of
the Cisco Press book, End-to-End QoS Network Design by Tim Szigeti and Christina Hattingh.
This chapter discussed the QoS requirements of routers performing the role of a WAN aggregator.
Specifically, it addressed the need for queuing policies on the WAN edges, combined with shaping
policies when NBMA media (such as Frame Relay or ATM) are being used, and link-specific policies,
such as LFI/FRF.12 and cRTP, for slow-speed (£ 768 kbps) links.
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