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32 Using Enterprise Edge Services

Enterprise Edge Networking Operations Guide P0910464 Issue 01

An administrator needs to reserve a block of UDP port numbers and configure them

as high priority in both Enterprise Edge and the remote router at the other end of the

WAN link. Enterprise Edge forces all of the admitted H.323 streams to fall into the

reserved port range by using a proprietary technique so that these H.323 voice

(video) packets can get high priority. This is completely transparent to the end

H.323 terminals.

See Appendix B: Setting Up Remote Routers on page 167 for additional

information on setting UDP port ranges for remote routers.

Note: If an administrator configures all routers in their corporate network

with the same reserved port numbers (both in and out), admitted H.323

streams can get end-to-end high priority. However, routers connected

to WAN links are more critical because they are typically the

bottlenecks.

You can set up best-effort traffic priorities through the web-based Unified Manager

by using the following filter criteria:

• Source IP address (with mask)

• Destination IP address (with mask)

• IP protocol ID (e.g. TCP, UDP, or ICMP)

• Source port range

• Destination port range

• Incoming TOS field

There are a total of 8 priority classes for best-effort traffic in Enterprise Edge. By

default, all best-effort traffic is sent to Class 5 (queue 5), with Class 1 the highest

and Class 8 the lowest in priority.

Admission Control

Enterprise Edge allows users to set a certain percentage of the WAN bandwidth for

premium traffic. This traffic takes strict priority over best-effort traffic. In this

version, H.323 (VoIP) flows need to pass the admission control process to be

treated as premium traffic.

For admission control, Enterprise Edge uses the WAN Premium Bandwidth

parameter. Specifically, for each H.323 flow, QoS performs admission control

using the negotiated coding algorithm. A flow is admitted as a premium flow if the

current total WAN premium usage plus the new flow is lower than the allocated

WAN premium bandwidth.

Otherwise, the flow is rejected and he flow is still delivered as best-effort traffic.

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Avaya EE Networking Guide de l'utilisateur Page 32