Reserving A Connection For Voip And Video Traffic - HP 7102dl - ProCurve Secure Router Configuration Manual

Reserving a Connection for VoIP and Video Traffic

You could use PBR to reserve a connection for VoIP and video conferencing
traffic, which require low latency. You could also reserve a connection for
mission-critical traffic.
For example, an organization uses cost-effective Frame Relay connections
between its headquarters and branch offices. The branch offices exchange
data with servers at the headquarters over these connections.
Employees at the headquarters and at one of the branch offices frequently use
VoIP to communicate. Employees at the two sites also occasionally participate
in video conferences. When the Frame Relay network is congested, the QoS
for this real-time traffic is seriously degraded. The organization decides to
install a PPP connection between the headquarters and this branch office. You
could configure PBR on the headquarters and branch office WAN routers to
reserve this connection for the real-time traffic.
This example explains how to configure PBR on the branch office router. You
would consider these issues:
How will the router distinguish between the real-time traffic and other
traffic?
If the VoIP and video applications mark real-time traffic with a QoS value,
you can use this value to select the traffic. Otherwise, you could configure
an extended ACL to select traffic destined to UDP real time protocol
(RTP) ports. In this example, the applications mark traffic with an IP
precedence of 5.
How will the router forward the real-time traffic?
In this example, the routing protocol implemented on the ProCurve
Secure Router has selected the Frame Relay connection to route traffic
to the headquarters. You can override this selection for real-time traffic.
All real-time traffic is destined for the headquarters, so it can be routed
out the PPP interface that connects to the headquarters.
Does the traffic need any other special treatment?
In this example, the headquarters network uses DiffServ. The branch
office router can mark real-time packets with the DSCP for the EF PHB.
The branch office router can also set the DF bit for the packets so that
intervening routers will not fragment them.
IP Routing—Configuring RIP, OSPF, BGP, and PBR
Configuring Policy-Based Routing
15-147