Avaya G250 Administration page 563

Application example
Figure 53: Sample policy-based routing application on page 563 illustrates the sample
application described below.
Figure 53: Sample policy-based routing application
This example includes a voice VLAN (6) and a data VLAN (5). The PMI is on VLAN 6. The
G250/G350 is managed by a remote Media Gateway Controller (MGC) with the IP address
149.49.43.210. The G250/G350 also includes a local S8300 in LSP mode.
IP phones are located on the same subnet as the PMI. Therefore, there is no routing between
the PMI and the IP phones.
In this example, the object of policy-based routing is to route all voice traffic over the E1/T1 line,
which is more expensive but provides the superior QoS necessary for voice traffic. Remaining
traffic is to be routed over the more inexpensive Internet connection.
It is assumed that the IP phones on VLAN 6 establish connections with other IP phones on the
same subnet, sending signalling packets to the MGC, and bearer packets directly to other IP
phones or to the G250/G350.
The policy-based routing configuring starts with PBR list 801. This list requires all voice packets
addressed to the MGC (149.49.43.210) with DSCP values that indicate voice transmission (34,
41, 43, 44, and 46) to be routed according to next hop list 1. This list directs packets to the T1/
E1 interface (Serial 4/1). If that interface is down, the packets are dropped.
In this example, it is important to include the destination IP address in each rule. This is
because without the destination address, calls from IP phones on VLAN 6 to a Softphone on
VLAN 5 will be routed by the PBR list to the E1/T1 line, rather than being sent directly to VLAN
5 via the G250/G350.
Issue 3 February 2007 563