Implementing Pbr To Route Probe Traffic - HP 7102dl - ProCurve Secure Router Configuration Manual

Network Monitoring
Configuring Network Monitoring
9-34
See the Basic Management and Configuration Guide, Chapter 6: Configur-
ing the Data Link Layer Protocol for E1, T1, and Serial Interfaces and the
Basic Management and Configuration Guide, Chapter 8: Configuring
Demand Routing for Primary ISDN Modules for more information.
Just as a DHCP server can send a default route, the far end of the PPP
connection can also send a default route with the IP address. When you decide
to allow your router to accept that route, it is often a good idea to monitor the
route, ensuring that it remains the best default route for your system.
To configure the router to monitor a negotiated default route, from the PPP
or demand interface configuration mode context, enter:
Syntax: ip address negotiated track <name> [<administrative distance>]
Replace <name> with the appropriate track's name.
The same considerations for setting the administrative distance that are
documented in the previous section apply.

Implementing PBR to Route Probe Traffic

You must use PBR to route probe traffic. This requirement is particularly
important when you use probes to test routes to ensure that probe packets
are always forwarded over the route in question.
If you do not create a PBR route map for probe packets, the router forwards
them to their destination according to its routing table. This behavior is
undesirable because the routing table may change based on the results of
network monitoring, but you always want a probe to use the route that you
have configured it to test.
Figure 9-3 shows the correct way to route traffic: network traffic is routed
according to the routing table, but probe traffic is always sent over the primary
connection.