
Customizing WAN SVC Service Records and WAN SVCs
308612-14.00 Rev 00
8-5
Changing the Routing Update Policy
With WAN SVCs, you can configure one or more adjacent hosts for each circuit.
The number of adjacent hosts that you configure determines the routing update
policy you should use.
If you configure one adjacent host, you should choose the dial-optimized routing
policy. When you choose dial-optimized routing, Site manager automatically sets
the RIP broadcast timers to 1 hour. You may want to change the RIP broadcast
timer to a high value (for example, 8 hours) so that SVCs are not established as
often. In this configuration, the router sends routing updates whenever a data
packet or a call from the other end causes ATM to establish an SVC to the
adjacent host. Setting the RIP broadcast timer to a high value ensures that ATM
establishes an SVC primarily because the router needs to transmit data.
If you configure more than one adjacent host, you should choose the normal
routing policy. When you choose the normal routing policy, Site Manager
automatically sets the RIP broadcast timers to 30 seconds. You can accept this
value or change it to a higher value so that SVCs are not established as often. In
this type of configuration, when the broadcast timer expires, ATM establishes any
nonexisting SVCs so that the router can send routing updates simultaneously to
each adjacent host.
For information on how to configure RIP timers for an IP interface, see
Configuring IP, ARP, RARP, RIP, and OSPF Services. For information on how to
configure RIP timers for an IPX interface, see Configuring IPX Services.
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