Filter
Top Products
Configuring On-Demand Routing
IPC-198
Cisco IOS IP Configuration Guide
Other CDP features are described in the Cisco IOS Configuration Fundamentals Configuration Guide,
in the “Monitoring the Router and Network” chapter.
Using ODR with Dialer Mappings
For interfaces that specify dialer mappings, CDP packets will make use of dialer map configuration
statements that pertain to the IP protocol. Because CDP packets are always broadcast packets, these
dialer map statements must handle broadcast packets, typically through use of the dialer map broadcast
keyword. The dialer string interface configuration command may also be used.
On DDR interfaces, certain kinds of packets can be classified as interesting. These interesting packets
can cause a DDR connection to be made or cause the idle timer of a DDR interface to be reset. For the
purposes of DDR classification, CDP packets are considered uninteresting. This classification occurs
even while CDP is making use of dialer map statements for IP, where IP packets are classified as
interesting.
Command Purpose
Step 1
Router(config)# cdp timer seconds
Changes the rate at which CDP updates are sent.
Step 2
Router(config)# router odr
Enables ODR.
Step 3
Router(config-router)# timers basic update invalid
holddown flush [sleeptime]
Changes the rate at which ODR routes are expired
from the routing table.