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DES-7200 Configuration Guide Chapter 4 OSPF
Configuration
4-23
Command Meaning
DES-7200 # configure terminal
Enter the global configuration mode.
DES-7200(config)# router ospf 1
Enter the routing protocol configuration
mode (currently RIP and OSPF are
supported)
DES-7200 (config-router)#
passive-interface interface-name
(Optional) Set the specified interface as a
passive interface.
DES-7200 (config-router)#
passive-interface default
(Optional) Set all the network interfaces
as the passive interfaces
DES-7200 (config-router)# end
Return to the privileged EXEC mode.
DES-7200 (config-router)# write
Save the configuration.
By default, all interfaces are allowed to receive/send the OSPF packets. To
re-enable the network interface to send the route information, you can use the no
passive-interface interface-id command. To re-enable all network interfaces, use
the keyword default.
4.2.17 Configuring the OSPF Fast Convergence
4.2.17.1 Configuring the OSPF Fast Hello
Enabling OSPF Fast Hello will accelerate OSPF neighbor detection and allow
quick detection of lost neighbors. OSPF Fast Hello can be enabled by specifying
"minimal" and "hello-multiplier" key words and "multiplier" parameter.
"Minimal" key word configures the dead interval to 1s, and "hello-multiplier"
configures the number of hello packets sent during that 1 second, thus providing
sub-second hello packets.
When Fast Hello feature is configured on the interface, the hello interval
advertised in the hello packets that are sent out this interface is set to 0. The hello
interval in the hello packets received over this interface is ignored.
No matter Fast Hello feature is enabled or not, the dead interval must be
consistent on a network segment. The hello-multiplier needs not to be the same
for the entire segment as long as at least one hello packet is received within the
dead interval.
Configure Fast Hello feature on the interface:
Command Function
DES-7200# configure terminal
Enter global configuration mode.
DES-7200(config)# ip routing
Enable routing (if it is disabled)
DES-7200(config)# interface
Enter interface configuration mode.