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11-14
Cisco ASDM User Guide
OL-16647-01
Chapter 11 Configuring Dynamic And Static Routing
Dynamic Routing
Edit OSPF Interface Advanced Properties
The Edit OSPF Interface Advanced Properties dialog box lets you change the values for the OSPF hello
interval, retransmit interval, transmit delay, and dead interval. Typically, you only need to change these
values from the defaults if you are experiencing OSPF problems on your network.
Fields
• Hello Interval—Specifies the interval, in seconds, between hello packets sent on an interface. The
smaller the hello interval, the faster topological changes are detected but the more traffic is sent on
the interface. This value must be the same for all routers and access servers on a specific interface.
Valid values range from 1 to 65535 seconds. The default value is 10 seconds.
• Retransmit Interval—Specifies the time, in seconds, between LSA retransmissions for adjacencies
belonging to the interface. When a router sends an LSA to its neighbor, it keeps the LSA until it
receives the acknowledgement message. If the router receives no acknowledgement, it will resend
the LSA. Be conservative when setting this value, or needless retransmission can result. The value
should be larger for serial lines and virtual links. Valid values range from 1 to 65535 seconds. The
default value is 5 seconds.
• Transmit Delay—Specifies the estimated time, in seconds, required to send an LSA packet on the
interface. LSAs in the update packet have their ages increased by the amount specified by this field
before transmission. If the delay is not added before transmission over a link, the time in which the
LSA propagates over the link is not considered. The value assigned should take into account the
transmission and propagation delays for the interface. This setting has more significance on very
low-speed links. Valid values range from 1 to 65535 seconds. The default value is 1 second.
• Dead Interval—Specifies the interval, in seconds, in which no hello packets are received, causing
neighbors to declare a router down. Valid values range from 1 to 65535. The default value of this
setting is four times the interval set by the Hello Interval field.
Modes
The following table shows the modes in which this feature is available:
Redistribution
The Redistribution pane displays the rules for redistributing routes from one routing process into an
OSPF routing process.
Firewall Mode Security Context
Routed Transparent Single
Multiple
Context System
• — • ——
Firewall Mode Security Context
Routed Transparent Single
Multiple
Context System
• — • ——