interfaces <interface> <interface-name> ip ospf transmit-delay <delay>
Sets the OSPF transmission delay for an interface.
Link-state transmissions occur at one-second intervals.
- interface
- A type of interface. For detailed keywords and arguments that can be specified as interface types, refer to Supported Interface Types.
- interface-name
- The name of an interface.
- delay
- The delay, in seconds, between link-state transmissions. This delay must be the same for all nodes on the network. The delay ranges from 1 through 65535. The default delay is 1 second.
Configuration mode
interfaces {
interfaces interface-name {
ip {
ospf {
transmit-delay delay
}
}
}
}
Use this command to set the OSPF transmission delay for an interface. This delay is the estimated time required to send an LSU packet.
This timer accommodates transmission and propagation delays on the network, particularly on low-speed networks in which delays may be significant. The router increments the age of link-state advertisements (LSAs) in link-state update (LSU) packets to account for these delays.
The delay includes both the transmission time and the propagation delay across the network. The delay is added to the age of the LSA packet before the LSA is transmitted. The LSA age helps the network sequence LSAs, so that it can determine which of competing LSAs is the more recent and trustworthy.
LSAs are numbered in sequence, but the sequence numbers are finite, and so cannot be used as the sole determinant of the most recent LSA. Instead, OSPF also tracks the age of LSAs. Each time an LSA is forwarded to another router, its current age is incremented by the transmission delay. The age of the packet, together with its sequence number, help the receiving router to determine which version of a received LSA is more recent and, therefore, to be used.
Use the set form of this command to set the OSPF transmission delay for an interface.
Use the delete form of this command to restore the default OSPF transmission delay, which is one second, for an interface.
Use the show form of this command to display the OSPF transmission delay for an interface.