Switch 7700 Configuration Guide

84 CHAPTER 5: ROUTING PROTOCOL OPERATION
By default, the dead interval for the neighboring routers of P2P or broadcast
interfaces is 40 seconds and for the neighboring routers of P2MP or NBMA
interfaces is 120 seconds.
Note that both hello and dead timers restore the default values if you modify the
network type.
Configure an Interval Required for Sending LSU Packets
Trans-delay seconds should be added to the aging time of the LSA in an LSU
packet. Setting the parameter like this mainly considers the time duration that the
interface requires for transmitting the packet.
You can configure the interval for sending LSU messages. Obviously, more
attention should be paid to this item over low speed network.
Perform the following configuration in VLAN interface view.
By default, LSU packets are transmitted by seconds.
Set an Interval for LSA Retransmission Between Neighboring Routers
If a router transmits an LSA to the peer, it requires the acknowledgement packet
from the peer. If it does not receive the acknowledgement packet within the
retransmission, it retransmits this LSA to the neighbor. You can configure the value
of the retransmission interval.
Perform the following configuration in VLAN interface view.
By default, the interval for neighboring routers to retransmit LSAs is five seconds.
The value of the interval should be bigger than the interval in which a packet can
be transmitted and returned between two routers.
Restore the default dead interval of
the neighboring routers
undo ospf timer dead
Tab le 31 Configure an Interval for LSU packets
Operation Command
Configure an interval for
sending LSU packets
ospf trans-delay seconds
Restore the default interval of
sending LSU packets
undo ospf trans-delay
Tab le 32 Set Retransmit Timer
Operation Command
Configure the interval of LSA
retransmission for the
neighboring routers
ospf timer retransmit interval
Restore the default LSA
retransmission interval for the
neighboring routers
undo ospf timer retransmit
Table 30 Set a Dead Timer for the Neighboring Routers
Operation Command