Configuring Ospf Timers - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
Table 4-15 Set OSPF route preference
Configure a preference for OSPF to
compare with the other routing protocols
Restore the default protocol preference
By default, the OSPF preference is 10, and the redistributed external routing protocol is
150.

4.2.13 Configuring OSPF Timers

I. Setting the interval of Hello packet transmission
Hello packets are a kind of most frequently used packets, which are periodically sent to
the adjacent router for discovering and maintaining the adjacency, and for electing DR
and BDR. The user can set the value of "seconds", the interval for sending a hello
packet.
According to provisions in RFC2328, it is necessary to keep consistency of the hello
timer between network neighbors. Note that the value of hello timer is inversely
proportional to route convergence speed and network load.
Perform the following configuration in interface view.
Table 4-16 Set the interval of hello packet transmission
Set the hello interval of the interface
Restore the default hello of the interface
Set the poll interval on the NBMA
interface
Restore the default poll interval
By default, p2p and broadcast interfaces send Hello packets every 10 seconds; while
p2mp and NBMA interfaces send Hello packets every 30 seconds.
By default, poll timer is 40 seconds.
You are recommended to set the poll timer longer than the hello timer.
II. Setting dead time for the neighboring routers
If a router receives no hello packet from its neighbor in a certain time, the neighbor
router is regarded invalid. This time interval is called dead time between neighboring
routers.
Operation
Operation
3Com Corporation
4-20
Chapter 4 OSPF Configuration
Command
preference [ ase ] preference
undo preference [ ase ]
Command
ospf timer hello seconds
undo ospf timer hello
ospf timer poll seconds
undo ospf timer poll