3Com 8807 Configuration Manual page 321

Configuring the
Network Type of the
OSPF Interface
Table 287 Set a dead timer for the neighboring routers
Operation
Configure a dead timer for the neighboring routers
Restore the default dead interval of the neighboring routers undo ospf timer dead
By default, the dead interval for the neighboring routers of p2p or broadcast
interfaces is 40 seconds and that for the neighboring routers of p2mp interfaces is
120 seconds.
Note that both hello and dead timer will restore to the default values after the user
modify the network type.
Setting an interval for LSA retransmission between neighboring routers
If a router transmits a Link State Advertisements (LSA) to the peer, it requires the
acknowledgement packet from the peer. If it does not receive the
acknowledgement packet within the retransmit time, it will retransmit this LSA to
the neighbor. The value of retransmit is user-configurable.
Perform the following configuration in interface view.
Table 288 Set an interval for LSA retransmission between neighboring routers
Operation
Configure the interval of LSA retransmission
for the neighboring routers
Restore the default LSA retransmission interval
for the neighboring routers
By default, the interval for neighboring routers to retransmit LSAs is 5 seconds.
The value of interval should be bigger than the roundtrip value of a packet.
Note that you should not set the LSA retransmission interval too small. Otherwise,
unnecessary retransmission will be caused.
The route calculation of OSPF is based upon the topology of the adjacent network
of the local router. Each router describes the topology of its adjacent network and
transmits it to all the other routers.
OSPF divides networks into four types by link layer protocol , but due to ethernet
media type, 3Com supports the Broadcast domain only. OSPF uses the network
type, broadcast.
Perform the following configuration in interface view.
Table 289 Configure a network type for an OSPF interface
Operation
Configure the network type on the interface
Restore the default network type of the OSPF
interface
Configuring OSPF
Command
ospf timer dead seconds
Command
ospf timer retransmit interval
undo ospf timer retransmit
Command
ospf network-type { broadcast | nbma |
p2mp | p2p }
undo ospf network-type
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