3Com 7700 Configuration Manual page 91

broadcasting the Hello packets, you must manually specify an IP address for the
adjacent router for the interface, and whether the adjacent router is eligible for
election. This can be done by configuring the peer ip-address command. If
dr-priority-number is not specified, the adjacent router will be regarded as
ineligible.
Perform the following configuration in OSPF view.
Table 28 Configure the Peer
Operation
Configure a peer for the NBMA
interface.
Remove the configured peer for the
NBMA interface
By default, the preference for the neighbor of NBMA interface is 1.
Set the Interval of Hello Packet Transmission
Hello packets are the most frequently used packets, which are periodically sent to
the adjacent router for discovering and maintaining adjacency, and for electing a
DR and BDR. The user can set the hello timer.
According to RFC2328, the consistency of hello intervals between network
neighbors should be kept. The hello interval value is in inverse proportion to the
route convergence rate and network load.
Perform the following configuration in VLAN interface view.
Table 29 Set Hello Timer and Poll Interval
Operation
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, and
P2MP and NBMA interfaces send the packets every 30 seconds.
Set a Dead Timer for the Neighboring Routers
The dead timer of neighboring routers refers to the interval after which a router
considers a neighboring router dead if no hello packet is received from it. You can
set a dead timer for the neighboring routers.
Perform the following configuration in VLAN interface view.
Table 30 Set a Dead Timer for the Neighboring Routers
Operation
Configure a dead timer for the
neighboring routers
Command
peer ip-address [ dr-priority dr-priority-number ]
undo peer ip-address
Command
ospf timer hello seconds
undo ospf timer hello
ospf timer poll seconds
undo ospf timer poll
Command
ospf timer dead seconds
OSPF 83