3Com Switch 7750 Configuration Guide

OSPF Network Adjustment and Optimization 319
■ After an OSPF interface is set to be in silent status, the interface can still
advertise its direct route. However, the Hello packets from the interface will be
blocked, and no neighboring relationship can be established on the interface.
This enhances OSPF networking adaptability, thus reducing the consumption of
system resources.
Configuring OSPF
Authentication
n
■ OSPF supports packet authentication and receives only those packets that are
successfully authenticated. If packet authentication fails, no neighboring
relationship will be established.
■ The authentication modes for all routers in an area must be consistent. The
authentication passwords for all routers on a network segment must also be
consistent.
Configuring to Fill the
MTU Field When an
Interface Transmits DD
Packets
By default, an interface uses value 0 instead of its actual MTU value when
transmitting DD packets. After the following configuration, the actual MTU value
of the interface is filled in the Interface MTU field of the DD packets.
Table 246 Configure OSPF authentication
Operation Command Description
Enter system view system-view -
Enter OSPF view ospf [ process-id
[ router-id router-id ]]
-
Enter OSPF area view area area-id -
Configure the authentication mode
of the OSPF area
authentication-mode { s
imple | md5 }
Required
By default, no
authentication mode is
configured for an area.
Return to OSPF view quit -
Return to system view quit -
Enter interface view interface interface-type
interface-number
-
Configure the authentication mode
of the OSPF interface
ospf
authentication-mode { s
imple password | md5
key-id key }
Required
By default, OSPF packets
are not authenticated on
an interface.
Table 247 Configure to fill the MTU field when an interface transmits DD packets
Operation Command Description
Enter system view system-view -
Enter Ethernet interface view interface interface-type
interface-number
-
Enable the interface to fill in
the MTU field when
transmitting DD packets
ospf mtu-enable Required
By default, the MTU value is 0
when an interface transmits
DD packets. That is, the actual
MTU value of the interface is
not filled in.