3com 3031 Instruccion De Instalación
508
C
HAPTER
40: OSPF C
ONFIGURATION
Disabling the Interface
to Send OSPF Packets
To prevent OSPF routing information from being acquired by the routers on a
certain network, use the
certain network, use the
silent-interface
command to disable the interface to
transmit OSPF packets.
Different processes can disable the same interface to forward OSPF packet; while
the
the
silent-interface
command is only valid for the OSPF interface where the
specified process has been enabled, with no effect to the interface with other
processes.
processes.
Perform the following in the OSPF View.
By default, all the interfaces are allowed to transmit and receive OSPF packets.
After an OSPF interface is set to be in silent status, the interface can still advertise
its direct route. However, the OSPF hello packets of the interface will be blocked,
and no neighboring relationship can be established on the interface. Thereby, the
capability for OSPF to adapt to the networking can be enhanced, which will hence
reduce the consumption of system resources.
its direct route. However, the OSPF hello packets of the interface will be blocked,
and no neighboring relationship can be established on the interface. Thereby, the
capability for OSPF to adapt to the networking can be enhanced, which will hence
reduce the consumption of system resources.
Configuring STUB Area
of OSPF
The Stub area, a type of OSPF area, does not receive or advertise Type-5 LSAs. The
Stub area is often at the AS border and can effectively minimize the LSDB size of
the routers in the Stub area and lower resource occupation for SPF calculation.
Stub area is often at the AS border and can effectively minimize the LSDB size of
the routers in the Stub area and lower resource occupation for SPF calculation.
To secure the correct forwarding of the packets from the Stub area to the externa
network, the ABR in the Stub area will advertise a default route through the
Type-3 LSAs and the default route will be spread withinthe area.
network, the ABR in the Stub area will advertise a default route through the
Type-3 LSAs and the default route will be spread withinthe area.
The ABR advertises inter-area default routes through Type-3 LSA.
Please pay attention to the following items when configuring a STUB area:
■
The backbone area cannot be configured to be the STUB area.
■
The virtual link cannot pass through the STUB area.
■
If you want to configure an area to be the STUB area, then all the routers in this
area should be configured with this attribute.
area should be configured with this attribute.
■
ASBR cannot exist in a STUB area. In other words, routers outside an AS cannot
be transmitted in the local area.
be transmitted in the local area.
Perform the following configuration in OSPF area view.
Table 585 Enabling/disabling the interface to send IS-IS packets
Operation
Command
Disable the interface to send OSPF packets
silient-interface interface-type
interface-number
interface-number
Enable the interface to send OSPF packets
undo silent-interface
interface-type interface-number
interface-type interface-number
Table 586 Configuring STUB area of OSPF
Operation
Command
Configure an area to be the STUB area
stub [ no-summary ]
Remove the configured STUB area
undo stub