Foundry NetIron M2404C and M2404F Metro Access Switches
Configuring Advanced Routing Information (Rev. 03)
Open Shortest Path First (OSPF)
© 2008 Foundry Networks, Inc
Page 26 of 68
device-name
(config-router)#
area 0 range 192.42.110.0/24
Configuring the Shortcutting Area
The
area shortcut
command, in Router OSPF Configuration mode, configures and manages the
area shortcutting mode. The
no
form of this command disables the area shortcutting.
The OSPF traffic between different areas passes through the backbone area. Using the
area
shortcut
command, the OSPF traffic is allowed to pass through non-backbone area.
By default, the shortcutting is set for use only when there is no connection to the backbone area –
area shortcut default
.
Command Syntax
device-name
(config-router)#
area
{<
area-id
> |
A.B.C.D
}
shortcut
{
enable
|
disable
|
default
}
device-name
(config-router)#
no area
{<
area-id
> |
A.B.C.D
}
shortcut
{
enable
|
disable
}
Argument Description
area-id
OSPF area ID as a decimal value in the range <0-4294967295>.
A.B.C.D
OSPF area ID in IP address format.
enable
Always use shortcutting through the area.
disable
Disables shortcutting through the area.
default
Use area shortcutting only if there is no connection to the backbone area.
Establishing a Virtual Link through a Transit Area
The
area virtual link
command, in Router OSPF Configuration mode, establishes a virtual link
through the specified transit area. To remove the virtual link definitions, use the
no
form of this
command.
In OSPF, all areas must be connected to a backbone area. If the backbone continuity is broken, or
if the backbone is intentionally partitioned, the user can establish a virtual link. The two end points
of a virtual link are Area Border Routers (ABRs). The virtual link must be configured in both
routers. The configuration information in each router consists of the remote ABR (at the opposite
virtual endpoint), and the non-backbone area that is common to the two routers (called the transit
area). Note that virtual links cannot be configured through stub areas.
Command Syntax
device-name
(config-router)#
area
{<
area-id
> |
A1.B1.C1.D1
}
virtual-link
A2.B2.C2.D2
device-name
(config-router)#
area
{<
area-id
> |
A1.B1.C1.D1
}
virtual-link
A2.B2.C2.D2
{
authentication-key PASSWORD
|
message-digest-key
<
key-id
>
md5 PASSWORD
}
device-name
(config-router)#
area
{<
area-id
> |
A1.B1.C1.D1
}
virtual-link
A2.B2.C2.D2 hello-interval
<
hello-interval
>
retransmit-interval
<
retransmit-interval
>
transmit-delay
<
transmit-delay
>
dead-interval
<
dead-interval
>
[
authentication-key PASSWORD
|
message-digest-key
<
key-
id
>
md5 PASSWORD
]