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Virtual Interface Configuration
Virtual Interfaces are used by OSPF to link areas that do not have a physical connection to the
backbone (also called Area 0) or to link areas of the backbone itself that are discontinuous. This allows
routing information to flow from an area that is physically disconnected from area 0 into area 0 by
configuring an interface across one of the areas previously defined above.
To configure an OSPF Virtual Interface, highlight Virtual Interface Configuration and press Enter.
Note that the Hello Interval (Hello-Intv.), Dead Interval (Dead-Intv.), and Authorization Type (Auth.
Type) must be the same for the Transit Area and the remote area's Neighbor Router.
The following fields can be set:
Figure 6-47. Virtual Interface Configuration screen
Parameter
Action:<Add/Modify
>
Transit Area
ID:[
]
Neighbor Router ID:[
]
DES-3326 Layer 3 Fast Ethernet Switch User's Guide
Description
This field can be toggled using the
space bar between Add/Modify and
Delete. Add/Modify allows for the
creation of a new OSPF Virtual
Interface or changes to an existing
OSPF Virtual Interface. Delete allows
for the deletion of an existing OSPF
Virtual Interface.
Allows the entry of an OSPF Area ID
− previously defined on the switch −
that
allows
a
remote
communicate
with
(area 0). A Transit Area cannot be a
Stub Area or a Backbone.
The OSPF router ID for the remote
router. This is a 32-bit number in
the
form
of
an
(xxx.xxx.xxx.xxx)
identifies the remote area's Area
Border Router.
130
area
to
the
backbone
IP
address
that
uniquely
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