Release 1.0
Configuring OSPF
526360-001-00 Rev. B
MGBI
11-11
Managing OSPF on the BSR
This section discusses the following optional OSPF tasks:
■
■
Assign a Default Route for an ASBR
■
Controlling OSPF Link Cost Metrics
■
Allowing Dynamic OSPF Virtual Links
■
Changing OSPF Administrative Distances
■
Configuring Route Calculation Timers
■
Establishing a Virtual Link
In OSPF, all areas must be connected to a backbone area. If there is a break in
backbone continuity or the backbone is purposefully partitioned, you can establish a
virtual link. The two endpoints 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 other virtual endpoint (the other ABR), and the non-backbone
area that the two routers have in common (the transit area).
Choose from the following options to establish a virtual link that connects an OSPF
area to the backbone area (area 0.0.0.0) without being physically connected to the
OSPF backbone area:
■
Use the
area virtual-link
command in Router Configuration mode if you want to
configure an OSPF virtual link that contains the default parameters for the
hello-interval
,
retransmit-interval
,
transmit-delay
,
dead-interval
,
authentication-key
, and
message-digest-key
parameters:
MOT
(config-ospf)#
area
{<
0-4294967295
> | <
A.B.C.D
>}
virtual-link
<
A.B.C.D
>
where:
0-4294967295
is the OSPF area IP address or number.
Note:
Virtual links cannot be configured through stub areas.
Содержание BSR 2000
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