To change the MD5 authentication configured on an interface, re-execute the command with the new MD5
key.
Use
show ip ospf interface
ip-address
to view the current authentication setting.
NOTE:
To replace the MD5 method with the password method on a given interface, overwrite the MD5
configuration by using the password form of the command shown in the next syntax description. (It is
not necessary to disable the currently configured OSPF MD5 authentication.)
Default: Disabled
Configuring a virtual link
For information about virtual links, see
Configuring an ABR to use a virtual link to the backbone
on page
261.
Syntax:
ip ospf area
area-id
virtual link
ip-address
Used on a pair of ABRs at opposite ends of a virtual link in the same area to configure the virtual link connection.
area-id
This must be the same for both ABRs in the link and is the area number of the virtual link transit area in either
decimal or dotted decimal format.
ip-address
On an ABR directly connected to the backbone area, this value must be the IP address of an ABR (in the
same area) needing a virtual link to the backbone area as a substitute for a direct physical connection.
On the ABR that needs the virtual link to the backbone area, this value must be the IP address of the ABR (in
the same area) having a direct physical connection to the backbone area.
Example
Figure 37: Defining OSPF virtual links within a network
on page 217 shows an OSPF ABR, routing switch "A"
that lacks a direct connection to the backbone area (area 0.) To provide backbone access to routing switch "A,"
you can add a virtual link between routing switch "A" and routing switch "C," using area 1 as a transit area.
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Aruba 3810 / 5400R Multicast and Routing Guide for ArubaOS-
Switch 16.08
