Alcatel Carrier Internetworking Solutions 060187-10 REV D 사용자 설명서

Configuring OSPF

Configuring OSPF

OmniSwitch 6600 Family Advanced Routing Configuration Guide

page 1-25

A virtual link is a link between two backbones through a transit area. Use the 

command to create or delete a virtual link. 

Accepted network design theory states that virtual links are the option of last resort. For more information 
on virtual links, see 

 and refer to the figure on 

To create a virtual link, commands must be submitted to the routers at both ends of the link. The router 
being configured should point to the other end of the link, and both routers must have a common area. 

When entering the 

 command, it is necessary to enter the Router ID of the far end of 

the link, and the area ID that both ends of the link share. 

For example, a virtual link needs to be created between Router A (router ID 1.1.1.1) and Router B (router 
ID 2.2.2.2). We must:

1 Establish a transit area between the two routers using the commands discussed in 

 (in this example, we will use Area 0.0.0.1). 

2 Then use the ip ospf virtual-link command on Router A as shown:

ip ospf virtual-link 0.0.0.1 2.2.2.2

3 Next, enter the following command on Router B:

ip ospf virtual-link 0.0.0.1 1.1.1.1

Now there is a virtual link across Area 0.0.0.1 linking Router A and Router B. 

4 To display virtual links configured on a router, enter the following show command:

show ip ospf virtual-link

5 To delete a virtual link, enter the ip ospf virtual-link command with the area and far end router infor-
mation, as shown:

no ip ospf virtual-link 0.0.0.1 2.2.2.2

There are several parameters for a virtual link (such as authentication type and cost) that can be modified 
at the time of the link creation. They are described in the 

 command description.These 

parameters are identical in function to their counterparts in the section 

.