ESR service routers. ESR-Series. Functionality description. Version 1.12.0
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5.3.4 Virtual link configuration example
Objective:
Merge two backbone areas using virtual link.
Solution:
Virtual link is a specialized connection that allows you to merge a split zone or connect a zone to the backbone
zone trough the third zone. Virtual link is configured between two Area Border Routers (ABR).
Pre-configure OSPF protocol and IP addresses on interfaces according to the network structure shown in
figure
.
For R1 router, proceed to 1.1.1.1 area configuration mode:
esr(config-ospf)# area
1.1
.
1.1
Create and enable virtual link with the identifier 0.0.0.3:
esr(config-ospf-area)# virtual-link
0.0
.
0.3
esr(config-ospf-vlink)# enable
For R3 router, proceed to 1.1.1.1 area configuration mode:
esr(config-ospf)# area
1.1
.
1.1
Create and enable virtual link with the identifier 0.0.0.1:
esr(config-ospf-area)# virtual-link
0.0
.
0.1
esr(config-ospf-vlink)# enable
Review the routing table on R1 router:
esr# show ip route
C *
10.0
.
0.0
/
24
[
0
/
0
] dev gi1/
0
/
12
, [direct
00
:
49
:
34
]
O *
10.0
.
1.0
/
24
[
150
/
20
] via
10.0
.
0.1
on gi1/
0
/
12
, [ospf1
00
:
49
:
53
] (
0.0
.
0.3
)
O *
192.168
.
20.0
/
24
[
150
/
30
] via
10.0
.
0.1
on gi1/
0
/
12
, [ospf1
00
:
50
:
15
] (
0.0
.
0.3
)
C *
192.168
.
10.0
/
24
[
0
/
0
] dev lo1, [direct
21
:
32
:
01
]
Review the routing table on R3 router: