CCNP OSPF Virtual Links:
This will allow a R6 to get route info from the router over the next router beyond.
(R6–> next hop routerR2–>next router beyond R1)
Another word, we need to setup Virtual link that is not directly connecting to R6
but on the next hop router and path to area 0 when we want to R6 to receive
route info Area 0
R6:
=========
conf t
router ospf 1
router-id 6.6.6.6
network 172.17.2.0 0.0.0.3 area 3
exit
int g0/0
ip add 172.17.2.2 255.255.255.0
shut
no shut
exit
end
wr
Troubleshooting:
sh ip int br
turn ON debug:
debug ip ospf adj
turn off debug::
u all
sh ip ospf int
sh ip ospf neig
clear ip ospf redistribution
clear ip ospf proces
default int xx
sh run | b ospf
R2:::::
=====
conf t
router ospf 1
router-id 2.2.2.2
network 172.17.2.0 0.0.0.3 area 3
exit
int g0/0
ip add 172.17.2.1 255.255.255.0
shut
no shut
exit
=================================
—configure virtual-link:
R2::::::
=====
conf t
router ospf 1
area 2 virtual-link 1.1.1.1
—–
R1: configure virtual links:
conf t
router ospf 1
area 2 virtual-link 2.2.2.2
After you do this, go to R6 and do:
sh ip route
sh ip ospf neig
you will be able to see R3 and R4 route info.
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