This causes extensive redistribution of routes within all three routing domains, adding a large number of routes to
the route tables of all the routers. For example, the route table in the East router adds routes to subnets in both
RIP domains, and looks like this:
East(config)# show ip route
IP Route Entries
Destination Gateway VLAN Type Sub-Type Metric Dist.
--------------- --------------- ---- --------- ---------- ---------- -----
10.1.11.0/24 10.3.32.1 32 ospf External2 10 110
10.1.12.0/24 10.3.32.1 32 ospf External2 10 110
10.1.13.0/24 10.3.32.1 32 ospf External2 10 110
10.1.14.0/24 10.3.32.1 32 ospf External2 10 110
10.2.22.0/24 10.3.33.2 33 ospf External2 10 110
10.2.23.0/24 10.3.33.2 33 ospf External2 10 110
10.3.31.0/24 10.3.32.1 32 ospf IntraArea 2 110
10.3.31.0/24 10.3.33.2 33 ospf IntraArea 2 110
10.3.32.0/24 VLAN32 32 connected 1 0
10.3.33.0/24 VLAN33 33 connected 1 0
10.3.34.0/24 VLAN34 34 connected 1 0
10.3.37.0/24 10.3.33.2 33 ospf IntraArea 2 110
127.0.0.0/8 reject static 0 0
127.0.0.1/32 lo0 connected 1 0
But this route table does not include all the possible routes in all domains: routes to subnets 10.1.15.x, 10.1.16.x,
10.2.21.x, and 10.2.29.x (VLANs 15, 16, 21, and 29) are missing. Host computer M cannot ping host X because
there is no route to it, though it can ping through the "invisible" South router to host Y or host Z.
The problem is that those missing subnets are directly connected to the North and South border routers, and
directly connected routes must be explicitly redistributed with a
redistribute connected
command even
though they are RIP routes and RIP routes were redistributed. So by adding
redistribute connected
commands to the
router ospf
contexts of the North and South routers, like this:
.
.
router ospf
area backbone
redistribute connected
redistribute rip
exit
.
.
All existing routes are redistributed and the route table for the East router is now complete:
East(config)# show ip route
IP Route Entries
Destination Gateway VLAN Type Sub-Type Metric Dist.
--------------- --------------- ---- --------- ---------- ---------- -----
10.1.11.0/24 10.3.32.1 32 ospf External2 10 110
10.1.12.0/24 10.3.32.1 32 ospf External2 10 110
10.1.13.0/24 10.3.32.1 32 ospf External2 10 110
10.1.14.0/24 10.3.32.1 32 ospf External2 10 110
10.1.15.0/24 10.3.32.1 32 ospf External2 10 110
10.1.16.0/24 10.3.32.1 32 ospf External2 10 110
10.2.21.0/24 10.3.33.2 33 ospf External2 10 110
10.2.22.0/24 10.3.33.2 33 ospf External2 10 110
Chapter 12 Route Policy
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