Multicast and Routing Guide K/KA/KB.15.15

Items of particular interest are:
• The ip routing command enables routing on the switch.
• The router ospf command enables OSPF routing on the switch. The area backbone
command establishes the backbone area (area 0.)
• The router rip command enables RIP routing on the switch. The redistribute
connected command redistributes directly connected routes to all routers in the attached RIP
domain.
• The vlan commands at the end of the configuration assign routing protocols to the VLANs.
Additionally, they make area assignments for VLANs in the OSPF domain.
The other routers have analogous, if somewhat simpler, routing configurations. The Northwest,
Northeast, and Southeast routers have only RIP enabled, and the East router has only OSPF enabled.
The North router enables both routing protocols, but has fewer VLANs.
Listed below are the routing tables that result for three representative routers:
South A border router attached to both RIP and OSPF domains.
East A router within the OSPF domain.
Southeast A router within the RIP domain.
South(config)# show ip route
IP Route Entries
Destination Gateway VLAN Type Sub-Type Metric Dist.
--------------- --------------- ---- --------- ---------- ---------- -----
10.2.21.0/24 VLAN21 21 connected 1 0
10.2.22.0/24 10.2.21.2 21 rip 2 120
10.2.23.0/24 10.2.21.2 21 rip 2 120
10.2.29.0/24 VLAN29 29 connected 1 0
10.3.31.0/24 VLAN31 31 connected 1 0
10.3.32.0/24 10.3.31.1 31 ospf IntraArea 2 110
10.3.32.0/24 10.3.33.1 33 ospf IntraArea 2 110
10.3.33.0/24 VLAN33 33 connected 1 0
10.3.34.0/24 10.3.33.1 33 ospf IntraArea 2 110
10.3.37.0/24 VLAN37 37 connected 1 0
127.0.0.0/8 reject static 0 0
127.0.0.1/32 lo0 connected 1 0
East(config)# show ip route
IP Route Entries
Destination Gateway VLAN Type Sub-Type Metric Dist.
--------------- --------------- ---- --------- ---------- ---------- -----
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
Southeast(config)# show ip route
IP Route Entries
Destination Gateway VLAN Type Sub-Type Metric Dist.
--------------- --------------- ---- --------- ---------- ---------- -----
10.2.21.0/24 VLAN21 21 connected 1 0
10.2.22.0/24 VLAN22 22 connected 1 0
216 Route Policy