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12-9
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter 12 CTC Network Connectivity
12.2.6 Scenario 6: Using OSPF
Figure 12-7 Scenario 5: Static Route With Multiple LAN Destinations
12.2.6 Scenario 6: Using OSPF
Open Shortest Path First (OSPF) is a link state Internet routing protocol. Link state protocols use a “hello
protocol” to monitor their links with adjacent routers and to test the status of their links to their
neighbors. Link state protocols advertise their directly connected networks and their active links. Each
link state router captures the link state “advertisements” and puts them together to create a topology of
the entire network or area. From this database, the router calculates a routing table by constructing a
shortest path tree. Routes are continuously recalculated to capture ongoing topology changes.
ONS 15454 SDH #2
IP Address 192.168.2.20
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = N/A
ONS 15454 SDH #1
IP Address 192.168.2.10
Subnet Mask 255.255.255.0
Default Router = 192.168.2.1
ONS 15454 SDH #3
IP Address 192.168.2.30
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = N/A
LAN B
SDH RING
Static Routes
Destination 0.0.0.0
Mask 0.0.0.0
Next Hop 192.168.2.1
Cost = 2
71303
CTC Workstation
IP Address 192.168.1.100
Subnet Mask 255.255.255.0
Default Gateway = 192.168.1.1
Host Routes = N/A
Router #1
IP Address of interface ”A” to LAN “A” 192.168.1.1
IP Address of interface “B” to LAN “B” 192.168.2.1
Subnet Mask 255.255.255.0
Destination = 192.168.0.0
Mask = 255.255.255.0
Next Hop = 192.168.2.10
LAN A
Int "A"
Int "B"
Router #2:
IP Address of the interface connected to LAN-A = 192.168.1.10
IP Address of the interface connected to LAN-C = 192.168.5.1
Subnet Mask = 255.255.255.0
Static Routes:
Destination = 192.168.0.0
Mask = 255.255.255.0
Next Hop = 192.168.1.1
Destination = 192.168.4.0
Mask = 255.255.255.0
Next Hop = 192.168.5.1
Destination = 192.168.4.0
Mask = 255.255.255.0
Next Hop = 192.168.5.1