Cisco ONS 15454 SDH Specifications Page 178

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4-10
Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
Chapter 4 IP Networking
Scenario 7: Using OSPF
Figure 4-8 Scenario 6: Static route for multiple CTCs
4.8 Scenario 7: 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 SDHs use the OSPF protocol in internal ONS 15454 SDH networks for node discovery,
circuit routing, and node management. You can enable OSPF on the ONS 15454 SDHs so that the ONS
15454 SDH topology is sent to OSPF routers on a LAN. Advertising the ONS 15454 SDH network
topology to LAN routers eliminates the need to manually enter static routes for ONS 15454 SDH
subnetworks. Figure 4-9 shows the same network enabled for OSPF. Figure 4-10 shows the same
network without OSPF. Static routes must be manually added to the router in order for CTC computers
on LAN A to communicate with ONS 15454 SDH #2 and #3 because these nodes reside on different
subnets.
OSPF divides networks into smaller regions, called areas. An area is a collection of networked end
systems, routers, and transmission facilities organized by traffic patterns. Each OSPF area has a unique
ID number, known as the area ID, that can range from 0 to 4,294,967,295. Every OSPF network has one
backbone area called area 0. All other OSPF areas must connect to area 0.
CTC Workstation #2
IP Address 192.168.1.200
Subnet Mask 255.255.255.0
Default Gateway = N/A
CTC Workstation #1
IP Address 192.168.1.100
Subnet Mask 255.255.255.0
Default Gateway = N/A
ONS 15454 SDH #2
IP Address 192.168.1.20
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes
Destination 192.168.1.200
Mask 255.255.255.255
Next Hop 192.168.1.20
Cost = 1
ONS 15454 SDH #1
IP Address 192.168.1.10
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes
Destination 192.168.1.100
Mask 255.255.255.255
Next Hop 192.168.1.10
Cost = 1
ONS 15454 SDH #3
IP Address 192.168.1.30
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = N/A
LAN A
LAN B
SDH RING
71301
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