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Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter 12 CTC Network Connectivity
12.2.6 Scenario 6: Using OSPF
ONS 15454 SDH nodes 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 SDH nodes 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 enter static routes for ONS 15454 SDH subnetworks
manually.
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. Every OSPF network has one backbone area called “area 0.” All other
OSPF areas must connect to area 0.
When you enable an ONS 15454 SDH OSPF topology for advertising to an OSPF network, you must
assign an OSPF area ID to the ONS 15454 SDH network. Coordinate the area ID number assignment
with your LAN administrator. All DCC-connected ONS 15454 SDH nodes should be assigned the same
OSPF area ID.
Figure 12-8 shows a network enabled for OSPF.
Figure 12-8 Scenario 6: OSPF Enabled
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
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
ONS 15454 SDH #2
IP Address 192.168.3.20
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
Static Routes = N/A
ONS 15454 SDH #3
IP Address 192.168.4.30
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = N/A
LAN B
LAN A
Int "A"
Int "B"
SDH RING
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