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Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2
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Chapter 8 Management Network Connectivity
IP Addressing Scenarios
The ONS 15310-MA SDH uses OSPF protocol in internal ONS 15310-MA SDH networks for node
discovery, circuit routing, and node management. You can enable OSPF on the ONS 15310-MA SDH so
that the ONS 15310-MA SDH topology is sent to OSPF routers on a LAN. Advertising the ONS
15310-MA SDH network topology to LAN routers eliminates the need to enter static routes for ONS
15310-MA 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 15310-MA SDH OSPF topology for advertising to an OSPF network, you
must assign an OSPF area ID in decimal format to the network. Coordinate the area ID number
assignment with your LAN administrator. All DCC-connected ONS 15310-MA SDH nodes should be
assigned the same OSPF area ID.
Figure 8-8 shows a network enabled for OSPF.
Figure 8-8 Scenario 6: OSPF Enabled
Figure 8-9 shows the same network without OSPF. Static routes must be manually added to the router
for CTC computers on LAN A to communicate with Nodes 2 and 3 because these nodes reside on
different subnets.
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 ìAî to LAN A 192.168.1.1
IP Address of interface ìBî to LAN B 192.168.2.1
Subnet Mask 255.255.255.0
ONS 15310 #2
IP Address 192.168.3.20
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = N/A
ONS 15310 #1
IP Address 192.168.2.10
Subnet Mask 255.255.255.0
Default Router = 192.168.2.1
Static Routes = N/A
ONS 15310 #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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