15-11
Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 15 Management Network Connectivity
15.2.6 Scenario 6: Using OSPF
eliminates the need to manually enter static routes for ONS 15454 subnetworks. Figure 15-8 shows a
network enabled for OSPF. Figure 15-9 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.
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 OSPF topology for advertising to an OSPF network, you must assign
an OSPF area ID in decimal format to the ONS 15454 network. An area ID is a “dotted quad” value that
appears similar to an IP address. Coordinate the area ID number assignment with your LAN
administrator. All DCC-connected ONS 15454s should be assigned the same OSPF area ID.
Note It is recommended that the number of ONS 15454s in an OSPF area be limited, because this allows faster
loading into a CTC an is less likely to incur any problems.
Figure 15-8 Scenario 6: OSPF Enabled (ANSI and ETSI)
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 #2
IP Address 192.168.3.20
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = N/A
ONS 15454 #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 #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"
Ring
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