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4-6
Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter 4 IP Networking
ONS 15454 IP Addressing Scenarios
4.2.4 Scenario 4: Default Gateway on CTC Computer
Scenario 4 is similar to Scenario 3, but nodes #2 and #3 reside on different subnets, 192.168.2.0 and
192.168.3.0, respectively (Figure 4-4). Node #1 and the CTC computer are on subnet 192.168.1.0. The
network includes different subnets because Proxy ARP is not used. In order for the CTC computer to
communicate with ONS 15454s #2 and #3, ONS 15454 #1 is entered as the default gateway on the CTC
computer using the “Direct Connections to the ONS 15454” section on page 2-5.
Figure 4-4 Scenario 4: Default gateway on a CTC computer
4.2.5 Scenario 5: Using Static Routes to Connect to LANs
Static routes are used for two purposes:
• To connect ONS 15454s to CTC sessions on one subnet connected by a router to ONS 15454s
residing on another subnet. (These static routes are not needed if OSPF is enabled. Scenario 7 shows
an OSPF example.)
• To enable multiple CTC sessions among ONS 15454s residing on the same subnet. (Scenario 6
shows an example.)
In Figure 4-5, one CTC residing on subnet 192.168.1.0 connects to a router through interface A. (The
router is not set up with OSPF.) ONS 15454s residing on subnet 192.168.2.0 are connected through ONS
15454 #1 to the router through interface B. Proxy ARP enables ONS 15454 #1 as a gateway for ONS
15454s #2 and #3. To connect to CTC computers on LAN A, a static route is created on ONS 15454 #1.
CTC Workstation
IP Address 192.168.1.100
Subnet Mask at CTC Workstation 255.255.255.0
Default Gateway = 192.168.1.10
Host Routes = N/A
ONS 15454 #2
IP Address 192.168.2.20
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = N/A
ONS 15454 #1
IP Address 192.168.1.10
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = N/A
ONS 15454 #3
IP Address 192.168.3.30
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = N/A
LAN A
SONET RING
33160