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Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter4 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.
Figure4-4 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 t o a rout er thr oug h in ter face 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 1545 4 #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