Scenario 4: Default Gateway On Ctc Computer; Figure 19-4 Scenario 3: Using Proxy Arp With Static Routing (Ansi And Etsi) - Cisco ONS 15454 DWDM Installation And Operation Manual

19.2.4 Scenario 4: Default Gateway on CTC Computer

for additional hosts. Each node examines its routing table for routes to hosts that are not connected to
the DCC network but are within the subnet. The existing proxy server replies to ARP requests for these
additional hosts with the node MAC address. The existence of the host route in the routing table ensures
that the IP packets addressed to the additional hosts are routed properly. Other than establishing a static
route between a node and an additional host, no provisioning is necessary. The following restrictions
apply:
•
•
In Figure
announces that it can reach the ONS 152xx. The ONS 152xx is shown as an example; any network
element can be set up as an additional host.

Figure 19-4 Scenario 3: Using Proxy ARP with Static Routing (ANSI and ETSI)

CTC Workstation
IP Address 192.168.1.100
Subnet Mark at CTC Workstation 255.255.255.0
Default Gateway = N/A
ONS 15454 #2
IP Address 192.168.1.20
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = N/A
19.2.4 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
ARP is not used because the network includes different subnets. For the CTC computer to communicate
with Nodes 2 and 3, Node 1 is entered as the default gateway on the CTC computer.
Cisco ONS 15454 DWDM Installation and Operations Guide, R4.7
19-6
Only one node acts as the proxy ARP server for any given additional host.
A node cannot be the proxy ARP server for a host connected to its Ethernet port.
19-4, Node 1 announces to Node 2 and 3 that it can reach the CTC host. Similarly, Node 3
ONS 15454 #1
IP Address 192.168.1.10
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = Destination 192.168.1.100
Ring
(Figure
Mask 255.255.255.0
Next Hop 192.168.1.30
ONS 15454 #3
IP Address 192.168.1.30
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = Destination 192.168.1.31
19-5). Node 1 and the CTC computer are on subnet 192.168.1.0. Proxy
Chapter 19 CTC Connectivity Reference
LAN A
ONS 152xx
IP Address 192.168.1.31
Subnet Mask 255.255.255.0
Mask 255.255.255.255
Next Hop 192.168.1.30
September 2004