15-5
Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 15 Management Network Connectivity
15.2.3 Scenario 3: Using Proxy ARP to Enable an ONS 15454 Gateway
device. The LAN device then sends the datagram for the remote ONS 15454 to the MAC address of the
proxy ONS 15454. The proxy ONS 15454 uses its routing table to forward the datagram to the non-LAN
ONS 15454.
Scenario 3 is similar to Scenario 1, but only one ONS 15454 (Node 1) connects to the LAN
(Figure 15-3). Two ONS 15454s (Node 2 and Node 3) connect to ONS 15454 Node 1 through the section
DCC. Because all three ONS 15454s are on the same subnet, proxy ARP enables ONS 15454 Node 1 to
serve as a gateway for ONS 15345 Node 2 and Node 3.
Note This scenario assumes all CTC connections are to Node 1. If you connect a laptop to either ONS 15454
Node 2 or Node 3, network partitioning occurs; neither the laptop or the CTC computer can see all nodes.
If you want laptops to connect directly to end network elements (ENEs), you must create static routes
(see the “15.2.5 Scenario 5: Using Static Routes to Connect to LANs” section on page 15-8) or enable
the ONS 15454 proxy server (see “15.2.7 Scenario 7: Provisioning the ONS 15454 Proxy Server”
section on page 15-12).
Be aware that:
• GNE and ENE 15454 proxy ARP is disabled.
• There is exactly one proxy ARP server on any given Ethernet segment; however, there might be more
than one server in an ANSI or ETSI topology.
• The proxy ARP server does not perform the proxy ARP function for any node or host that is on the
same Ethernet segment.
• It is important in Figure 15-3 that the CTC workstation be located within the same subnet and on
the same Ethernet segment as the proxy ARP server.
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