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Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2
78-19417-01
Chapter 8 Management Network Connectivity
IP Addressing Scenarios
Scenario 3 is similar to Scenario 1, but only one ONS 15310-MA SDH node (#1) connects to the LAN
(Figure 8-3). Two ONS 15310-MA SDH nodes (#2 and #3) connect to Node 1 through the SDH DCC.
Because all three nodes are on the same subnet, Proxy ARP enables Node 1 to serve as a gateway for
Nodes 2 and 3.
Note This scenario assumes all CTC connections are to Node 1. If you connect a laptop to either Node 2 or
Node 3, network partitioning occurs, and neither the laptop or the CTC computer is able to see all nodes.
If you want laptops to connect directly to end network elements, you need to create static routes (see
Scenario 5) or enable the ONS 15310-MA SDH proxy server (see Scenario 7).
Figure 8-3 Scenario 3: Using Proxy ARP
You can also use proxy ARP to communicate with hosts attached to the craft Ethernet ports of
DCC-connected nodes (Figure 8-4). The node with an attached host must have a static route to the host.
Static routes are propagated to all DCC peers using OSPF. The existing proxy ARP node is the gateway
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:
• 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.
In Figure 8-4, Node 1 announces to Node 2 and 3 that it can reach the CTC host. Similarly, Node 3
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.
CTC Workstation
IP Address 192.168.1.100
Subnet Mask 255.255.255.0
Default Gateway = N/A
ONS 15310 #2
IP Address 192.168.1.20
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = N/A
ONS 15310 #1
IP Address 192.168.1.10
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = N/A
ONS 15310 #3
IP Address 192.168.1.30
Subnet Mask 255.255.255.0
Default Router = N/A
Static Routes = N/A
LAN A
SDH RING
271791