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Cisco ONS 15600 Reference Manual, R7.2
Chapter 9 Management Network Connectivity
9.7 TCP/IP and OSI Networking
Figure 9-19 shows a remote node connected to an ENE Ethernet port. Proxy and firewall tunnels are
useful in this example because the GNE would otherwise block IP access between the PC and foreign
node. This configuration also requires a firewall tunnel on the ENE.
Figure 9-19 Foreign Node Connection to an ENE Ethernet Port
9.7 TCP/IP and OSI Networking
ONS 15600 DCN communication is based on the TCP/IP protocol suite. However, ONS 15600s can also
be networked with equipment that uses the OSI protocol suite. While TCP/IP and OSI protocols are not
directly compatible, they do have the same objectives and occupy similar layers of the OSI reference
model. Table 9-8 shows the protocols and mediation processes that are involved when TCP/IP-based
NEs are networked with OSI-based NEs.
Remote CTC
10.10.20.10
10.10.20.0/24
10.10.10.0/24
Interface 0/0
10.10.20.1
Router A
Interface 0/1
10.10.10.1
ONS 15600
GNE
10.10.10.100/24
ONS 15600
ENE
10.10.10.250/24
ONS 15600
E NE
10.10.10.150/24
ONS 15600
ENE
10.10.10.200/24
115758
Local/Craft CTC
192.168.20.20
Ethernet
SONET
Non-ONS node
Foreign NE
130.94.122.199/28