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Cisco ONS 15600 Reference Manual, R7.2
Chapter 9 Management Network Connectivity
9.7.9 OSI/IP Networking Scenarios
OSS-initiated software downloads consist of two parts: the OSS to destination NE TL1 download
request and the file transfer. The TL1 request is handled the same as described earlier. The ONS 15600
NEs use FTP for file transfers. OSI-only NEs use FTAM to perform file transfers. The FTAM protocol
is carried over OSI between the OSI NE and the ONS 15600 GNE. The GNE mediation translates
between FTAM to FTP.
9.7.9.3 OSI/IP Scenario 3: IP OSS, IP DCN, Other Vendor GNE, OSI DCC, and ONS ENE
In OSI/IP Scenario 3 (Figure 9-31), all TL1 traffic between the OSS and GNE is exchanged over the IP
DCN. TL1 traffic targeted for the GNE is processed locally. All other TL1 traffic is forwarded to the OSI
stack, which performs IP-to-OSI TL1 translation. The TL1 is encapsulated in the full OSI stack and sent
to the target NE over the DCC. The GNE can route to any node within the IS-IS domain because all NEs,
ONS 15600 and non-ONS 15600, have NSAP addresses and support IS-IS routing.
TL1 traffic received by an ONS 15600 NE and not addressed to its NSAP address is forwarded by IS-IS
routing to the correct destination. TL1 traffic received by an ONS 15600 NE and addressed to its NSAP
is sent up the OSI stack to the mediation function, which extracts the TL1 and passes it to the ONS 15600
TL1 processor.
An OSS initiated software download includes the OSS to destination node TL1 download request and
the file transfer. The TL1 request is handled as described earlier. The target node uses FTAM for file
transfers because the GNE does not support IP on the DCC and cannot forward FTP. The ONS 15600
NEs therefore must support an FTAM client and initiate file transfer using FTAM when subtended to an
OSI GNE.
In this scenario, the GNE has both IP and OSI DCN connections. The GNE only supports TL1 and FTP
over IP. Both are translated and then carried over OSI to the destination ENE (ONS 15600 or OSI-only
NE). All other IP traffic is discarded by the GNE. The CTC/CTM IP traffic is carried over an
IP-over-OSI tunnel to an ONS 15600 NE. The tunnel is created between an external router and an
ONS 15600 NE. The traffic is sent to the ONS 15600 terminating the tunnel. That ONS 15600 then
forwards the traffic over the tunnel to CTC/CTM by way of the external router.