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Cisco ONS 15454 Reference Manual, R7.0
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Chapter 13 Management Network Connectivity
13.7 13.7.9 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 in the previous paragraph. The
ONS 15454 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 15454 GNE. The GNE mediation
translates between FTAM to FTP.
13.7.9.3 OSI/IP Scenario 3: IP OSS, IP DCN, Other Vendor GNE, OSI DCC, and ONS ENE
In OSI/IP Scenario 3 (Figure 13-33), 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 15454 and non-ONS 15454, have NSAP addresses and support IS-IS routing.
TL1 traffic received by an ONS 15454 NE and not addressed to its NSAP address is forwarded by IS-IS
routing to the correct destination. TL1 traffic received by an ONS 15454 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 15454
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 in the previous paragraph. The target node uses
FTAM for file transfers because the GNE does not support IP on the DCC and cannot forward FTP. The
ONS 15454 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 15454 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 15454 NE. The tunnel is created between an external router and an ONS 15454 NE.
The traffic is sent to the ONS 15454 terminating the tunnel. That ONS 15454 then forwards the traffic
over the tunnel to CTC/CTM by way of the external router.