Perle Systems PERLE P850 - Manual (Page 101)

Servicing Information
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the bridge/router does not start in ZMODEM receive mode,
refer to Appendix D: Servicing Information.
The TFTP Load Flash operation may be aborted by re-
connecting to the console of the router and choosing the
Abort Load option from the Load FLASH Set-Up menu. This
will cause the router to reset and return to normal operations
operating from the existing software.
In the following diagram of a cluster of routers, when upgrading
the three P850 routers in the diagram, the upgrade order should
be Router C, then Router B, and finally Router A.
A TFTP software load to Router C would be performed as
follows:
- Using TFTP, get config.txt from each router and save.
- Telnet to Router C. Enter the ID or alias of Router B in
the Network (TFTP) option to put Router C in Network
Load mode. When Router C restarts in Network Load
mode, the connection to “Router B” will be re-
established only if autocall is enabled on router B.
The TFTP transfer of the upgrade code may now be
performed from the PC to Router C. Once
Router C has completed programming the flash and has
restarted in operational mode, the connection to Router B
will be re-established only if autocall is enabled on router B.
Once router C is operating with the new software, the PC may
be used to reload the config.txt file back to Router C.
Repeat for Router B, then again for Router A. Perform the
Router B upgrade using the ID or alias of Router A. Router A
upgrades would not require a remote site ID as the PC used
for TFTP transfers is located on the same LAN as Router A.