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Technical Configuration Guide for SNMP v2.0 December 2006
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NORTEL External Distribution
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2. SNMP Upgrade Considerations
Please note the following when upgrading software on the ERS8600.
Starting in software release 3.7 and continued to software release 4.1.x, the CLI command save
config creates a hidden and encrypted file that contains the SNMP community table information.
For security purposes, the save config command also removes reference to the existing SNMP
community strings in the newly created configuration file. Please note that if you only have one
CPU, and if you swap the CPU, you must backup all hidden files or else all the password and
SNMP references will be lost. If you do not backup the hidden files, you must reconfigure your
trap receivers and community strings every time you change the CPU.
The commands to change the SNMP Community strings and trap receivers in software release
3.3 have changed in software releases 3.5, 3.7, 4.0, and 4.1.x. However, even though software
releases 3.5, 3.7, 4.0, and 4.1.x use the same commands, in software release 3.7 and 4.1.x only,
the SNMP community strings and trap receivers are stored in a hidden and encrypted file and are
not found in the configuration file. This is similar with software releases 3.5 and 4.0; however the
files are stored in a hidden non-encrypted file. Upgrades from 3.7 to 4.1.x, all files are translated
as-is. Please see section 3.3.3 for more details.
2.1 Hidden File Details
Backup the following configuration files to either via FTP, a TFTP server or a PCMCIA card:
• shadov.txt
• snmp_usm.txt
• snmp_comm.txt
• password.txt