You can modify some SNMP Attributes; however, some of these attributes are read-only and, therefore, cannot be modified.
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The following is an example to modify the CLLI.
snmpset -c private <host name> .1.3.6.1.4.1.1556.17.15.46.65.64.53.1.1.5.1.1.1.1.131841 s "Test changing CLLI" snmpget -c public <host name> .1.3.6.1.4.1.1556.17.15.46.65.64.53.1.1.5.1.1.1.1.131841