CHAPTER 9 Getting Started with SNMP
Mediant 800 SBC | SNMP Reference Guide
(config-system)# snmp trap
(snmp-trap)# community-string
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SNMPv3 Settings: When using SNMPv3 settings it is important to note that by default the
trap configuration remains such that the traps are sent out in SNMPv2c mode. To have
traps sent out in SNMPv3, you can use either ini file or SNMP:
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INI file: amongst the SNMPv3 users ensure that you also define a trap user (the value
of 2 in the SNMPUsers_Group indicates the trap user). For example: you can have the
SNMP users table defined with a read-write user, ‘rwmd5des’ with MD5 authentication
and DES privacy, along with a trap user, ‘tmd5no’ with SHA authentication and DES
privacy:
[ SNMPUsers ]
FORMAT SNMPUsers_Index = SNMPUsers_Username, SNMPUsers_
AuthProtocol, SNMPUsers_PrivProtocol, SNMPUsers_AuthKey,
SNMPUsers_PrivKey, SNMPUsers_Group;
SNMPUsers 1 = rwmd5des, 1, 1, myauthkey, myprivkey, 1;
SNMPUsers 2 = tshades, 2, 1, myauthkey, myprivkey, 2
[ \SNMPUsers ]
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If you define a trap user only, the device runs in SNMPv3 mode but will not be
accessible as there are no defined read-write or even read-only users.
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If you define non-default community strings (SNMPv2c), you need to access the
device via SNMPv2c.
Along with this configuration, you also need to associate the trap targets
(managers) with the user:
SNMPMANAGERTRAPUSER_x=tshades
where x is the target index and can be between 0 and 4.
Any targets that are defined in the ini file where this last parameter isn’t defined,
receives SNMPv2c traps.
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SNMP: change snmpTargetAddrParams object to the user of your choice adding the
letters ‘usm’ as prefix (ensure it’s a trap user). For example, the ‘tshades’ user should
be added as ‘usmtshades’.
Carrier Grade Alarm (CGA)
A carrier-grade alarm system provides a reliable alarm reporting mechanism that takes into
account element management system outages, network outages, and transport mechanism
such as SNMP over UDP.
A carrier-grade alarm system is characterized by the following:
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