Simple Network Management Protocol (SNMP)
Versions commonly used;
- SNMPv1 – RFC 1157
- SNMPv2c (an extension to SNMPv2 to allow for communities) – RFC 1901, RFC 1905, and RFC 1906
- SNMPv3 (provides mechnism to encrypt and authenticate) – RFCs 3413 to 3415
SNMP Framework is made up of
- SNMP manager
- SNMP agent
- Management Information Base (MIB)
Two ways to collect data;
- Trapping – Managed device reports events to NMS (UDP 162)
- Polling – NMS interigates managed device to report on a variable (UDP 161)
Useful SNMP commands
- snmp-server communiity [ro|rw] [ACL]
- snmp-server system-shutdown
- show snmp
- show snmp community
- show snmp mib ifmib ifindex
RFC 1213 and definitions of SNMP traps described in RFC 1215
All snmp-server commands use v2c by default
ILMI is a hidden SNMP community string and used by ATM.
Table 1 SNMP Security Models and Levels
|()v1||()noAuthNoPriv||()Community String||()No||()Uses a community string match for authentication.|
|()v2c||()noAuthNoPriv||()Community String||()No||()Uses a community string match for authentication.|
|()v3||()noAuthNoPriv||()Username||()No||()Uses a username match for authentication.|
|()v3||()authNoPriv||()Message Digest 5 (MD5) or Secure Hash Algorithm (SHA)||()No||()Provides authentication based on the HMAC-MD5 or HMAC-SHA algorithms.|
|()v3||()authPriv||()MD5 or SHA||()Data Encryption Standard (DES)||()Provides authentication based on the HMAC-MD5 or HMAC-SHA algorithms. Provides DES 56-bit encryption in addition to authentication based on the CBC-DES (DES-56) standard.|
Support>configure>products>Cisco IOS 12.4T>Configuration Guides>Network Management>Cisco IOS Network Management Configuration Guide[http://www.cisco.com/en/US/customer/docs/ios/netmgmt/configuration/guide/12_4/nm_12_4_book.html](http://www.cisco.com/en/US/customer/docs/ios/netmgmt/configuration/guide/12_4/nm_12_4_book.html)
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