SNMP & NTP

SNMP – Simple network management protocol

• Manager – Monitoring device
• Agent – Devices being monitored
• MIB – management information Base
• UDP port 161
• Uses GETs and SETs
• SNMP Traps
  • Agent informs the manager.
• SNMPv1 and 2c have community strings.
• SNMPv3 has encryption and authentication.
  • auth – Group using the AuthNoPriv Security Level
    • Authentication: yes
    • Privacy ( encryption ): no
  • noauth – Group using the noAuthNoPriv Security Level
    • Authentication: no
    • Privacy ( encryption ): no
  • Priv – Group using the AuthPriv Security Level
    • Authentication: yes
    • Privacy ( encryption ): yes
• If no read view is defined , all objects can be read.
• If no write view is defined , no objects can be written.
• If no notify view is defined , group members are not sent notifications.

NTP – Network Time Protocol

• UDP port 123
• Correct time is needed for various, syslogging, certifcates, leases.
• Stratum-0 device on top the hirarchy.
• Stratum-1 device means it’s 1 hop away from the stratum-0 server.
• Master – Client mode
• Broadcast mode
  • on the interface

Master:

R1#(config)ntp master 4

AUTH:

R1#(config)ntp authentication-key 1 md5 CCNP
R1#(config)ntp trusted-key 1

Client:

R2#(config)ntp server 10.10.10.1 prefer

AUTH:

R2#(config)ntp authentication-key 1 md5 CCNP
R2#(config)ntp trusted-key 1
R2#(config)ntp server 10.10.10.1 key 1