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Monitoring

Implementing Syslog

  • Your switch can store syslog messages locally
  • Syslog uses UDP port 514
lin con 0
logging synchronous
logging 172.30.100.30
logging trap debugging

Understanding SNMP

  • SNMP "simply" grabs statistics from devices
  • Monitoring applications manipulate and message data
  • Three SNMP versions
snmp-server community $up3r$ecr3t ro
access-list 10 permit 172.30.100.30 0.0.0.0
snmp-server community $up3r$ecr3t ro 10
do sh run | i snmp

Understanding IP SLA

  • A way of detecting link failure using real time data
  • A way of testing service levels on a line
  • A way to add valuable data to network monitoring
  • A way to impress your friends
  • SLA endpoint can be either a device or ip sla responder
ip sla 100
icmp-ech 4.2.2.2
frequency 5
ip sla schedule 100 start-time now life forever
track 1 rtr 100 reachability
sh ip sla statistics
ip route 0.0.0.0 0.0.0.0 216.22.345.122 track 100