NMS LAB2 EXPENSES  Software  Hardware and OS for software  Training  Extra usage of work time (active use of SNMP - software etc.)  New SNMP enabled Devices ?? if needed All most all recent manageable switches / routers support SNMP v1-2c, Some support SNMP V3

LAB2 SOFTWARE  Many users, either web based or a client  MUST for a big network (help desk can have read only access to software) Reduce of costs  Better availability for network  Usually your network is not used 24h/day If you have online shop / order system with international users (Different time zone) then you might need 24h uptime

LAB2 AVAILIBILITY  SNMP -monitoring only affects to the time to detect faults  ONLY If you have redundant fans / power supplies / network devices then monitoring can prevent downtime

LAB3 Same network setup as lab2  SNMP trap supports needs an additional command Snmp-server host uuu.xxx.yyy.zzz traps public Snmp-server enable traps snmp  SNMPc -program Remember to check SNMP communities Both read & Write (choose router-> right click -> properties)  Additional network analyzer software (Ethereal)  Check ethereal settings (Next slides)  Use display Filter

Ethereal Basic settings edit -> Preferences Check correct network interface Check Update packets in realtime Check Automatic scrolling

ETHEREAL Display Filters SNMP word in filter shows only SNMP messages Capture -> options Check settings  Update list realtime  Automatic scrolling

ethereal Frame Details / Layers 1-7 Captured frames Start new capture Stop new capture

Frame details from IP –protocol level

SNMP V3 In Cisco Devices Not needed for lab Auth  snmp-server group remotegroup v3 auth  snmp-server user remoteAuthUser remoteAuthGroup remote v3 auth md5  password1 Priv & Auth  snmp-server group remotegroup v3 priv  snmp-server user remote PrivUser remotePrivGroup remote v3 auth md5  password1 priv des56 password2