ITL Getting Information: Packet Sniffing Cisco Router Commands SNMP.

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Presentation transcript:

ITL Getting Information: Packet Sniffing Cisco Router Commands SNMP

(c) 2001, Hans Kruse and Shawn Ostermann 2 Router Command Access  Access is possible via Telnet (usually over Ethernet, Token Ring, etc) SNMP Serial Port

(c) 2001, Hans Kruse and Shawn Ostermann 3 Three Access Levels  Basic Access Display commands Password protected  Privileged Mode – second password Access to all information Reset and reboot commands  Configuration Command Mode

(c) 2001, Hans Kruse and Shawn Ostermann 4 Locating Interfaces  On simple routers Interface type and number Serial 0, or Ethernet 1  On modular routers Interface Type, slot, and port Ethernet 0/0 Serial 1/1

(c) 2001, Hans Kruse and Shawn Ostermann 5 Getting Help  Help command  “?” command  Type a partial command followed by “?” Example “show s?”

(c) 2001, Hans Kruse and Shawn Ostermann 6 Useful things to do  Get information Is an interface up or down? What are the parameters for the interface What are the statistics Packets/Octets received or sent Number of errors Queue length, current occupancy, packets dropped

(c) 2001, Hans Kruse and Shawn Ostermann 7 Looking ahead to next week  Router Configuration Set general parameters Configure each interface Give each interface an address and mask Set up routes Which interface should the router use for any given address

(c) 2001, Hans Kruse and Shawn Ostermann 8 Documentation/Help  Cisco documentation is on-line   Link to technical documentation Hardware descriptions IOS Command Reference