Module 4 – Learning about other Devices Testing network connections

Tools CDP - Ping – Packet Internet Groper Traceroute (Trace, Tracert) – Telnet

CDP Used to obtain information about neighboring Cisco devices (saat kita memeriksa tetangga device cisco di sekita dimana kita melakukan perintha berkaitan dgn CDP) Uses a Layer 2 *proprietary* protocol CDP Version 2 (CDPv2) latest version – needs IOS 12.0(3)T or later CDP Version 1 used from IOS 10.3 to 12.0(3)T

CDP Protocol independent Layer 2 protocol therefore Layer-3 independent media independent

Show cdp neighbors CDP discovers all Cisco devices that are directly connected to a local device Show CDP Neighbors Command displays a summary of info about the neighbors

Show cdp neighbors CDP v1 and CDPv2 displays Device ID Local Interface Holdtime Capability Platform Port ID CDPv2 (only) also displays VTP management domain name Native VLAN Full or half-duplex

Show cdp entry Show details for a specific CDP neighbors entry

Show cdp interface Show CDP setup parameters for the specified interface

The show cdp traffic Command(menampilkan statis cdp)

CDP commands

Starting and Stopping CDP Global cdp enable/disable Router(config)# cdp run Router(config)# no cdp run Jadi saat setelah cdp run, terus kita selesai setting apa2nya gitu, lanjut ke no cdp run supaya ga terjadi traffic Interface level cdp enable/disable interface FastEthernet 0/0 Router(config-interface)# cdp run Router(config-interface)# no cdp run

Telnet Application-level tool Mainly used to establish remote connections to network devices Telnet berada layer teratas karna kita sedang melakukan jaringan Ping berada di layer 3 (network). Ping itu point-to-point (satu per satu). Ping adalah perintah yang ada router

Telnet Operation Available in User or Privileged EXEC mode Default inactivity time – 10 minutes Can remotely connect to the Paris router from the Denver router if both routers have been previously configured Denver> telnet Paris (or connect Paris) or Denver> telnet 131.108.100.152 (ip tujuan) Paris> …. Paris> exit Denver>

Telnet

Advanced Telnet Operation Multiple Telnet sessions can be used and suspended with the Ctrl+Shift+6 then x sequence.

Ping Packet Internet Groper (PING) Operates at Layer 3 Uses ICMP echo request and echo response Tests end-to-end connectivity

. time out PING Uses ICMP messages Sends an ICMP echo request and waits for an ICPM echo reply Cisco codes: ! receipt of an echo reply message . time out U ICMP unreachable message received (no route) C Source Quench ICMP unreachable message received

Traceroute (trace)

Traceroute Operates at Layer 3 Sets TTL in IP packet header to expire at subsequent routers from the closest router to the furtherest router Tests each step along the route to destination Cisco codes: nn msec RTT for number of probes * probe timed out A administratively prohibited Q source quench H ICMP unreachable message received

Troubleshooting Ping Traceroute Telnet show interfaces show ip route debug