List of Figures
Figure 1. Example output from the SHOW CONFIG command. ........................................................................................ 14
Figure 2. Example output from the SHOW LOADER command. ....................................................................................... 15
Figure 3. Example output from the SHOW SYSTEM command. ....................................................................................... 16
Figure 4. IP packet or datagram......................................................................................................................................... 20
Figure 5. Subdivision of the 32 bits of an Internet address into network and host fields for class A, B and C networks ... 22
Figure 6. IGMP snooping network layers ........................................................................................................................... 26
Figure 7. Example output from the SHOW IP command.................................................................................................... 35
Figure 8. Example output from the SHOW IP INTERFACE command. ............................................................................. 36
Figure 9. Example output from the SHOW NTP command................................................................................................ 38
Figure 10. Example output from SHOW DNS command. .................................................................................................. 42
Figure 11. Example output from the SHOW IP command.................................................................................................. 42
Figure 12. Phone --> AT-RG213 (A) --> AT-RG213 (B) --> Phone.................................................................................... 48
Figure 13. Phone --> AT-RG213 (A)--> LAN SIP endpoint ................................................................................................ 49
Figure 14. LAN SIP endpoint --> AT-RG213 --> Phone ..................................................................................................... 50
Figure 15. Example output from the SHOW SIP PORT command. ................................................................................... 55
Figure 16. Example output from the SHOW SNMP command........................................................................................... 60
Figure 17. L2TP network model ......................................................................................................................................... 63
Figure 18. Example output from the SHOW L2TP command ............................................................................................ 66
Figure 19. RING tone diagram ........................................................................................................................................... 69
Figure 20. Tones Frequency/Time graphs ......................................................................................................................... 71
Figure 21. RTP Packet receive path .................................................................................................................................. 73
Figure 22. Example output from the SHOW PHONE command. ....................................................................................... 77
Figure 23. The VLAN field in the Ethernet file .................................................................................................................... 82
Figure 24. Switch architecture............................................................................................................................................ 82
Figure 25. Example output from the SHOW SWITCH command....................................................................................... 94
Figure 26. Example output from SHOW SWITCH FDB command..................................................................................... 95
Figure 27. Example output from SHOW SWITCH PORT command.................................................................................. 96
Figure 28. Example output from the SHOW SWITCH PORT COUNTER command. ........................................................ 98
Figure 29. Example output from the SHOW SWITCH QOS command............................................................................ 100
Figure 30. Example output from the SHOW VLAN command.......................................................................................... 101