【正文】 way to gather CDP information about remote devices ? VTY passwords must be set or no login (not preferred) ? Use tel ip address or simple ip address from any router prompt to open a tel session 來自 中國最大的資料庫下載 Telting into Multiple Devices Simultaneously ? Use Ctrl+Shift+6 then X to switch between the tel session and the original router console ? Example: 2509 2501B You are here! You have telted here from 2509! 1900 You have telted here from 2509! ip address ip address ip address 2509 tel Trying … Open User Access Verification Password: 2501B ctrl + Shift + 6 then x 2509 來自 中國最大的資料庫下載 Checking Tel Connections ? sh sessions – to show the connections made from your router to remote device ? Example: (two tel sessions opened) The asterisk (*) indicate the last session. You can enter the last session by pressing Enter twice or switch to any session by typing the number of the connection and pressing Enter twice. 2509 2501B You are here! You have telted here from 2509! 1900 You have telted here from 2509! ip address ip address ip address 2509 sh sessions Conn Host Address Byte Idle Conn Name 1 0 0 * 2 0 0 2509 來自 中國最大的資料庫下載 Checking Tel Users ? sh users – to list all active consoles and VTY ports in use on your router ? Example 1: (one console to two tel sessions) ? Example 2: (one console and one tel session with port 2 is being used) The asterisk (*) indicate the current terminal session user. 2509 2501B You are here! You have telted here from 2509! 1900 You have telted here from 2509! ip address ip address ip address 2509 sh users Line User Host (s) Idle Location * 0 con 0 00:07:52 00:07:18 2501B sh users Line User Host (s) Idle Location 0 con 0 idle 9 * 2 vty 0 來自 中國最大的資料庫下載 Closing Tel Sessions ? exit – to end a session from a remote device which is being telted ? disconnect – to end a connection to a remote router from the originating router ? clear line – to end a connection connected via Tel by other to your router ? Example: If you are at the 2509 console and 2509 has telentted to 2501B, you can end the connection by using: disconnect no. from 2509 prompt exit from 2501B prompt If you are at the 2501B console, you can also end the connection by using clear line no. from 2501B prompt 2509 2501B You are here! You have telted here from 2509! 1900 You have telted here from 2509! ip address ip address ip address 來自 中國最大的資料庫下載 Resolving Hostnames Building a Host Table Using DNS to Resolve Names 來自 中國最大的資料庫下載 Building a Host Table ? Provide name resolution only on the router on which it was built (same as the host file in Windows/Unix) ? Use ip host name tcp_port_no. ip_address from the global configuration mode to build a host table on a router ? Since we use tel to connect to a remote device, the above tcp_port_no. can be skipped and the default port no. 23 will be used. You can create a session using Tel with a different tcp_port_no. , if needed, and you can assign up to 8 IP addresses to a hostname. ? Use sh hosts to see the content of the host table ? Use no ip host hostname to remove a hostname entry from the table 來自 中國最大的資料庫下載 Using DNS to Resolve Names ? Anytime a Cisco device receives a mand it doesn’t understand, it tries to resolve this through DNS by default. ? Use no ip domainlookup to disable the DNS lookup from the global configuration mode ? To enable DNS look