CCNA Complete Guide 2nd Edition.pdf - Cisco Learning Home

- CDP is enabled by default.
The no cdp run global configuration command completely disables CDP on a device.
The no cdp enable interface subcommand disables CDP for an interface – stop sending out
and ignore CDP packets on the interface.
Telnet
Cat3550#sh cdp int fa0/1
FastEthernet0/1 is up, line protocol is up
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
Cat3550#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Cat3550(config)#cdp ?
advertise-v2 CDP sends version-2 advertisements
holdtime Specify the holdtime (in sec) to be sent in packets
run Enable CDP
timer Specify the rate at which CDP packets are sent (in sec)
Cat3550(config)#int fa0/1
Cat3550(config-if)#no cdp enable
Cat3550(config-if)#^Z
Cat3550#sh cdp int fa0/1
Cat3550#
- Cisco IOS allows Telnet from a Cisco device to another Cisco device. An important feature of
the telnet EXEC command is the suspend feature.
- Lab setup: Setup the sample network as in Figure 10-1. Configure the hostname and IP address
on every device, and create a host table consisting static entries for all devices on every device.
- Below lists some Cisco IOS Telnet-related commands:
telnet {hostname | ip-addr} Used to Telnet from a device to another device.
show sessions or where Used to list the suspended telnet sessions.
resume {connection-id} Used to resume a suspended telnet session.
disconnect {connection-id} Used to terminate a suspended telnet session.
- A Telnet session can be suspended with the following key sequence:
Ctrl + Shift + 6, release, then x.
- In the show sessions or where EXEC commands output, an asterisk [*] will be shown at the
left of the most recently suspended Telnet session, which can be resumed by using the resume
EXEC command, or by pressing Enter or Tab in EXEC or privileged mode. Connection ID is
the identification for a Telnet session.
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Copyright © 2008 Yap Chin Hoong
yapchinhoong@hotmail.com