Author Archive

Introducing the Topology:

The show controllers command reveals whether the cable is DCE or DTE.

#show controllers serial 0/0/0

Interface serial0/0/0
Hardware is powerQUICC MPC860
DCE v.35, no clock

Interfaces:
By default all Serial and Ethernet interfaces are down.
The routing table will be empty.

Debugging:

Allows us to watch changes a router performs in real time.
For example, to observe routes being added and removed.

#debug ip routing
#undebug all (disables all debug commands). or
#no debug all. or
#un a. (short form)

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Tags: 802.1q, study, vlan, switch, vtp, wan

Configuring a Web Interface:

Switches have web-based config tools that require an onboard HTTP server:
Web browser GUI.
Security Device Manager (SDM).
IP Phone and Telephony apps.
HTTP services ? security hole ? optional authentication.
If many users access HTTP services you may require a separate authentication server.
AAA and TACACS can be used to validate user credentials, (robust).
A less complex method allows use of the enable password.
A local authentication method requires the user to use a login username and password specified in the config.

S1(config)#ip http server ? turns on the server (on by default).
S1(config)#ip http authentication enable.

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Tags: wan, switch, cisco, router, vtp, study