Could anyone help me with the Cisco IOS command for finding the suported protocols (level 2: link layer) by one serial interface, Serial 0/0 in this case?
The router is a Cisco 2600 (1 ethernet port, 2 serial ports).
Thanks in advance.
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From an exec prompt,
Router#show protocols serial 0/0
would give you the protocols currently being used by the serial port numbered 0/0.
You can find out more in interface configuration mode:
Router#configure terminal Router(config)#interface serial 0/0 Router(config-if)#encapsulation ?
When you hit the ? after typing 'encapsulation', it kicks into ios help which will provide a list of things your router would accept as a layer 2 encapsulation / protocol. Mine are wic-2t cards and offer sdlc, ppp, hdlc among others.
As an aside, to find out what protocols your actual router is geared up to work with, you can do
to find out your ios image (mine is currently 'c1841-adventerprisek9-mz.151-2.T.bin') and put it into the feature navigator at http://tools.cisco.com/ITDIT/CFN/jsp/SearchBySoftware.jsp