What is the default Local Management Interface frame type transmitted by a Cisco router on a Frame Relay circuit?

The correct answer is D. Cisco. Cisco developed its own proprietary LMI (Local Management Interface) type for Frame Relay before industry standards were ratified. As a result, Cisco IOS defaults to the 'cisco' LMI type on Frame Relay interfaces. The other valid LMI types are 'ansi' (based on ANSI T1.617 Annex D

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Question

What is the default Local Management Interface frame type transmitted by a Cisco router on a Frame Relay circuit?

Options

AG933a
B882S
CIETF
DCisco
EANSI

How the community answered

(15 responses)

A
7% (1)
B
7% (1)
D
87% (13)

Explanation

Cisco developed its own proprietary LMI (Local Management Interface) type for Frame Relay before industry standards were ratified. As a result, Cisco IOS defaults to the 'cisco' LMI type on Frame Relay interfaces. The other valid LMI types are 'ansi' (based on ANSI T1.617 Annex D) and 'q933a' (based on ITU-T Q.933 Annex A). All three can be manually configured with the 'frame-relay lmi-type' command. In modern IOS versions, LMI autosensing (autosense) is also available, but the historical default remains the Cisco proprietary type. IETF refers to an encapsulation type, not an LMI type.

Topics

#Frame Relay#LMI#WAN#Cisco default

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