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Tuesday, April 27, 2010

Question 53

What do you need to be aware of when using Frame-relay back to back?

1 comments:

Packets Analyzed said...

When using back-to-back frame-relay you must ensure that you turn off keepalives to ensure LMI is not used, if LMI is used the interface will never become up/up, also the DLCI on both ends should match.

Example:

R1
__

interface serial 1/0
no ip address
encapsulation frame-relay
no keepalive (disables LMI processing)
clock rate 128000 (DCE side must provide clocking)
interface serial 1/0.12 point-to-point
ip address 10.0.0.1 255.255.255.0
frame-relay interface-dlci 100

R2
__

interface serial 1/0
no ip address
encapsulation frame-relay
no keepalive (disables LMI processing)
interface serial 1/0.12 point-to-point
ip address 10.0.0.2 255.255.255.0
frame-relay interface-dlci 100

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