Frame-Relay End-to-end Keepalive

Frame-Relay end to end keepalives provides status to verify that end-to-end communications are working and that traffic is getting through.

The Frame-Relay End-to-End keepalive feature can be configured in 4 modes
- biirectional mode 
    -  both the send side and receive side are enable
- request mode
    - only the send side in enabled, and the device sends out and waits for replies to its keepalives requests
- reply mode
    - only the receive side is enabled, and the device waits for and replies to keepalive request.
- passive reply mode
    -  the device only responds to keepalive requests, but does not set any timers or keep track of any events

Example Configuration 


interface Serial1/0
 ip address 192.168.1.1
 encapsulation frame-relay
 shutdown
 serial restart-delay 0
 frame-relay interface-dlci 101
  class END2END_KEEPALIVE
!
map-class frame-relay END2END_KEEPALIVE
 frame-relay end-to-end keepalive mode request
!

Verification
show frame-relay end-to-end keepalive