LMI (Local Management interface) salah satu fungsinya adalah sebagai keepalive, namun terbatas hanya pada lokal link antara router dan FR switch. agar bisa mengetahui status remote end / ujung jauh kita bisa menggunakan Frame Relay end-to-end keepalive (FREEK). dengan begitu status dari DTE ujung bisa diketahui statusnya. apabila remote end down maka Router dapat dengan cepat mengambil keputusan untuk menggunakan link cadangan / backup (failover).
R2(config)#frame-relay switching
R2(config)#interface s1/0
R2(config-if)#encapsulation frame-relay
R2(config-if)#frame-relay intf-type dce
R2(config-if)#frame-relay lmi-type cisco
R2(config-if)#frame-relay route 102 interface s1/1 201
R2(config-if)#no shut
R2(config-if)#interface s1/1
R2(config-if)#encapsulation frame-relay
R2(config-if)#frame-relay intf-type dce
R2(config-if)#frame-relay lmi-type cisco
R2(config-if)#frame-relay route 201 interface s1/0 102
R2(config-if)#no shut
R1(config)#interface s1/0
R1(config-if)#encapsulation frame-relay
R1(config-if)#no shut
R1(config-if)#interface s1/0.1 point
R1(config-subif)#ip add 12.12.12.1 255.255.255.0
R1(config-subif)#frame-relay interface-dlci 102
R1(config-fr-dlci)#class freek
R1(config-fr-dlci)#exit
R1(config-subif)#backup interface s1/1
R1(config)#interface s1/1
R1(config-if)#ip add 21.21.21.1 255.255.255.0
R1(config-if)#no shut
R1(config)#router eigrp 10
R1(config-router)#network 0.0.0.0
R1(config-router)#exit
R1(config)#map-class frame-relay freek
R1(config-map-class)#frame-relay end-to-end keepalive mode bidirectional
R3(config)#interface s1/0
R3(config-if)#encapsulation frame-relay
R3(config-if)#no shutdown
R3(config-if)#interface s1/0.1 multipoint
R3(config-subif)#ip add 12.12.12.2 255.255.255.0
R3(config-subif)#frame-relay interface-dlci 201
R3(config-fr-dlci)#class freek
%Creating new map-class.
R3(config-fr-dlci)#exit
R3(config-subif)#backup interface s1/1
R3(config)#interface s1/1
R3(config-if)#ip add 21.21.21.2 255.255.255.0
R3(config-if)#no shut
R3(config-if)#router eigrp 10
R3(config-router)#network 0.0.0.0
R3(config-router)#exit
R3(config-map-class)#frame-relay end-to-end keepalive mode bidirectional
R1#show frame-relay end-to-end keepalive
End-to-end Keepalive Statistics for Interface Serial1/0 (Frame Relay DTE)
DLCI = 102, DLCI USAGE = LOCAL, VC STATUS = ACTIVE (EEK UP)
R3(config-map-class)#do show frame-relay end-to-end keepalive
End-to-end Keepalive Statistics for Interface Serial1/0 (Frame Relay DTE)
DLCI = 201, DLCI USAGE = LOCAL, VC STATUS = ACTIVE (EEK UP)
apabila S1/0 R3 jatuh,
R1#show frame-relay end-to-end keepalive
End-to-end Keepalive Statistics for Interface Serial1/0 (Frame Relay DTE)
DLCI = 102, DLCI USAGE = LOCAL, VC STATUS = ACTIVE (EEK DOWN)
otomatis link backupnya akan digunakan.
