INE R&S ATC028 - Frame-Relay End-to-End Keepalives

Frame Relay End-to-End Keepalives

• End-to-End LMI used to track circuit status by default
– If one side is down, other side should be INACTIVE

• Certain design break end-to-end LMI
– Frame Relay provider handoffs
– Frame Relay over MPLS L2VPN

• Frame Relay EEK adds new keepalive between DTEs

Frame Relay End-to-End Keepalives

• Configuration
– map-class frame-relay [name]
  • Not class-map
– frame-relay end-to-end keepalive mode [bidirectional | passive-reply | reply | request]
  • If one side replies, other must request
– class [name]
– frame-relay class [name]

• Verification
– show frame-relay pvc

範例中已經設定好Partial Mesh...並且R1與R2, R3均可以Ping通

於R2與R1啟動End-to-End Keepalive.......在此...我們就不列出R3了

@R2
int s0/0
  ip address 123.0.0.2/24
  encapsulation frame-relay
  frame-relay map ip 123.0.0.1 201 broadcast
  frame-relay map ip 123.0.0.3 201
  frame-relay class EEK

map-class frame-relay EEK
  frame-relay end-to-end keepalive mode reply

@R1 --- 這樣的設定不是很好...會使得R1與R3之間就不會通了, 因為EEK的關係
int s0/0
  ip address 123.0.0.1/24
  encapsulation frame-relay
  frame-relay map ip 123.0.0.2 102 broadcast
  frame-relay map ip 123.0.0.3 103 broadcast
  frame-relay class EEK

map-class frame-relay EEK
  frame-relay end-to-end keepalive mode request

@R1 --- 改用interface-dlci設定...使得R1與R2之間EEK可以用...R1與R3之間正常囉.......
int s0/0
  ip address 123.0.0.1/24
  encapsulation frame-relay
  frame-relay map ip 123.0.0.2 102 broadcast
  frame-relay map ip 123.0.0.3 103 broadcast
  frame-relay interface-dlci 102
    class EEK

map-class frame-relay EEK
  frame-relay end-to-end keepalive mode request

驗證：
show frame-relay pvc ｜ include dlci