Frame Relay End-to-End Keepalive

只要學習過Frame Relay的同學都知道,Frame Relay兩端的FRAD(Frame Relay Access Device),只透過Frame Relay PVC(LMI)來跟Frame Relay Switch Keepalive,藉此,Frame Relay Switch可以得知兩端的PVC是否正常連通(Active),但是對於FRAD來說,它們只能透過LMI查詢得知PVC的狀態,而無法直接跟另一端的FRAD保持Keepalive。

因此我在此介紹一個很特別的技巧,那就是End-to-End Keepalive,設定上很簡單,只要利用map-class的設定再加上end-to-end function即可:

R1(config)#map-class frame-relay EtoE
R1(config-map-class)#frame-relay end-to-end keepalive mode bidirection
! 你可以使用bidirection or request or reply or passive-reply等不同的模式
! 詳情請參考http://www.cisco.com/en/US/docs/ios/12_0t/12_0t5/feature/guide/FRKeep.html

R1(config)#int s0/0/0.1
R1(config-subif)#frame-relay interface-dlci 102
R1(config-fr-dlci)#class EtoE

R2(config)#map-class frame-relay EtoE
R2(config-map-class)#frame-relay end-to-end keepalive mode bidirection

R1(config)#int s0/0/0.1
R1(config-subif)#frame-relay interface-dlci 201
R1(config-fr-dlci)#class EtoE
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