How to map Frame-Relay DLCI and IP address without "frame-relay map" command in Frame-relay Multipoint Sub-Interface?

在準備CCIE Lab的過程最有趣的事情就是不斷有一些特殊的tip & trick讓你驚奇,原本以為某個主題都已經了解很透徹了,但是往往因為一個特別的題目的出現讓你再度覺得學藝不精,原來一山還有一山高。

很多人都知道設定Frame-relay map的方式不外乎兩種:
  • Inverse-ARP(default enable)(Point-to-Point)
  • Frame-Relay map(Multipoint)

不過如果有一個題目要求你在Frame-relay Multipoint sub-interface中不能使用Frame-relay map時,你該怎麼辦?
以下就是這個主題的解答,請參考:

假設R1,R2,R3是Frame-Relay Hub-and-Spoke Topology(NBMA)
R1-R2 DLCI:102
R1-R3 DLCI:103
R2-R1 DLCI:201
R3-R1 DLCI:301

R1(config)#int s0/0
R1(config-if)#encapsulation frame-relay
R1(config-if)#int s0/0.1 multipoint
R1(config-subif)#ip address 172.16.1.1 255.255.255.0
R1(config-subif)#frame-relay interface-dlci 102
R1(config-subif)#frame-relay interface-dlci 103

R2(config)#int s0/0
R2(config-if)#encapsulation frame-relay
R2(config-if)#int s0/0.1 point-to-point
R2(config-subif)#ip address 172.16.1.2 255.255.255.0
R2(config-subif)#frame-relay interface-dlci 201

R3(config)#int s0/0
R3(config-if)#encapsulation frame-relay
R3(config-if)#int s0/0.1 point-to-point
R3(config-subif)#ip address 172.16.1.3 255.255.255.0
R3(config-subif)#frame-relay interface-dlci 301

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