OSPF中的frame-relay（5） NBMA-nonbroadcast

hostname R1
no ip domain lookup
!
interface Loopback0
 ip address 2.2.2.2 255.255.255.255

interface Serial1/0
 ip address 192.1.1.1 255.255.255.0
 encapsulation frame-relay
//在这里虽然配置了frame-relay map ip，但是，通过返向地址解释，依
//然可以获得到达对方的DLCI，因为在帧中继交换机上配置了PVC
 frame-relay map ip 192.1.1.2 100
 frame-relay map ip 192.1.1.3 200
 frame-relay lmi-type ansi
!
router ospf 1
 network 2.2.2.2 0.0.0.0 area 0
 network 192.1.1.0 0.0.0.255 area 0
由于是非广播型的NBMA，所以要在HUB上指定neighbor
 neighbor 192.1.1.2
 neighbor 192.1.1.3

R2#show ip ospf inter s 1/0
Serial1/0 is up, line protocol is up
  Internet Address 192.1.1.2/24, Area 0
  Process ID 1, Router ID 1.1.1.1, Network Type NON_BROADCAST, Cost: 64   //可以看到接口的类型为非广播类型的
  Transmit Delay is 1 sec, State DROTHER, Priority 0
  Designated Router (ID) 2.2.2.2, Interface address 192.1.1.1
  No backup designated router on this network
  Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
    oob-resync timeout 120
    Hello due in 00:00:27
  Index 2/2, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 1, maximum is 1
  Last flood scan time is 4 msec, maximum is 4 msec
  Neighbor Count is 1, Adjacent neighbor count is 1
    Adjacent with neighbor 2.2.2.2  (Designated Router)
  Suppress hello for 0 neighbor(s)

R1#show ip ospf neig

Neighbor ID     Pri   State           Dead Time   Address         Interface
1.1.1.1           0   FULL/DROTHER    00:01:43    192.1.1.2       Serial1/0
3.3.3.3           0   FULL/DROTHER    00:01:49    192.1.1.3       Serial1/0

!
hostname R2
!
no ip domain lookup
!
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!        
interface Serial1/0
 ip address 192.1.1.2 255.255.255.0
 encapsulation frame-relay
//将接口的优先级配置为0，使他不参与DR和BDR的选举
 ip ospf priority 0

 frame-relay map ip 192.1.1.1 100   //这一句其实可以不配，因为在帧中继交换机上已经配置了PVC，可以通过返向ARP获取DLCI 号
 frame-relay map ip 192.1.1.3 100   //这一句必须配置，在帧中继交换机上没有配置，为了解决MA的下一跳问题，必须指定到达R3的DLCI号
 frame-relay lmi-type ansi

R2#show frame-relay map
Serial1/0 (up): ip 192.1.1.1 dlci 100(0x64,0x1840), static,
              CISCO, status defined, active
Serial1/0 (up): ip 192.1.1.3 dlci 100(0x64,0x1840), static,
              CISCO, status defined, active

R2#show ip route

Gateway of last resort is not set

     1.0.0.0/32 is subnetted, 1 subnets
C       1.1.1.1 is directly connected, Loopback0
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 192.1.1.1, 00:28:43, Serial1/0
     3.0.0.0/32 is subnetted, 1 subnets
O       3.3.3.3 [110/65] via 192.1.1.3, 00:28:43, Serial1/0
C    192.1.1.0/24 is directly connected, Serial1/0

 

hostname R3
!
no ip domain lookup
!
interface Loopback0
 ip address 3.3.3.3 255.255.255.255
!        
interface Serial1/0
 ip address 192.1.1.3 255.255.255.0
 encapsulation frame-relay
 ip ospf priority 0
 serial restart-delay 0
 no fair-queue
 frame-relay map ip 192.1.1.1 200
 frame-relay map ip 192.1.1.2 200
 frame-relay lmi-type ansi
router ospf 1
 log-adjacency-changes
 network 3.3.3.3 0.0.0.0 area 0
 network 192.1.1.0 0.0.0.255 area 0

R3#show frame-relay map
Serial1/0 (up): ip 192.1.1.1 dlci 200(0xC8,0x3080), static,
              CISCO, status defined, active
Serial1/0 (up): ip 192.1.1.2 dlci 200(0xC8,0x3080), static,
              CISCO, status defined, active
R3#show ip route

Gateway of last resort is not set

     1.0.0.0/32 is subnetted, 1 subnets
O       1.1.1.1 [110/65] via 192.1.1.2, 00:30:18, Serial1/0
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 192.1.1.1, 00:30:18, Serial1/0
     3.0.0.0/32 is subnetted, 1 subnets
C       3.3.3.3 is directly connected, Loopback0
C    192.1.1.0/24 is directly connected, Serial1/0

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