OSPF Point-to-Multipoint Networks

OSPF – Hub and spoke Topology

Dans une architecture « Hub and spoke » Frame relay, les interfaces peuvent être configurées dans 4 modes de communication OSPF :

R1(config)#int s0/0
R1(config-if)#ip ospf network ?
broadcast       Specify OSPF broadcast multi-access network
non-broadcast       Specify OSPF NBMA network
point-to-multipoint Specify  OSPF point-to-multipoint network
point-to-point      Specify OSPF point-to-point network

 

Configuration de tous les routeurs en mode « point-to-mulitipoint »

R1#configure t
R1(config)#int s0/0
R1(config-if)#ip ospf network point-to-multipoint

Vérifications

R1#show ip ospf interface s0/0
Serial0/0 is up, line protocol is up
  Internet Address 10.1.1.1/24, Area 0
  Process ID 1, Router ID 1.1.1.1, Network Type POINT_TO_MULTIPOINT, Cost: 64
  Transmit Delay is 1 sec, State POINT_TO_MULTIPOINT,
  Timer intervals configured, Hello 5, Dead 20, Wait 20, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:03
  Supports Link-local Signaling (LLS)
  Index 2/2, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 2, maximum is 2
  Last flood scan time is 0 msec, maximum is 4 msec
  Neighbor Count is 3, Adjacent neighbor count is 3
    Adjacent with neighbor 4.4.4.4
    Adjacent with neighbor 3.3.3.3
    Adjacent with neighbor 2.2.2.2
  Suppress hello for 0 neighbor(s)

Dans cette configuration, le routage des routeurs « spoke » converge vers le routeur « hub » , une route host (/32) est également ajoutée :

R1#show ip route ospf
O    2.0.0.0/8 [110/65] via 10.1.1.2, 00:01:47, Serial0/0
O    3.0.0.0/8 [110/65] via 10.1.1.3, 00:01:47, Serial0/0
O    4.0.0.0/8 [110/65] via 10.1.1.4, 00:01:47, Serial0/0
     10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
O       10.1.1.2/32 [110/64] via 10.1.1.2, 00:01:47, Serial0/0
O       10.1.1.3/32 [110/64] via 10.1.1.3, 00:01:47, Serial0/0
O       10.1.1.4/32 [110/64] via 10.1.1.4, 00:01:47, Serial0/0

R2#show ip route ospf
O    1.0.0.0/8 [110/65] via 10.1.1.1, 00:02:15, Serial0/0
O    3.0.0.0/8 [110/129] via 10.1.1.1, 00:02:15, Serial0/0
O    4.0.0.0/8 [110/129] via 10.1.1.1, 00:02:15, Serial0/0
     10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
O       10.1.1.3/32 [110/128] via 10.1.1.1, 00:02:15, Serial0/0
O       10.1.1.1/32 [110/64] via 10.1.1.1, 00:02:15, Serial0/0
O       10.1.1.4/32 [110/128] via 10.1.1.1, 00:02:15, Serial0/0

R3#show ip route ospf
O    1.0.0.0/8 [110/782] via 10.1.1.1, 00:02:32, Serial1/0
O    2.0.0.0/8 [110/846] via 10.1.1.1, 00:02:32, Serial1/0
O    4.0.0.0/8 [110/846] via 10.1.1.1, 00:02:32, Serial1/0
     10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
O       10.1.1.2/32 [110/845] via 10.1.1.1, 00:02:32, Serial1/0
O       10.1.1.1/32 [110/781] via 10.1.1.1, 00:02:32, Serial1/0
O       10.1.1.4/32 [110/845] via 10.1.1.1, 00:02:32, Serial1/0

R4#show ip route ospf
O    1.0.0.0/8 [110/65] via 10.1.1.1, 00:02:50, Serial0/0
O    2.0.0.0/8 [110/129] via 10.1.1.1, 00:02:50, Serial0/0
O    3.0.0.0/8 [110/129] via 10.1.1.1, 00:02:50, Serial0/0
     10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
O       10.1.1.2/32 [110/128] via 10.1.1.1, 00:02:50, Serial0/0
O       10.1.1.3/32 [110/128] via 10.1.1.1, 00:02:50, Serial0/0
O       10.1.1.1/32 [110/64] via 10.1.1.1, 00:02:50, Serial0/0
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