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如图1所示#xff0c;SwitchA、SwitchB和SwitchC之间运行OSPF#xff0c;SwitchA和SwitchB之间的交换机仅作透传功能。现在需要SwitchA和SwitchB能快速感应它们之间的链路状态#xff0c;当链路SwitchA-SwitchB发生故障时#xff0c;业务能快速切换到备份链路Swi…组网需求
如图1所示SwitchA、SwitchB和SwitchC之间运行OSPFSwitchA和SwitchB之间的交换机仅作透传功能。现在需要SwitchA和SwitchB能快速感应它们之间的链路状态当链路SwitchA-SwitchB发生故障时业务能快速切换到备份链路SwitchA-SwitchC-SwitchB上
说明
请确保该场景下互联接口的STP处于未使能状态。因为在使能STP的环形网络中如果用交换机的VLANIF接口构建三层网络会导致某个端口被阻塞从而导致三层业务不能正常运行 配置思路
采用如下思路配置OSPF与BFD联动 在各交换机上配置OSPF基本功能实现整个OSPF网络的互通。 在各交换机上配置OSPF与BFD联动功能实现当SwitchA和SwitchB之间的链路出现故障时快速的切换到备份链路。 操作步骤
配置各接口所属的VLAN
# 配置SwitchA。SwitchB和SwitchC的配置与SwitchA类似。
[zhongwanzhi]vlan batch 10 30
[zhongwanzhi]interface GigabitEthernet 0/0/1
[zhongwanzhi-GigabitEthernet0/0/1]port link-type trunk
[zhongwanzhi-GigabitEthernet0/0/1]port trunk allow-pass vlan 10
[zhongwanzhi-GigabitEthernet0/0/1]quit
[zhongwanzhi]interface GigabitEthernet 0/0/2
[zhongwanzhi-GigabitEthernet0/0/2]port link-type tr
[zhongwanzhi-GigabitEthernet0/0/2]port link-type trunk
[zhongwanzhi-GigabitEthernet0/0/2]port trunk allow-pass vlan 30
[zhongwanzhi-GigabitEthernet0/0/2]quit
配置各VLANIF接口的IP地址
# 配置SwitchA。SwitchB和SwitchC的配置与SwitchA类似
[zhongwanzhi]interface Vlanif 30
[zhongwanzhi-Vlanif30]ip address 10.3.3.1 24
[zhongwanzhi-Vlanif30]quit
[zhongwanzhi]interface Vlanif 10
[zhongwanzhi-Vlanif10]ip address 10.1.1.1 24
[zhongwanzhi-Vlanif10]quit
配置OSPF基本功能
# 配置SwitchA、SwitchB和SwitchC的配置与SwitchA类似
[zhongwanzhi]ospf 1 router-id 10.10.10.1
[zhongwanzhi-ospf-1]area 0
[zhongwanzhi-ospf-1-area-0.0.0.0]network 10.1.1.0 0.0.0.255
[zhongwanzhi-ospf-1-area-0.0.0.0]network 10.3.3.0 0.0.0.255
[zhongwanzhi-ospf-1-area-0.0.0.0]quit
[zhongwanzhi-ospf-1]quit
# 配置完成后执行命令display ospf peer可以看到SwitchASwitchB和SwitchC之间互相建立了邻接关系。以SwitchA的显示结果为例
[zhongwanzhi]display ospf peer OSPF Process 1 with Router ID 10.10.10.1Neighbors Area 0.0.0.0 interface 10.1.1.1(Vlanif10)s neighborsRouter ID: 10.10.10.3 Address: 10.1.1.2 State: Full Mode:Nbr is Master Priority: 1DR: 10.1.1.1 BDR: 10.1.1.2 MTU: 0 Dead timer due in 34 sec Retrans timer interval: 5 Neighbor is up for 00:00:20 Authentication Sequence: [ 0 ] [zhongwanzhi]display ospf peerOSPF Process 1 with Router ID 10.10.10.1Neighbors Area 0.0.0.0 interface 10.1.1.1(Vlanif10)s neighborsRouter ID: 10.10.10.3 Address: 10.1.1.2 State: Full Mode:Nbr is Master Priority: 1DR: 10.1.1.1 BDR: 10.1.1.2 MTU: 0 Dead timer due in 34 sec Retrans timer interval: 5 Neighbor is up for 00:00:47 Authentication Sequence: [ 0 ]
配置OSPF与BFD联动
# 在SwitchA上配置OSPF与BFD联动功能。SwitchB和SwitchC的配置与SwitchA类似。
[zhongwanzhi]bfd
[zhongwanzhi-bfd]quit
[zhongwanzhi]ospf 1
[zhongwanzhi-ospf-1]bfd all-interfaces enable
[zhongwanzhi-ospf-1]quit
# 配置完成后在SwitchA或SwitchB、SwitchC上执行display ospf bfd session all命令可以看到BFD会话的状态为Up。以SwitchA的显示为例。
[zhongwanzhi]display ospf bfd session all OSPF Process 1 with Router ID 10.10.10.1Area 0.0.0.0 interface 10.1.1.1(Vlanif10)s BFD SessionsNeighborId:10.10.10.3 AreaId:0.0.0.0 Interface:Vlanif10 BFDState:up rx :1000 tx :1000 Multiplier:3 BFD Local Dis:8192 LocalIpAdd:10.1.1.1RemoteIpAdd:10.1.1.2 Diagnostic Info:No diagnostic information
