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静态路由联动BFD多跳检测典型配置案例

组网及说明


要求正常情况下RT1和RT2互访时通过link1转发,当该路径中任意线路异常后改由link2转发,通过bfd多跳检测实现

配置步骤

RT1主要配置:

#

interface LoopBack0

ip address 1.1.1.1 255.255.255.255

#

interface GigabitEthernet0/0

ip address 10.1.123.1 255.255.255.0

#

bfd static test peer-ip 4.4.4.4 source-ip 1.1.1.1 discriminator local 1998 remote 1998

#

ip route-static 4.4.4.4 32 10.1.123.2

ip route-static 10.1.234.4 32 10.1.123.2 bfd static test

ip route-static 10.1.234.4 32 10.1.123.3 preference 65

#


RT2主要配置:

#

interface LoopBack0

ip address 4.4.4.4 255.255.255.255

#

interface GigabitEthernet0/0

ip address 10.1.234.4 255.255.255.0

#

bfd static test peer-ip 1.1.1.1 source-ip 4.4.4.4 discriminator local 1998 remote 1998

#

ip route-static 1.1.1.1 32 10.1.234.2

ip route-static 10.1.123.1 32 10.1.234.2 bfd static test

ip route-static 10.1.123.1 32 10.1.234.3 preference 65

#


验证

RT1侧:

<RT1>dis bfd session verbose

Total sessions: 1 Up sessions: 1 Init mode: Active

IPv4 static session working in control packet mode:

Session name: test

Local discr: 1998 Remote discr: 1998

Source IP: 1.1.1.1 Destination IP: 4.4.4.4

Session state: Up

Interface: N/A

Min Tx interval: 1000ms Actual Tx interval: 1000ms

Min Rx interval: 1000ms Detection time: 5000ms

Rx count: 1949 Tx count: 1962

Connection type: Indirect Up duration: 00:21:57

Hold time: 4243ms Auth mode: None

Detection mode: Async Slot: 0

Protocol: STATIC4/STATIC_IPv4

Version: 1

Diag info: No Diagnostic

静态路由:

<RT1>dis ip routing-table protocol static

Summary count : 2

Static Routing table status : <Active>

Summary count : 2

Destination/Mask Proto Pre Cost NextHop Interface

4.4.4.4/32 Static 60 0 10.1.123.2 GE0/0

10.1.234.4/32 Static 60 0 10.1.123.2 GE0/0

RT2侧:

<RT2>dis bfd session verbose

Total sessions: 1 Up sessions: 1 Init mode: Active

IPv4 static session working in control packet mode:

Session name: test

Local discr: 1998 Remote discr: 1998

Source IP: 4.4.4.4 Destination IP: 1.1.1.1

Session state: Up

Interface: N/A

Min Tx interval: 1000ms Actual Tx interval: 1000ms

Min Rx interval: 1000ms Detection time: 5000ms

Rx count: 1945 Tx count: 2113

Connection type: Indirect Up duration: 00:24:31

Hold time: 4993ms Auth mode: None

Detection mode: Async Slot: 0

Protocol: STATIC4/STATIC_IPv4

Version: 1

Diag info: No Diagnostic

静态路由:

<RT2>dis ip routing-table protocol static

Summary count : 2

Static Routing table status : <Active>

Summary count : 2

Destination/Mask Proto Pre Cost NextHop Interface

1.1.1.1/32 Static 60 0 10.1.234.2 GE0/0

10.1.123.1/32 Static 60 0 10.1.234.2 GE0/0

模拟故障,断开link1RT1之间的连通链路:

[link1]int g0/0

[link1-GigabitEthernet0/0]shutdown

RT1侧:

<RT1>%Jul 27 21:34:32:773 2023 RT1 BFD/5/BFD_CHANGE_FSM: Sess[1.1.1.1/4.4.4.4, LD/RD:1998/1998, Interface:N/A, SessType:Ctrl, LinkType:INET], Ver:1, Sta: UP->DOWN, Diag: 1 (Control Detection Time Expired)

<RT1>dis bfd session verbose

Total sessions: 1 Up sessions: 0 Init mode: Active

IPv4 static session working in control packet mode:

Session name: test

Local discr: 1998 Remote discr: 1998

Source IP: 1.1.1.1 Destination IP: 4.4.4.4

Session state: Down

Interface: N/A

Min Tx interval: 1000ms Actual Tx interval: 1000ms

Min Rx interval: 1000ms Detection time: 5000ms

Rx count: 2232 Tx count: 2254

Connection type: Indirect Up duration: 00:00:00

Hold time: 0ms Auth mode: None

Detection mode: Async Slot: 0

Protocol: STATIC4/STATIC_IPv4

Version: 1

Diag info: Control Detection Time Expired

<RT1>dis ip routing-table protocol static

Summary count : 2

Static Routing table status : <Active>

Summary count : 2

Destination/Mask Proto Pre Cost NextHop Interface

4.4.4.4/32 Static 60 0 10.1.123.2 GE0/0

10.1.234.4/32 Static 65 0 10.1.123.3 GE0/0

Static Routing table status : <Inactive>

Summary count : 0

RT2侧:

<RT2>%Jul 27 21:36:36:615 2023 RT2 BFD/5/BFD_CHANGE_FSM: Sess[4.4.4.4/1.1.1.1, LD/RD:1998/1998, Interface:N/A, SessType:Ctrl, LinkType:INET], Ver:1, Sta: UP->DOWN, Diag: 1 (Control Detection Time Expired)

<RT2>dis ip routing-table protocol static

Summary count : 2

Static Routing table status : <Active>

Summary count : 2

Destination/Mask Proto Pre Cost NextHop Interface

1.1.1.1/32 Static 60 0 10.1.234.2 GE0/0

10.1.123.1/32 Static 65 0 10.1.234.3 GE0/0

Static Routing table status : <Inactive>

Summary count : 0

<RT2>dis bfd session ver

Total sessions: 1 Up sessions: 0 Init mode: Active

IPv4 static session working in control packet mode:

Session name: test

Local discr: 1998 Remote discr: 1998

Source IP: 4.4.4.4 Destination IP: 1.1.1.1

Session state: Down

Interface: N/A

Min Tx interval: 1000ms Actual Tx interval: 1000ms

Min Rx interval: 1000ms Detection time: 5000ms

Rx count: 2118 Tx count: 2367

Connection type: Indirect Up duration: 00:00:00

Hold time: 0ms Auth mode: None

Detection mode: Async Slot: 0

Protocol: STATIC4/STATIC_IPv4

Version: 1

Diag info: Control Detection Time Expired

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