H3C Technologies H3C S12500 Series Switches User Manual
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<SwitchB> system-view
[SwitchB] interface loopback 1
[SwitchB-LoopBack1] bfd min-transmit-interval 500
[SwitchB-LoopBack1] bfd min-receive-interval 500
[SwitchB-LoopBack1] bfd detect-multiplier 9
[SwitchB-LoopBack1] quit
[SwitchB] ip route-static 121.1.1.0 24 1.1.1.9 bfd control-packet bfd-source 2.2.2.9
[SwitchB] ip route-static 121.1.1.0 24 vlan-interface 13 13.1.1.2 preference 65
[SwitchB] quit
3.
Verify the configuration:
# Display BFD sessions on Switch A.
<SwitchA> display bfd session
Total session number: 1 Up session number: 0 Init mode: Active
IPv4 session working under Ctrl mode:
LD/RD SourceAddr DestAddr State Holdtime Interface
4/7 1.1.1.9 2.2.2.9 Up 2000ms Loop1
# Display static routes on Switch A.
<SwitchA> display ip routing-table protocol static
Public Routing Table : Static
Summary Count : 2
Static Routing table Status : <Active>
Summary Count : 1
Destination/Mask Proto Pre Cost NextHop Interface
120.1.1.0/24 Static 60 0 2.2.2.9 Vlan10
Static Routing table Status : <Inactive>
Summary Count : 1
Destination/Mask Proto Pre Cost NextHop Interface
120.1.1.0/24 Static 65 0 10.1.1.100 Vlan11
The output shows that Switch A and Switch B communicates through VLAN-interface 10. Then the
link over VLAN-interface 10 fails.
# Enable BFD debugging.
<SwitchA> debugging bfd event
<SwitchA> debugging bfd scm
<SwitchA> terminal debugging
%Oct 10 10:18:18:672 2010 SwitchA BFD/4/LOG:Sess[1.1.1.9/2.2.2.9, Loop1,Ctrl], Sta:
UP->DOWN, Diag: 1
* Oct 10 10:18:18:672 2010 SwitchA BFD/7/EVENT:Send sess-down Msg,
[Src:1.1.1.9,Dst:2.2.2.9, Loop1,Ctrl], instance:0, protocol:STATIC
The output shows that Switch A can quickly detect the failure.
# Display static routes on Switch A again.
<SwitchA> display ip routing-table protocol static
Public Routing Table : Static