H3C Technologies H3C S12500 Series Switches - Manual (Page 209)

198
Step Command Remarks
9. Configure the detection time
multiplier.
bfd detect-multiplier value
Optional.
5 by default.
In Figure 47 for example, if you configure the Desired Min TX Interval as 100 milliseconds, Required Min
RX Interval as 300 milliseconds, and Detect Mult as 5 on Router A, and configure the Desired Min TX
Interval as 150 milliseconds, Required Min RX Interval as 400 milliseconds, and Detect Mult as 10 on
Router B,
• The actual transmitting interval on Router A is 400 milliseconds, which is the greater value between
the minimum interval for transmitting BFD control packets on Router A (100 milliseconds) and the
minimum interval for receiving BFD control packets on Router B (400 milliseconds).
• The actual transmitting interval on Router B is 300 milliseconds, which is the greater value between
the minimum interval for transmitting BFD control packets on Router B (150 milliseconds) and the
minimum interval for receiving BFD control packets on Router A (300 milliseconds).
• The actual detection time on Router A is 3000 milliseconds, which is 10 × 300 milliseconds (Detect
Mult on Router B × actual transmitting interval on Router B).
• The actual detection time on Router B is 2000 milliseconds, which is 5 × 400 milliseconds (Detect
Mult on Router A × actual transmitting interval on Router A).
NOTE:
•
At least one end must operate in the active mode for a BFD session to be established.
• If the detection time on an aggregate interface is small, configure the link-delay 0 or link-delay msec 0
command on the member ports so that the state (up or down) change of the member ports does not
affect the BFD session.
Displaying and maintaining BFD
Task Command Remarks
Display information about
BFD-enabled interfaces. display bfd interface [ verbose ] [ | { begin
| exclude | include } regular-expression ]
Available in any view.
Display information about enabled
BFD debugging. display bfd debugging-switches [ | { begin
| exclude | include } regular-expression ]
Available in any view.
Display BFD session information (in
standalone mode).
display bfd session [ slot slot-number [ all |
verbose ] | verbose ] [ | { begin | exclude
| include } regular-expression ]
Available in any view.
Display BFD session information (in
IRF mode).
display bfd session [ chassis
chassis-number slot slot-number [ all |
verbose ] | verbose ] [ | { begin | exclude
| include } regular-expression ]
Available in any view.
Clear BFD session statistics (in
standalone mode). reset bfd session statistics [ slot
slot-number ]
Available in user view.
Clear BFD session statistics (in IRF
mode). reset bfd session statistics [ chassis
chassis-number slot slot-number ]
Available in user view.