R3303-HP HSR6800 Routers High Availability Configuration Guide

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• To implement the first function, the source MEP first sends LTM messages to the target MEP. Based
on the LTR messages in response to the LTM messages, the path between the two MEPs can be
identified.
• In the latter case, after LT messages automatic sending is enabled, if the source MEP fails to receive
the CCM frames from the target MEP within 3.5 times the transmission interval, the link between the
two is considered faulty. LTM frames will be sent out with the target MEP as the destination and the
TTL field in the LTM frames set to the maximum value 255. Based on the LTRs that the MIPs return, the
fault source can be located.
To configure LT on MEPs:
Ste
p
Command Remarks
1. Find the path between a
source MEP and a target MEP.
cfd linktrace service-instance
instance-id mep mep-id { target-mep
target-mep-id | target-mac
mac-address } [ ttl ttl-value ] [ hw-only ]
Available in any view.
2. Enter system view.
system-view N/A
3. Enable LT messages automatic
sending.
cfd linktrace auto-detection [ size
size-value ]
Disabled by default.
Displaying and maintaining CFD
Task Command Remarks
Display CFD status.
display cfd status [ | { begin | exclude |
include } regular-expression ]
Available in any view.
Display the CFD protocol version.
display cfd version [ | { begin | exclude |
include } regular-expression ]
Available in any view.
Display MD configuration
information.
display cfd md [ | { begin | exclude |
include } regular-expression ]
Available in any view.
Display MA configuration
information.
display cfd ma [ [ ma-name ] md md-name ]
[ | { begin | exclude | include }
regular-expression ]
Available in any view.
Display service instance
configuration information.
display cfd service-instance [ instance-id ]
[ | { begin | exclude | include }
regular-expression ]
Available in any view.
Display MEP list in a service
instance.
display cfd meplist [ service-instance
instance-id ] [ | { begin | exclude | include }
regular-expression ]
Available in any view.
Display MP information.
display cfd mp [ interface interface-type
interface-number ] [ | { begin | exclude |
include } regular-expression ]
Available in any view.
Display the attribute and running
information of the MEPs.
display cfd mep mep-id service-instance
instance-id [ | { begin | exclude | include }
regular-expression ]
Available in any view.