H3C Technologies H3C S6800 Series Switches - Manual (Page 86)

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Enabling route and label recording
Perform this task to record the nodes that an MPLS TE tunnel traverses and the label assigned by each
node. The recorded information helps you know about the path used by the MPLS TE tunnel and the label
distribution information, and when the tunnel fails, it helps you locate the fault.
To enable route and label recording:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter MPLS TE tunnel
interface view.
interface tunnel tunnel-number [ mode
mpls-te ]
N/A
3. Record routes or record both
routes and labels.
• To record routes:
mpls te record-route
• To record both routes and labels:
mpls te record-route label
By default, both route
recording and label
recording are disabled.
Enabling loop detection
Enabling loop detection also enables the route recording function, regardless of whether you have
configured the mpls te record-route command. Loop detection enables each node of the tunnel to detect
whether a loop has occurred according to the recorded route information.
To enable loop detection:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter MPLS TE tunnel interface
view. interface tunnel tunnel-number
[ mode mpls-te ]
N/A
3. Enable loop detection. mpls te loop-detection
By default, loop detection is
disabled.
Configuring tunnel setup retry
If the ingress node fails to establish an MPLS TE tunnel, it waits for the retry interval, and then tries to set
up the tunnel again. It repeats this process until the tunnel is established or until the number of attempts
reaches the maximum. If the tunnel cannot be established when the number of attempts reaches the
maximum, the ingress waits for a longer period and then repeats the previous process.
To configure tunnel setup retry:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter MPLS TE tunnel interface
view. interface tunnel tunnel-number
[ mode mpls-te ]
N/A
3. Configure maximum number
of tunnel setup attempts.
mpls te retry times
By default, the maximum number of
attempts is 3.
4. Configure the retry interval. mpls te timer retry seconds
By default, the retry interval is 2
seconds.