3Com 3C13636 Configuration Manual page 854

3Com Router 3000 Ethernet Family
Configuration Guide
ID is recorded in the path information. If not, the router just adds its ID. If yes, it means
loop appears, so LSP setup process terminates.
Perform the following configurations in the system view.
Table 2-13 Enable loop detection
Enable loop detection
Disable loop detection
By default, the loop detection is disabled.
II. Setting the maximum hop count for loop detection
When maximum hop count mode is adopted for loop detection, the maximum
hop-count value can be defined. And if the maximum value is exceeded, it is
considered that a loop happens and the LSP establishment fails.
Perform the following configurations in the system view.
Table 2-14 Set the maximum hop count for loop detection
Set maximum hop count for loop
detection
Restore default maximum hop count
The maximum hop count defaults to 32.
III. Setting the maximum value of the path vector
When path vector mode is adopted for loop detection, it is also necessary to specify the
maximum value of LSP path. In this way, when one of the following conditions is met, it
is considered that a loop happens and the LSP establishment fails.
1) The record of this LSR already exists in the path vector recording table.
2) The path hop count exceeds the maximum value set here.
Perform the following configurations in the system view.
Table 2-15 Set the maximum value of the path vector
Set maximum value of the path vector
Remove maximum value setting for path
vector
Operation
Operation
Operation
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2-9
Chapter 2 MPLS Basic Capability Configuration
Command
mpls ldp loop-detect
undo mpls ldp loop-detect
Command
mpls ldp hops-count hop-number
undo mpls ldp hops-count
Command
mpls ldp path-vectors pv-number
undo mpls ldp path-vectors