Configuring Ldp Loop Detection Control - H3C S9500 Series Operation Manual

Operation Manual – MPLS
H3C S9500 Series Routing Switches
Table 2-11 Configure Hello transport-address
Configure Hello transport-address
Return
transport-address
Transport-address defaults to the MPLS LSR ID of the current LSR.
If there are multiple links connecting two neighboring LSRs, all the LDP-enabled
interfaces on the links connecting LSR and its neighbor must have the same transport
address. You are recommended to use the same interface address for all of them, that
is, LSR-ID.

2.3.5 Configuring LDP Loop Detection Control

I. Enabling loop detection
You can enable or disable the loop detection function during LDP signaling process.
The loop detection includes maximum hop count mode and path vector mode.
The maximum hop count method refers to that the hop-count information is contained
in the message bound with the forwarding label, and the value pluses one for each hop.
When the value exceeds the threshold value, it is considered that a loop presents, and
the process for establishing LSP is terminated.
The path vector method refers to that the path information is recorded in the message
bound with the forwarding label, and, for every hop, the corresponding router checks if
its ID is contained in this record. If not, the router adds its ID into the record; and if yes,
it indicates that a loop presents and the process for establishing LSP is terminated.
When this method is used, if the defined maximum value is exceeded, it is considered
that a loop happens and the LSP establishment fails.
Perform the following configuration in the system view.
Table 2-12 Enable loop detection
Enable loop detection
Disable loop detection
By default, the loop detection is disabled.
Operation
to the default Hello
Operation
Chapter 2 MPLS Basic Capability Configuration
Command
mpls ldp transport-ip
ip-address }
undo mpls ldp transport-ip
mpls ldp loop-detect
undo mpls ldp loop-detect
2-7
interface
{
Command
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