Ldp Loop Detection Control - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
Note:
For ATM, interface configuration commands are only available for the ATM
subinterfaces in point-to-point mode.
For those link layer protocols that do not support broadcast packets, for example, frame
relay and ATM, you must configure broadcast attributes, for transmission of broadcast
and multi-cast packets.
II. Configuring hello transport-address
The transport-address discussed here refers to the address carried in the transport
address field TLV in hello messages. Generally, transport-address is the MPLS LSR ID
of the current LSR, but other configurations may be required in some applications.
Perform the following configurations in the interface view.
Table 2-12 Configure hello transport-address
Configure a hello transport-address
Restore
transport-address
Transport-address defaults to the MPLS LSR ID of the current LSR.
When MPLS LDP is enabled on multiple directly connected links, these links must be
configured with the same transport address. It is recommended that you take the
default LSR-ID as the transport address; otherwise, the LDP session may not be well
established.

2.3.5 LDP Loop Detection Control

I. Enabling loop detection
It is used to enable or disable the loop detection function during LDP signaling process.
The loop detection includes maximum hop count mode and path vector mode.
In maximum hop count mode, hop count information is included in label binding
information and is added by 1 when the packet passes through another hop. When the
value exceeds the maximum, it is reckoned that loop appears, so LSP setup process
terminates.
In path vector mode, path information is included in the label binding information. Each
time the packet passes through a hop, the corresponding router will check whether its
Operation
the default hello
3Com Corporation
2-8
Chapter 2 MPLS Basic Capability Configuration
Command
mpls ldp transport-ip { interface |
ip-address }
undo mpls ldp transport-ip