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MPLS Guide
5.1.3.4
LDP uses the logger interface to generate debug information relating to session
setup and teardown, LDP events, label exchanges, and packet dumps. Per-session
tracing can be performed. Refer to the 7705 SAR System Management Guide for
logger configuration information.
5.1.3.5
All interaction occurs between LDP and the service manager, since LDP is used
primarily to exchange labels for Layer 2 services. In this context, the service manager
informs LDP when an LDP session is to be set up or torn down, and when labels are
to be exchanged or withdrawn. In turn, LDP informs the service manager of relevant
LDP events, such as connection setups and failures, timeouts, and labels signaled
or withdrawn.
5.1.4 Execution Flow
LDP activity in the 7705 SAR is limited to service-related signaling. Therefore, the
configurable parameters are restricted to system-wide parameters, such as hello and
keepalive timeouts.
5.1.4.1
MPLS must be enabled when LDP is initialized. LDP makes sure that the various
prerequisites are met, such as ensuring that the system IP interface and the label
manager are operational, and ensuring that there is memory available. It then
allocates a pool of memory to itself and initializes its databases.
5.1.4.2
In order for a targeted LDP session to be established, an adjacency has to be
created. The LDP extended discovery mechanism requires hello messages to be
exchanged between two peers for session establishment. Once the adjacency is
established, session setup is attempted.
3HE 18686 AAAB TQZZA
Logger
Service Manager
Initialization
Session Lifetime
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Label Distribution Protocol
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