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Cisco 12000/10700 v3.1.1 Router Manager User Guide
OL-4455-01
Chapter15 MPLS Management
Fault Management for MPLS LDP
• hopCountAndPathVector—Loop Detection is supported by both Hop Count And Path Vector.
Since Loop Detection is determined during Session Initialization, an individual session may not be
running with loop detection. This object simply gives an indication of whether or not the LSR has
the ability to support Loop Detection and which types.
General LDP Status
The General LDP Status area displays a table that displays information about the MPLS Label
Distribution Protocol Entities which exist on this Label Switch Router (LSR). An entry in this table
represents an LDP entity. An entry can be created by a Network Administrator or by an SNMP agent as
instructed by LDP.
The table displays the following information:
Local LDP Id—Displays the LDP identifier.
Index—This index is used as a secondary index to uniquely identify this row.
Protocol Version—The version number of the LDP protocol that will be used in the session initialization
message.
Admin Status—The administrative status of this LDP entity.
Operational Status—The operational status of this LDP entity.
TCP Dsc Port—The TCP Discovery Port for LDP. The default value (646) is the well-known value of
this port.
UDP Dsc Port—The UDP Discovery Port for LDP. The default value (646) is the well-known value for
this port.
Maximum PDU Length—The maximum PDU Length that is sent in the Common Session Parameters of
an Initialization Message. A value of 255 or less specifies the default maximum length of 4096 octets.
Keep Alive Hold Timer—The two octet value which is the proposed keep alive hold timer for this LDP
Entity.
Hello Hold Timer—The two octet value which is the proposed Hello hold timer for this LDP Entity. A
value of 0 means use the default, which is 15 seconds for Link Hellos and 45 seconds for Targeted Hellos.
A value of 65535 means infinite.
Init Session Threshold—When attempting to establish a session with a Peer, the given LDP Entity should
send out the SNMP notification, Init Session Threshold, when the number of Session Initialization
messages sent exceeds this threshold.
Label Distribution Method—For any given LDP session, the method of label distribution must be
specified (downstreamOnDemand, or downstreamUnsolicited).
Label Retention Mode—The LDP Entity can be configured to use either conservative or liberal label
retention mode. If the value of this object is conservative then advertised label mappings are retained
only if they will be used to forward packets, that is, if label came from a valid next hop. If the value of
this object is liberal then all advertised label mappings are retained whether they are from a valid next
hop or not.
PVL—If the value of this object is 0 (zero) then Loop Detection for Path Vectors is disabled. Otherwise,
if this object has a value greater than zero, then Loop Detection for Path Vectors is enabled, and the Path
Vector Limit is this value.
HopCountLimit—Maximum allowable value for Hop count when Loop Detection using Hop Counters
as a metric.
Target Peer—If this LDP entity uses targeted peer then set this to “true”.
Target Peer Address Type—The type of the internetwork layer address used for the Extended Discovery.