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xStack
LDP Control Mode
LDP Label Retention
LDP Loop Detection
Path Vector Limit (1-
255)
Hop Count Limit (1-255)
LDP Authentication
LDP LSR ID
LDP PHP
Click the Apply button to accept the changes made.
LDP Statistic Table
This window is used to clear the LDP statistics.
To view this window, click VPN > MPLS > LDP > LDP Statistic Table as shown below:
DES-3810 Series Layer 3 Managed Ethernet Switch Web UI Reference Guide
transport address.
Select the LSP control mode used here. In Independent LSP Control, each LSR
independently binds a label to a FEC and distributes the binding to its label distribution
peers. In Ordered LSP Control, an LSR only binds a label to a FEC if it is the egress LSR
for that FEC, or if it has already received a label binding for that FEC from its next hop for
that FEC.
Select the LDP label retention mode here. If the label distribution method is Downstream-
Unsolicited and the label retention mode is Conservative, it will discard the bindings once
the LSR have received label bindings from the LSRs, which are not its next hop for that
FEC. If the label retention mode is Liberal, it will maintain the bindings. This helps to
speed up the setup of LSP in case there is a change in the next hop.
Enable or disable the LDP loop detection mode here. The LDP loop detection mechanism
makes use of the Path Vector and Hop Count TLVs carried by the label request and
labeling mapping messages to detect looping LSPs.
Enter the path vector limit value used here. This value must be between 1 and 255.
Enter the hop count limit used here. This value must be between 1 and 255.
Enable or disable the LDP authentication option here. If the authentication is enabled, the
LSR applies the MD5 algorithm to compute the MD5 digest for the TCP segment that will
be sent to the peer. This computation makes use of the peer password as well as the
TCP segment. When the LSR receives a TCP segment with an MD5 digest, it validates
the segment by calculating the MD5 digest, using its own record of the password, and
comparing the computed digest with the received digest. If the comparison fails, the
segment is dropped without any response to the sender. The LSR ignores LDP Hellos
from any LSR of which a password has not been configured.
Select the LDP LSR ID mode used here. The LSR ID is used to identify the LSR in the
MPLS network and is the IPv4 address of an interface. The recommended interface for
the LSR ID is the loopback interface. If the LSR ID is set to Auto, this decision will be
based on the following rule. If a loopback interface is configured, the LSR ID is set to the
IP address of the loopback interface. If multiple loopback interfaces are configured, the
loopback with the highest IP address will be used. If no loopback interface is configured,
the LSR ID is set to the highest IP address of the physical interfaces. Select and enter IP
Interface to specify whose IP Interface is used as the LSR ID.
Select the LDP Penultimate Hop Popping (PHP) behavior used here. If the LSR is set as
egress and the PHP is configured to Implicit NULL, it will distribute an implicit NULL label
to the upstream (Penultimate Hop). The upstream will then do Penultimate Hop Popping.
If the label distributed to Penultimate Hop is set as Explicit NULL, the Penultimate Hop
won't pop it.
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