Specifications

mpls ldp tcp pak-priority
MP-269
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
mpls ldp tcp pak-priority
To give high priority to Label Distribution Protocol (LDP) messages sent by a router locally using
Transmission Control Protocol (TCP) connections, use the mpls ldp tcp pak-priority command in
global configuration mode. To keep LDP messages at normal priority, use the no form of this command.
mpls ldp tcp pak-priority
no mpl
s ldp tcp pak-priority
Syntax Description This command has no arguments or keywords.
Defaults This command is disabled.
Command Modes Global configuration
Command History
Usage Guidelines This command allows you to set high priority for LDP messages sent by a router locally using TCP
co
nnections.
During heavy network traffic, LDP session keepalive messages can be dropped from the outgoing
in
terface output queue. As a result, keepalives can timeout causing LDP sessions to go down.
First, to avoid session loss due to keepalive timeouts, configure the quality of service (QoS) and
di
fferentiated services code point (DSCP) for packets with type of service (ToS) bits set to 6. This
configuration guarantees that packets with a ToS bit precedence value of 6 receive a specified percentage
of the bandwidth of the designated outgoing links. Second, if you still experience a problem, use the
mpls ldp tcp pak-priority command.
Note Previously established LDP sessions are not affected when you issue the mpls ldp tcp pak-priority or
the no mpls ldp tcp pak-priority command.
Examples The following example gives LDP session messages sent by a router high priority locally:
Router(config)# mpls ldp tcp pak-priority
Related Commands
Release Modification
12.3 This command was introduced.
Command Description
class-map Creates a class map to be used for matching packets to a specified class.
debug mpls ldp
t
ransport connections
Displays information about the TCP connections used to support LDP
sessions.