NAME
ldpd
—
Label Distribution Protocol
Daemon
SYNOPSIS
ldpd |
[-DdfhW ] [-c
config_file] [-p
port] |
DESCRIPTION
ldpd
is a utility used to automatically distribute
labels between two MPLS LSRs conforming to RFC5036. Currently some features
described by RFC5036 are not fully implemented (see
BUGS section). ldpd
supports peering with IPv6 LDP speakers and IPv6 labels exchange, conforming
to specifications in RFC5036 and draft-ietf-mpls-ldp-ipv6.
ldpd
logs information using the
syslog(3) interface. You can increase the log verbosity using the
-W
and -D
flags.
Administrators can use telnet(1) to connect to the control port (default: 2626) and use this interface in order to get informations about protocol status, neighbours et cetera but also to set runtime parameters. The password required for connecting is the same as the root password.
ldpd
computes existing routes and tries to
match them on MPLS labels announced by other LDP peers. This means that
usual IP routes will be changed into tagged routes, and MPLS routing table
will be populated. Any change in MPLS topology will also be announced to LDP
neighbors. ldpd
uses currently Independent Control
Mapping and Downstream Unsolicited mode for Label Advertisment.
ldpd
will listen on a route socket and compute the
necessary changes in order to change untagged routes into tagged routes.
This means that one may use one's favourite dynamic routing protocol daemon
without modifications.
The options are as follows:
-c
config_file- Specifies a path to the config file. Default: /etc/ldpd.conf - see ldpd.conf(5) for configuration file format.
-D
- Enable debug mode.
-d
- Don't use route interception code.
ldpd
will not make any changes to routing table if started with this option. -f
- Run in foreground. Use STDOUT for warning and debug messages.
-h
- Outputs supported flags.
-p
port- Changes the TCP control port (default: 2626).
-W
- Enable output of warning messages.
SEE ALSO
LDP Specification, RFC, 5036, October 2007.
LDP Applicability, RFC, 3037, January 2001.
Updates to LDP for IPv6, DRAFT, draft-ietf-mpls-ldp-ipv6-07, June 2012.
HISTORY
The ldpd
command appeared in
NetBSD 6.0.
BUGS
ldpd
doesn't implement Path Vector and Hop
Count TLVs.
SECURITY CONSIDERATIONS
As a security measure you SHOULD filter the LDP well-known (646)
TCP and UDP ports using your favourite packet filter before starting
ldpd
. This is the current way used to filter
neighbours and to protect the system from possible external attacks like
route injections.