MPW(4) FreeBSD Kernel Interfaces Manual MPW(4)
NAME
mpw - MPLS Ethernet pseudowire
SYNOPSIS
pseudo-device mpw
DESCRIPTION
The mpw interface is used to create an MPLS Ethernet layer 2 tunnel
between two points.
An mpw interface can be created at runtime using the ifconfig mpwN create
command or by setting up a hostname.if(5) configuration file for
netstart(8). The interface itself can be configured with ifconfig(8).
The local MPLS label, the remote MPLS label and neighbor, use of
pseudowire control words, or flow-aware transport are normally configured
after negotiation with a remote system using ldpd(8), but it is also
possible to configure them manually using ifconfig(8).
EXAMPLES
Create a pseudowire with local label 20 and remote label 21 on neighbor
10.254.0.1:
# ifconfig mpw5 create
# ifconfig mpw5 mplslabel 20 pweneighbor 21 10.254.0.1
# ifconfig mpw5 up
Enable the use of the Pseudowire Emulation Edge-to-Edge (PWE3) Control
Word, and disable the use of a Flow label for Flow-Aware Transport of
Pseudowires:
# ifconfig mpw5 pwecw -pwefat
mpw interfaces may be used to build a Virtual Private LAN Service (VPLS)
with bridge(4). A VPLS is constructed with a full mesh of MPLS
pseudowire tunnels between all peers, but this introduces loops in the
topology. To prevent broadcast packets received from the VPLS being
forwarded to its peers, all the pseudowire interfaces can be configured
to enforce the split-horizon forwarding rule by adding them to the same
protected bridge domain. Different VPLS meshes can be joined together on
the same bridge using different identifiers for their protected domains:
# ifconfig mpw10 create up
# ifconfig mpw11 create up
# ifconfig mpw12 create up
# ifconfig bridge0 create
# ifconfig bridge0 add em2
# ifconfig bridge0 add mpw10 add mpw11 add mpw12
# ifconfig bridge0 protected mpw10 1
# ifconfig bridge0 protected mpw11 1
# ifconfig bridge0 protected mpw12 1
SEE ALSO
mpe(4), mpip(4), hostname.if(5), ifconfig(8), ldpd(8), netstart(8)
S. Bryant and P. Pate, Pseudo Wire Emulation Edge-to-Edge (PWE3)
Architecture, RFC 3985, March 2005.
S. Bryant, G. Swallow, and L. Martini, Pseudowire Emulation Edge-to-Edge
(PWE3) Control Word for Use over an MPLS PSN, RFC 4385, February 2005.
S. Bryant, C. Filsfils, U. Drafz, V. Kompella, J. Regan, and S. Amante,
Flow-Aware Transport of Pseudowires over an MPLS Packet Switched Network,
RFC 6391, November 2011.
HISTORY
The mpw kernel interface first appeared in OpenBSD 5.8.
AUTHORS
The mpw driver was written by Rafael Zalamena <
[email protected]>.
FreeBSD 14.1-RELEASE-p8 March 18, 2021 FreeBSD 14.1-RELEASE-p8