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MPW(4) Device Drivers Manual MPW(4)

mpw
MPLS Ethernet pseudowire

pseudo-device mpw

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).

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

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.

The mpw kernel interface first appeared in OpenBSD 5.8.

The mpw driver was written by Rafael Zalamena <rzalamena@openbsd.org>.
March 11, 2019 OpenBSD-current