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reduces code duplication and chance for error.
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by default txprio is set to 0, so the exp field will be 0. howerver,
txprio on mpe/mpw/mpip can be configured with other values or
settings like our other tunnel or encapsulation interfaces.
intermediate LSPs can use the exp field to manage their prioritisation
of encapsulated traffic.
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if these remain set then output on the underlying interface may
mistakenly be done with the wrong protocol type (eg, MPLS_MCAST
instead of MPLS), and to the wrong link layer address.
reported by Lee Nelson
the specific problem was identified by Mitchell Krome
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consistently set the rtabled for "outgoing" packets to the encap
rdomain. use this for rtallocs in mpip too instead of assuming 0.
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this makes ifconfig print "(unset)" to show the label isn't set yet.
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This is basically mpw(4), but it carries IP directly instead of
Ethernet. On the wire it can look the same as what IP over MPLS
looks like, but because it is a pseudowire you can configure a
control word or the FAT label to improve load balancing. It can
be used to quickly set up an IP tunnel over an MPLS fabric
without the need to configure bgpd and mpe(4) interfaces.
Because It implements the same pwe3 ioctls that mpw(4) uses ifconfig
already supports configuration of mpip(4) interfaces. ldpd will
grow support for this in the near future.
This is not hooked up to the build yet
discussed with claduio@ at ak219
ok claudio@
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dlg