NAME

       mpls - mpls manipulation module

SYNOPSIS

       tc ... action mpls { POP | PUSH | MODIFY | dec_ttl } [ CONTROL ]

       POP := pop protocol MPLS_PROTO

       PUSH := push [ protocol MPLS_PROTO ]  [ tc MPLS_TC ]  [ ttl MPLS_TTL ]  [ bos MPLS_BOS ] label MPLS_LABEL

       MODIFY := modify [ label MPLS_LABEL ]  [ tc MPLS_TC ]  [ ttl MPLS_TTL ]

       CONTROL := { reclassify | pipe | drop | continue | pass | goto chain CHAIN_INDEX }

DESCRIPTION

       The  mpls  action  performs  mpls  encapsulation or decapsulation on a packet, reflected by the operation
       modes POP, PUSH, MODIFY and DEC_TTL.  The POP mode requires the ethertype of the header that follows  the
       MPLS  header (e.g.  IPv4 or another MPLS). It will remove the outer MPLS header and replace the ethertype
       in the MAC header with that passed. The PUSH and MODIFY modes update the current MPLS header  information
       or  add  a  new  header.  PUSH requires at least an MPLS_LABEL.  DEC_TTL requires no arguments and simply
       subtracts 1 from the MPLS header TTL field.

OPTIONS

       pop    Decapsulation mode. Requires the protocol of the next header.

       push   Encapsulation mode. Requires at least the label option.

       modify Replace mode. Existing MPLS tag is replaced.  label, tc, and ttl are all optional.

       dec_ttl
              Decrement the TTL field on the outer most MPLS header.

       label MPLS_LABEL
              Specify the MPLS LABEL for the outer MPLS header.  MPLS_LABEL is an unsigned  20bit  integer,  the
              format is detected automatically (e.g. prefix with '0x' for hexadecimal interpretation, etc.).

       protocol MPLS_PROTO
              Choose  the  protocol  to  use.  For  push actions this must be mpls_uc or mpls_mc (mpls_uc is the
              default). For pop actions it should be the protocol of the next header.   This  option  cannot  be
              used with modify.

       tc MPLS_TC
              Choose the TC value for the outer MPLS header. Decimal number in range of 0-7.  Defaults to 0.

       ttl MPLS_TTL
              Choose the TTL value for the outer MPLS header. Number in range of 0-255. A non-zero default value
              will be selected if this is not explicitly set.

       bos MPLS_BOS
              Manually  configure  the  bottom  of  stack  bit for an MPLS header push. The default is for TC to
              automatically set (or unset) the bit based on the next header of the packet.

       CONTROL
              How to continue after executing this action.

              reclassify
                     Restarts classification by jumping back to the  first  filter  attached  to  this  action's
                     parent.

              pipe   Continue with the next action, this is the default.

              drop   Packet will be dropped without running further actions.

              continue
                     Continue classification with next filter in line.

              pass   Return to calling qdisc for packet processing. This ends the classification process.

EXAMPLES

       The  following example encapsulates incoming IP packets on eth0 into MPLS with a label 123 and sends them
       out eth1:

              #tc qdisc add dev eth0 handle ffff: ingress
              #tc filter add dev eth0 protocol ip parent ffff: flower \
                   action mpls push protocol mpls_uc label 123  \
                   action mirred egress redirect dev eth1

       In this example, incoming MPLS unicast packets on eth0 are decapsulated and to ip packets and  output  to
       eth1:

              #tc qdisc add dev eth0 handle ffff: ingress
              #tc filter add dev eth0 protocol mpls_uc parent ffff: flower \
                   action mpls pop protocol ipv4  \
                   action mirred egress redirect dev eth0

SEE ALSO

       tc(8)

iproute2                                           22 May 2019                 MPLS manipulation action in tc(8)