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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | SEE ALSO | COLOPHON |
MPLS manipulation action in tc(8) Linux MPLS manipulation action in tc(8)
mpls - mpls manipulation module
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 }
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.
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.
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 decapsu‐
lated 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
tc(8)
This page is part of the iproute2 (utilities for controlling TCP/IP
networking and traffic) project. Information about the project can
be found at
⟨http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2⟩.
If you have a bug report for this manual page, send it to
netdev@vger.kernel.org, shemminger@osdl.org. This page was obtained
from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
2020-08-13. (At that time, the date of the most recent commit that
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(which is not part of the original manual page), send a mail to
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iproute2 22 May 2019MPLS manipulation action in tc(8)