модуль управления mpls (mpls manipulation module)
Имя (Name)
mpls - mpls manipulation module
Синопсис (Synopsis)
tc ... action mpls { POP | PUSH | MODIFY | dec_ttl } [ CONTROL ]
POP := pop protocol MPLS_PROTO
PUSH := { push | mac_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 }
Описание (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.
Параметры (Options)
pop Decapsulation mode. Requires the protocol of the next
header.
push Encapsulation mode. Adds the MPLS header between the MAC
and the network headers. Requires at least the label
option.
mac_push
Encapsulation mode. Adds the MPLS header before the MAC
header. 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.
Примеры (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 redirected 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 eth1
Here is another example, where incoming Ethernet frames are
encapsulated into MPLS with label 123 and TTL 64. Then, an outer
Ethernet header is added and the resulting frame is finally sent
on eth1:
#tc qdisc add dev eth0 ingress
#tc filter add dev eth0 ingress matchall \
action mpls mac_push label 123 ttl 64 \
action vlan push_eth \
dst_mac 02:00:00:00:00:02 \
src_mac 02:00:00:00:00:01 \
action mirred egress redirect dev eth1
The following example assumes that incoming MPLS packets with
label 123 transport Ethernet frames. The outer Ethernet and the
MPLS headers are stripped, then the inner Ethernet frame is sent
on eth1:
#tc qdisc add dev eth0 ingress
#tc filter add dev eth0 ingress protocol mpls_uc \
flower mpls_label 123 mpls_bos 1 \
action vlan pop_eth \
action mpls pop protocol teb \
action mirred egress redirect dev eth1
Смотри также (See also)
tc(8), tc-mirred(8), tc-vlan(8)
