ip link命令

NAME
ip-link - network device configuration

SYNOPSIS
ip [ OPTIONS ] link { COMMAND | help }

OPTIONS := { -V[ersion] | -s[tatistics] | -r[esolve] | -f[amily] { inet
| inet6 | ipx | dnet | link } | -o[neline] }

ip link add [ link DEVICE ] [ name ] NAME
[ txqueuelen PACKETS ]
[ address LLADDR ] [ broadcast LLADDR ]
[ mtu MTU ]
[ numtxqueues QUEUE_COUNT ] [ numrxqueues QUEUE_COUNT ]
type TYPE [ ARGS ]

TYPE := [ bridge | can | dummy | ifb | ipoib | macvlan | vcan | veth |
vlan | vxlan | ip6tnl | ipip | sit | gre | gretap | ip6gre |
ip6gretap ]

ip link delete DEVICE type TYPE [ ARGS ]

ip link set { DEVICE | group GROUP } { up | down | arp { on | off } |
promisc { on | off } |
allmulticast { on | off } |
dynamic { on | off } |
multicast { on | off } |
txqueuelen PACKETS |
name NEWNAME |
address LLADDR | broadcast LLADDR |
mtu MTU |
netns PID |
netns NETNSNAME |
alias NAME |
vf NUM [ mac LLADDR ] [ vlan VLANID [ qos VLAN-QOS ] ] [ rate
TXRATE ] [ spoofchk { on | off } ] |
master DEVICE
nomaster }

ip link show [ DEVICE | group GROUP ]

DESCRIPTION
ip link add - add virtual link
link DEVICE
specifies the physical device to act operate on.

NAME specifies the name of the new virtual device.

TYPE specifies the type of the new device.

Link types:

bridge - Ethernet Bridge device

can - Controller Area Network interface

dummy - Dummy network interface

ifb - Intermediate Functional Block device

ipoib - IP over Infiniband device

macvlan - Virtual interface base on link layer address
(MAC)

vcan - Virtual Local CAN interface

veth - Virtual ethernet interface

vlan - 802.1q tagged virtual LAN interface

vxlan - Virtual eXtended LAN

ip6tnl - Virtual tunnel interface IPv4|IPv6 over IPv6

ipip - Virtual tunnel interface IPv4 over IPv4

sit - Virtual tunnel interface IPv6 over IPv4

gre - Virtual tunnel interface GRE over IPv4

gretap - Virtual L2 tuunel interface GRE over IPv4

ip6gre - Virtual tuunel interface GRE over IPv6

ip6gretap - Virtual L2 tuunel interface GRE over IPv6

numtxqueues QUEUE_COUNT

specifies the number of transmit queues for new device.

numrxqueues QUEUE_COUNT
specifies the number of receive queues for new device.

VXLAN Type Support
For a link of type VXLAN the following additional arguments are
supported:

ip link add DEVICE type vxlan id ID [ dev PHYS_DEV ] [ { group
| remote } IPADDR ] [ local IPADDR ] [ ttl TTL ] [ tos TOS ] [
port MIN MAX ] [ [no]learning ] [ [no]proxy ] [ [no]rsc ] [
[no]l2miss ] [ [no]l3miss ]

id VNI - specifies the VXLAN Network Identifer (or VXLAN
Segment Identifier) to use.

dev PHYS_DEV - specifies the physical device to use for
tunnel endpoint communication.

group IPADDR - specifies the multicast IP address to
join. This parameter cannot be specified with the
remote parameter.

remote IPADDR - specifies the unicast destination IP
address to use in outgoing packets when the destination
link layer address is not known in the VXLAN device for-
warding database. This parameter cannot be specified
with the group parameter.

local IPADDR - specifies the source IP address to use in
outgoing packets.

ttl TTL - specifies the TTL value to use in outgoing
packets.

tos TOS - specifies the TOS value to use in outgoing
packets.

port MIN MAX - specifies the range of port numbers to
use as UDP source ports to communicate to the remote
VXLAN tunnel endpoint.

[no]learning - specifies if unknown source link layer
addresses and IP addresses are entered into the VXLAN
device forwarding database.

[no]rsc - specifies if route short circuit is turned on.

[no]proxy - specifies ARP proxy is turned on.

[no]l2miss - specifies if netlink LLADDR miss notifica-
tions are generated.

[no]l3miss - specifies if netlink IP ADDR miss notifica-
tions are generated.

IP6GRE/IP6GRETAP Type Support
For a link of type IP6GRE/IP6GRETAP the following additional
arguments are supported:

ip link add DEVICE type { ip6gre | ip6gretap } remote ADDR
local ADDR [ [i|o]seq] ] [ [i|o]key KEY ] [ [i|o]csum ] [
hoplimit TTL ] [ encaplimit ELIM ] [ tclass TCLASS ] [ flowlabel
FLOWLABEL ] [ dscp inherit ] [ dev PHYS_D

EV ]

remote ADDR - specifies the remote IPv6 address of the
tunnel.

local ADDR - specifies the fixed local IPv6 address for
tunneled packets. It must be and address on another
interface on this host.

[i|o]seq - serialize packets. The oseq flag enables
sequencing of outgoing packets. The iseq flag requires
that all input packets are serialized.

[i|o]key KEY - use keyed GRE with key KEY. KEY is either
a number or an IPv4 address-like dotted quad. The key
parameter specifies the same key to use in both direc-
tions. The ikey and okey parameters specify different
keys for input and output.

[i|o]csum - generate/require checksums for tunneled
packets. The ocsum flag calculates checksums for outgo-
ing packets. The icsum flag requires that all input
packets have the correct checksum. The csum flag is
equivalent to the combination icsum ocsum.

hoplimit TTL - specifies Hop Limit value to use in out-
going packets.

encaplimit ELIM - specifies a fixed encapsulation limit.
Default is 4.

flowlabel FLOWLABEL - specifies a fixed flowlabel.

tclass TCLASS - specifies the traffic class field on
tunneled packets, which can be specified as either a
two-digit hex value (e.g. c0) or a predefined string
(e.g. internet). The value inherit causes the field to
be copied from the original IP header. The values
inherit/STRING or inherit/00..ff will set the field to
STRING or 00..ff when tunneling non-IP packets. The
default value is 00.

ip link delete - delete virtual link
DEVICE specifies the virtual device to act operate on. TYPE specifies
the type of the device.

dev DEVICE
specifies the physical device to act operate on.

ip link set - change device attributes
dev DEVICE
DEVICE specifies network device to operate on. When configuring
SR-IOV Virtual Function (VF) devices, this keyword should spec-
ify the associated Physical Function (PF) device.

group GROUP
GROUP has a dual role: If both group and dev are present, then
move the device to the specified group. If only a group is
specified, then the command operates on all devices in that
group.

up and down

change the state of the device to UP or DOWN.

arp on or arp off
change the NOARP flag on the device.

multicast on or multicast off
change the MULTICAST flag on the device.

dynamic on or dynamic off
change the DYNAMIC flag on the device.

name NAME
change the name of the device. This operation is not recom-
mended if the device is running or has some addresses already
configured.

txqueuelen NUMBER

txqlen NUMBER
change the transmit queue length of the device.

mtu NUMBER
change the MTU of the device.

address LLADDRESS
change the station address of the interface.

broadcast LLADDRESS

brd LLADDRESS

peer LLADDRESS
change the link layer broadcast address or the peer address when
the interface is POINTOPOINT.

netns PID
move the device to the network namespace associated with the
process PID.

netns NETNSNAME
move the device to the network namespace associated with name
NETNSNAME.

alias NAME
give the device a symbolic name for easy reference.

group GROUP
specify the group the device belongs to. The available groups
are listed in file /etc/iproute2/group.

vf NUM specify a Virtual Function device to be configured. The associ-
ated PF device must be specified using the dev parameter.

mac LLADDRESS - change the station address for the spec-
ified VF. The vf parameter must be specified.

vlan VLANID - change the assigned VLAN for the specified
VF. When specified, all traffic sent from the VF will be
tagged with the specified VLAN ID. Incoming traffic will
be filtered for the specified VLAN ID, and will have all
VLAN tags stripped before being passed to the VF. Set-
ting this parameter to 0 disables VLAN tagging and fil-
tering. The vf parameter must be specified.

qos VLAN-QOS - assign VLAN QOS (priority) bits for the
VLAN tag. When specified, all VLAN tags transmitted by
the VF will include the specified priority bits in the
VLAN tag. If not specified, the value is assumed to be
0. Both the vf and vlan parameters must be specified.
Setting both vlan and qos as 0 disables VLAN tagging and
filtering for the VF.

rate TXRATE - change the allowed transmit bandwidth, in
Mbps, for the specified VF. Setting th

is parameter to 0
disables rate limiting. The vf parameter must be speci-
fied.

spoofchk on|off - turn packet spoof checking on or off
for the specified VF.

master DEVICE
set master device of the device (enslave device).

nomaster
unset master device of the device (release device).

Warning: If multiple parameter changes are requested, ip aborts immedi-
ately after any of the changes have failed. This is the only case when
ip can move the system to an unpredictable state. The solution is to
avoid changing several parameters with one ip link set call.

ip link show - display device attributes
dev NAME (default)
NAME specifies the network device to show. If this argument is
omitted all devices in the default group are listed.

group GROUP
GROUP specifies what group of devices to show.

up only display running interfaces.

EXAMPLES
ip link show
Shows the state of all network interfaces on the system.

ip link set dev ppp0 mtu 1400
Change the MTU the ppp0 device.

ip link add link eth0 name eth0.10 type vlan id 10
Creates a new vlan device eth0.10 on device eth0.

ip link delete dev eth0.10
Removes vlan device.