IP\-NEXTHOP
Section: Linux (8)
Updated: 30 May 2019
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NAME
ip-nexthop - nexthop object management
SYNOPSIS
ip
[ ip-OPTIONS ]
nexthop
{ COMMAND |
help }
ip nexthop {
show | flush }
SELECTOR
ip nexthop { add | replace } id
ID
NH
ip nexthop { get | del } id
ID
SELECTOR :=
[ id
ID ] [
dev
DEV ] [
vrf
NAME ] [
master
DEV ] [
groups ] [
fdb ]
NH := {
blackhole | [
via
ADDRESS ] [
dev
DEV ] [
onlink ] [
encap
ENCAP ] [
fdb ] |
group
GROUP [
fdb ] }
ENCAP := [
ENCAP_MPLS ]
ENCAP_MPLS :=
mpls [
LABEL ] [
ttl
TTL ]
GROUP :=
id[,weight[/...]
DESCRIPTION
ip nexthop
is used to manipulate entries in the kernel's nexthop tables.
- ip nexthop add id ID
-
add new nexthop entry
- ip nexthop replace id ID
-
change the configuration of a nexthop or add new one
-
- via [ FAMILY ] ADDRESS
-
the address of the nexthop router, in the address family FAMILY.
Address family must match address family of nexthop instance.
- dev NAME
-
is the output device.
- onlink
-
pretend that the nexthop is directly attached to this link,
even if it does not match any interface prefix.
- encap ENCAPTYPE ENCAPHDR
-
attach tunnel encapsulation attributes to this route.
ENCAPTYPE
is a string specifying the supported encapsulation type. Namely:
mpls
- encapsulation type MPLS
ENCAPHDR
is a set of encapsulation attributes specific to the
ENCAPTYPE.
mpls
MPLSLABEL
- mpls label stack with labels separated by
/
ttl
TTL
- TTL to use for MPLS header or 0 to inherit from IP header
- group GROUP
-
create a nexthop group. Group specification is id with an optional
weight (id,weight) and a '/' as a separator between entries.
- blackhole
-
create a blackhole nexthop
- fdb
-
nexthop and nexthop groups for use with layer-2 fdb entries.
A fdb nexthop group can only have fdb nexthops.
Example: Used to represent a vxlan remote vtep ip. layer-2 vxlan
fdb entry pointing to an ecmp nexthop group containing multiple
remote vtep ips.
- ip nexthop delete id ID
-
delete nexthop with given id.
- ip nexthop show
-
show the contents of the nexthop table or the nexthops
selected by some criteria.
-
- dev DEV
-
show the nexthops using the given device.
- vrf NAME
-
show the nexthops using devices associated with the vrf name
- master DEV
-
show the nexthops using devices enslaved to given master device
- groups
-
show only nexthop groups
- fdb
-
show only fdb nexthops and nexthop groups
- ip nexthop flush
-
flushes nexthops selected by some criteria. Criteria options are the same
as show.
- ip nexthop get id ID
-
get a single nexthop by id
EXAMPLES
ip nexthop ls
-
Show all nexthop entries in the kernel.
ip nexthop add id 1 via 192.168.1.1 dev eth0
-
Adds an IPv4 nexthop with id 1 using the gateway 192.168.1.1 out device eth0.
ip nexthop add id 2 encap mpls 200/300 via 10.1.1.1 dev eth0
-
Adds an IPv4 nexthop with mpls encapsulation attributes attached to it.
ip nexthop add id 3 group 1/2
-
Adds a nexthop with id 3. The nexthop is a group using nexthops with ids
1 and 2 at equal weight.
ip nexthop add id 4 group 1,5/2,11
-
Adds a nexthop with id 4. The nexthop is a group using nexthops with ids
1 and 2 with nexthop 1 at weight 5 and nexthop 2 at weight 11.
ip nexthop add id 5 via 192.168.1.2 fdb
-
Adds a fdb nexthop with id 5.
ip nexthop add id 7 group 5/6 fdb
-
Adds a fdb nexthop group with id 7. A fdb nexthop group can only have
fdb nexthops.
SEE ALSO
ip(8)
AUTHOR
Original Manpage by David Ahern <
dsahern@kernel.org>