ip-nexthop(8) — Linux manual page


IP-NEXTHOP(8)                     Linux                    IP-NEXTHOP(8)

NAME         top

       ip-nexthop - nexthop object management

SYNOPSIS         top

       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         top

       ip nexthop is used to manipulate entries in the kernel's nexthop

       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

              encap ENCAPTYPE ENCAPHDR
                     attach tunnel encapsulation attributes to this

                     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.

                               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.

                     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         top

       ip nexthop ls
           Show all nexthop entries in the kernel.

       ip nexthop add id 1 via dev eth0
           Adds an IPv4 nexthop with id 1 using the gateway
           out device eth0.

       ip nexthop add id 2 encap mpls 200/300 via 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 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         top


AUTHOR         top

       Original Manpage by David Ahern <dsahern@kernel.org>

COLOPHON         top

       This page is part of the iproute2 (utilities for controlling
       TCP/IP networking and traffic) project.  Information about the
       project can be found at 
       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
       2021-04-01.  (At that time, the date of the most recent commit
       that was found in the repository was 2021-03-22.)  If you
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       manual page), send a mail to man-pages@man7.org

iproute2                       30 May 2019                 IP-NEXTHOP(8)