System configuration commands

set system ipv6 disable-forwarding

Use this command to disable IPv6 forwarding on all interfaces.

set system ipv6 neighbor table-size <number>

Use this command to define the maximum number of entries to keep in the Neighbor cache (1024, 2048, 4096, 8192, 16384, 32768).

set system ipv6 strict-dad

Use this command to disable IPv6 operation on interface when Duplicate Address Detection fails on Link-Local address.

set system ipv6 multipath layer4-hashing

Use this command to user Layer 4 information for ECMP hashing.

Zebra/Kernel route filtering

Zebra supports prefix-lists and Route Mapss to match routes received from other FRR components. The permit/deny facilities provided by these commands can be used to filter which routes zebra will install in the kernel.

set system ipv6 protocol <protocol> route-map <route-map>

Apply a route-map filter to routes for the specified protocol. The following protocols can be used: any, babel, bgp, connected, isis, kernel, ospfv3, ripng, static, table


If you choose any as the option that will cause all protocols that are sending routes to zebra.

Nexthop Tracking

Nexthop tracking resolve nexthops via the default route by default. This is enabled by default for a traditional profile of FRR which we use. It and can be disabled if you do not wan’t to e.g. allow BGP to peer across the default route.

set system ipv6 nht no-resolve-via-default

Do not allow IPv6 nexthop tracking to resolve via the default route. This parameter is configured per-VRF, so the command is also available in the VRF subnode.

Operational commands

Show commands

show ipv6 neighbors

Use this command to show IPv6 Neighbor Discovery Protocol information.

show ipv6 groups

Use this command to show IPv6 multicast group membership.

show ipv6 forwarding

Use this command to show IPv6 forwarding status.

show ipv6 route

Use this command to show IPv6 routes.

Check the many parameters available for the show ipv6 route command:

vyos@vyos:~$ show ipv6 route
Possible completions:
  <Enter>       Execute the current command
  <X:X::X:X>    Show IPv6 routes of given address or prefix
  bgp           Show IPv6 BGP routes
  cache         Show kernel IPv6 route cache
  connected     Show IPv6 connected routes
  forward       Show kernel IPv6 route table
  isis          Show IPv6 ISIS routes
  kernel        Show IPv6 kernel routes
  ospfv3        Show IPv6 OSPF6 routes
  ripng         Show IPv6 RIPNG routes
  static        Show IPv6 static routes
  summary       Show IPv6 routes summary
  table         Show IP routes in policy table
  tag           Show only routes with tag
  vrf           Show IPv6 routes in VRF
show ipv6 prefix-list

Use this command to show all IPv6 prefix lists

There are different parameters for getting prefix-list information:

vyos@vyos:~$ show ipv6 prefix-list
Possible completions:
  <Enter>       Execute the current command
  <WORD>        Show specified IPv6 prefix-list
  detail        Show detail of IPv6 prefix-lists
  summary       Show summary of IPv6 prefix-lists
show ipv6 access-list

Use this command to show all IPv6 access lists

You can also specify which IPv6 access-list should be shown:

vyos@vyos:~$ show ipv6 access-list
Possible completions:
  <Enter>       Execute the current command
  <text>        Show specified IPv6 access-list
show ipv6 ospfv3

Use this command to get information about OSPFv3.

You can get more specific OSPFv3 information by using the parameters shown below:

vyos@vyos:~$ show ipv6 ospfv3
Possible completions:
  <Enter>       Execute the current command
  area          Show OSPFv3 spf-tree information
                Show OSPFv3 border-router (ABR and ASBR) information
  database      Show OSPFv3 Link state database information
  interface     Show OSPFv3 interface information
  linkstate     Show OSPFv3 linkstate routing information
  neighbor      Show OSPFv3 neighbor information
  redistribute  Show OSPFv3 redistribute External information
  route         Show OSPFv3 routing table information
show ipv6 ripng

Use this command to get information about the RIPNG protocol

show ipv6 ripng status

Use this command to show the status of the RIPNG protocol

Reset commands

reset bgp ipv6 <address>

Use this command to clear Border Gateway Protocol statistics or status.

reset ipv6 neighbors <address | interface>

Use this command to reset IPv6 Neighbor Discovery Protocol cache for an address or interface.

reset ipv6 route cache

Use this command to flush the kernel IPv6 route cache. An address can be added to flush it only for that route.