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# IPv6
## System configuration commands
```{cfgcmd} set system ipv6 disable-forwarding
Use this command to disable IPv6 forwarding on all interfaces.
```
```{cfgcmd} 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).
```
```{cfgcmd} set system ipv6 strict-dad
Use this command to disable IPv6 operation on interface when
Duplicate Address Detection fails on Link-Local address.
```
```{cfgcmd} 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 Maps 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.
```{cfgcmd} 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, isis, ospfv3, ripng, static
:::{note}
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 want to e.g. allow BGP to peer across the default route.
```{cfgcmd} 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
```{opcmd} show ipv6 neighbors
Use this command to show IPv6 Neighbor Discovery Protocol information.
```
```{opcmd} show ipv6 groups
Use this command to show IPv6 multicast group membership.
```
```{opcmd} show ipv6 forwarding
Use this command to show IPv6 forwarding status.
```
```{opcmd} show ipv6 route
Use this command to show IPv6 routes.
Check the many parameters available for the show ipv6 route command:
:::{code-block} none
vyos@vyos:~$ show ipv6 route
Possible completions:
<Enter> Execute the current command
<X:X::X:X> Show IPv6 routes of given address or prefix
<X:X::X:X/M>
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
:::
```
```{opcmd} show ipv6 prefix-list
Use this command to show all IPv6 prefix lists
There are different parameters for getting prefix-list information:
:::{code-block} none
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
:::
```
```{opcmd} show ipv6 access-list
Use this command to show all IPv6 access lists
You can also specify which IPv6 access-list should be shown:
:::{code-block} none
vyos@vyos:~$ show ipv6 access-list
Possible completions:
<Enter> Execute the current command
<text> Show specified IPv6 access-list
:::
```
```{opcmd} show ipv6 ospfv3
Use this command to get information about OSPFv3.
You can get more specific OSPFv3 information by using the parameters
shown below:
:::{code-block} none
vyos@vyos:~$ show ipv6 ospfv3
Possible completions:
<Enter> Execute the current command
area Show OSPFv3 spf-tree information
border-routers
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
:::
```
```{opcmd} show ipv6 ripng
Use this command to get information about the RIPNG protocol
```
```{opcmd} show ipv6 ripng status
Use this command to show the status of the RIPNG protocol
```
### Reset commands
```{opcmd} reset bgp ipv6 \<address\>
Use this command to clear Border Gateway Protocol statistics or
status.
```
```{opcmd} reset ipv6 neighbors \<address | interface\>
Use this command to reset IPv6 Neighbor Discovery Protocol cache for
an address or interface.
```
```{opcmd} 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.
```
|
