Add BGP IPv6 unnumbered example

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diff --git a/docs/appendix/examples/bgp-ipv6-unnumbered.rst b/docs/appendix/examples/bgp-ipv6-unnumbered.rst
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+
+.. _examples-bgp-ipv6-unnumbered:
+
+VyOS BGP ipv6 unnumbered with extended nexthop
+----------------------------------------------
+
+General infomration can be found in the :ref:`Routing-BGP` chapter.
+
+Configuration
+^^^^^^^^^^^^^
+
+- Router A:
+.. code-block:: sh
+set protocols bgp 65020 address-family ipv4-unicast redistribute connected
+set protocols bgp 65020 address-family ipv6-unicast redistribute connected
+set protocols bgp 65020 neighbor eth1 interface v6only
+set protocols bgp 65020 neighbor eth1 interface v6only peer-group 'fabric'
+set protocols bgp 65020 neighbor eth2 interface v6only
+set protocols bgp 65020 neighbor eth2 interface v6only peer-group 'fabric'
+set protocols bgp 65020 parameters bestpath as-path multipath-relax
+set protocols bgp 65020 parameters bestpath compare-routerid
+set protocols bgp 65020 parameters default no-ipv4-unicast
+set protocols bgp 65020 parameters router-id '192.168.0.1'
+set protocols bgp 65020 peer-group fabric address-family ipv4-unicast
+set protocols bgp 65020 peer-group fabric address-family ipv6-unicast
+set protocols bgp 65020 peer-group fabric capability extended-nexthop
+set protocols bgp 65020 peer-group fabric remote-as 'external'
+
+-Router B:
+.. code-block:: sh
+set protocols bgp 65021 address-family ipv4-unicast redistribute connected
+set protocols bgp 65021 address-family ipv6-unicast redistribute connected
+set protocols bgp 65021 neighbor eth1 interface v6only
+set protocols bgp 65021 neighbor eth1 interface v6only peer-group 'fabric'
+set protocols bgp 65021 neighbor eth2 interface v6only
+set protocols bgp 65021 neighbor eth2 interface v6only peer-group 'fabric'
+set protocols bgp 65021 parameters bestpath as-path multipath-relax
+set protocols bgp 65021 parameters bestpath compare-routerid
+set protocols bgp 65021 parameters default no-ipv4-unicast
+set protocols bgp 65021 parameters router-id '192.168.0.2'
+set protocols bgp 65021 peer-group fabric address-family ipv4-unicast
+set protocols bgp 65021 peer-group fabric address-family ipv6-unicast
+set protocols bgp 65021 peer-group fabric capability extended-nexthop
+set protocols bgp 65021 peer-group fabric remote-as 'external'
+
+Results
+^^^^^^^^^^^^^
+
+- Router A:
+.. code-block:: sh
+vyos@vyos:~$ show interfaces 
+Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
+Interface        IP Address                        S/L  Description
+---------        ----------                        ---  -----------
+eth0             62.104.XXX.XXX/24                  u/u  
+eth1             -                                 u/u  
+eth2             -                                 u/u  
+lo               127.0.0.1/8                       u/u  
+                 192.168.0.1/32
+                 ::1/128
+vyos@vyos:~$ show ip route
+Codes: K - kernel route, C - connected, S - static, R - RIP,
+       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
+       T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
+       F - PBR, f - OpenFabric,
+       > - selected route, * - FIB route
+
+S>* 0.0.0.0/0 [210/0] via 62.104.XXX.XXX, eth0, 03:21:53
+C>* 62.104.56.0/24 is directly connected, eth0, 03:21:53
+C>* 192.168.0.1/32 is directly connected, lo, 03:21:56
+B>* 192.168.0.2/32 [20/0] via fe80::a00:27ff:fe3b:7ed2, eth2, 00:05:07
+  *                       via fe80::a00:27ff:fe7b:4000, eth1, 00:05:07
+vyos@vyos:~$ ping 192.168.0.2
+PING 192.168.0.2 (192.168.0.2) 56(84) bytes of data.
+64 bytes from 192.168.0.2: icmp_seq=1 ttl=64 time=0.575 ms
+64 bytes from 192.168.0.2: icmp_seq=2 ttl=64 time=0.628 ms
+64 bytes from 192.168.0.2: icmp_seq=3 ttl=64 time=0.581 ms
+64 bytes from 192.168.0.2: icmp_seq=4 ttl=64 time=0.682 ms
+64 bytes from 192.168.0.2: icmp_seq=5 ttl=64 time=0.597 ms
+^C
+--- 192.168.0.2 ping statistics ---
+5 packets transmitted, 5 received, 0% packet loss, time 4086ms
+rtt min/avg/max/mdev = 0.575/0.612/0.682/0.047 ms
+vyos@vyos:~$ show ip bgp summary 
+
+IPv4 Unicast Summary:
+BGP router identifier 192.168.0.1, local AS number 65020 vrf-id 0
+BGP table version 4
+RIB entries 5, using 800 bytes of memory
+Peers 2, using 41 KiB of memory
+Peer groups 1, using 64 bytes of memory
+
+Neighbor        V         AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down State/PfxRcd
+eth1            4      65021      13      13        0    0    0 00:05:33            2
+eth2            4      65021      13      14        0    0    0 00:05:29            2
+
+Total number of neighbors 2
+
+- Router B:
+.. code-block:: sh
+vyos@vyos:~$ show interfaces 
+Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
+Interface        IP Address                        S/L  Description
+---------        ----------                        ---  -----------
+eth0             62.104.XXX.XXX/24                  u/u  
+eth1             -                                 u/u  
+eth2             -                                 u/u  
+lo               127.0.0.1/8                       u/u  
+                 192.168.0.2/32
+                 ::1/128
+vyos@vyos:~$ show ip route
+Codes: K - kernel route, C - connected, S - static, R - RIP,
+       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
+       T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
+       F - PBR, f - OpenFabric,
+       > - selected route, * - FIB route
+
+S>* 0.0.0.0/0 [210/0] via 62.104.XXX.XXX, eth0, 00:44:08
+C>* 62.104.56.0/24 is directly connected, eth0, 00:44:09
+B>* 192.168.0.1/32 [20/0] via fe80::a00:27ff:fe2d:205d, eth1, 00:06:18
+  *                       via fe80::a00:27ff:fe93:e142, eth2, 00:06:18
+C>* 192.168.0.2/32 is directly connected, lo, 00:44:11
+vyos@vyos:~$ ping 192.168.0.1
+PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
+64 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=0.427 ms
+64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=0.471 ms
+64 bytes from 192.168.0.1: icmp_seq=3 ttl=64 time=0.782 ms
+64 bytes from 192.168.0.1: icmp_seq=4 ttl=64 time=0.715 ms
+^C
+--- 192.168.0.1 ping statistics ---
+4 packets transmitted, 4 received, 0% packet loss, time 3051ms
+rtt min/avg/max/mdev = 0.427/0.598/0.782/0.155 ms
+vyos@vyos:~$ show ip bgp summary 
+
+IPv4 Unicast Summary:
+BGP router identifier 192.168.0.2, local AS number 65021 vrf-id 0
+BGP table version 4
+RIB entries 5, using 800 bytes of memory
+Peers 2, using 41 KiB of memory
+Peer groups 1, using 64 bytes of memory
+
+Neighbor        V         AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down State/PfxRcd
+eth1            4      65020      14      14        0    0    0 00:06:40            2
+eth2            4      65020      14      14        0    0    0 00:06:37            2
+
+Total number of neighbors 2
+
diff --git a/docs/appendix/examples/index.rst b/docs/appendix/examples/index.rst
index c6e10eeb..3ea5cea7 100644
--- a/docs/appendix/examples/index.rst
+++ b/docs/appendix/examples/index.rst
@@ -11,3 +11,4 @@ This chapter contains various configuration Examples
 
    dmvpn
    zone-policy
+   bgp-ipv6-unnumbered