Added config example of vpn ipsec site-to-site

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+.. _examples-site-2-site-cisco:
+
+Site-to-Site IPSec VPN to Cisco using FlexVPN
+---------------------------------------------
+
+This guide shows a sample configuration for FlexVPN site-to-site Internet 
+Protocol Security (IPsec)/Generic Routing Encapsulation (GRE) tunnel.
+
+FlexVPN is a newer "solution" for deployment of VPNs and it utilizes IKEv2 as 
+the key exchange protocol. The result is a flexible and scalable VPN solution 
+that can be easily adapted to fit various network needs. It can also support a 
+variety of encryption methods, including AES and 3DES.
+
+The lab was built using EVE-NG.
+
+
+Configuration
+^^^^^^^^^^^^^^
+
+VyOS
+=====
+
+- GRE:
+
+.. code-block:: none
+
+  set interfaces tunnel tun1 encapsulation 'gre'
+  set interfaces tunnel tun1 ip adjust-mss '1336'
+  set interfaces tunnel tun1 mtu '1376'
+  set interfaces tunnel tun1 remote '10.1.1.6'
+  set interfaces tunnel tun1 source-address '88.2.2.1'
+
+
+- IPsec:
+
+.. code-block:: none
+
+  set vpn ipsec authentication psk vyos_cisco_l id 'vyos.net’
+  set vpn ipsec authentication psk vyos_cisco_l id 'cisco.hub.net'
+  set vpn ipsec authentication psk vyos_cisco_l secret 'secret'
+  set vpn ipsec esp-group e1 lifetime '3600'
+  set vpn ipsec esp-group e1 mode 'tunnel'
+  set vpn ipsec esp-group e1 pfs 'disable'
+  set vpn ipsec esp-group e1 proposal 1 encryption 'aes128'
+  set vpn ipsec esp-group e1 proposal 1 hash 'sha256'
+  set vpn ipsec ike-group i1 key-exchange 'ikev2'
+  set vpn ipsec ike-group i1 lifetime '28800'
+  set vpn ipsec ike-group i1 proposal 1 dh-group '5'
+  set vpn ipsec ike-group i1 proposal 1 encryption 'aes256'
+  set vpn ipsec ike-group i1 proposal 1 hash 'sha256'
+  set vpn ipsec interface 'eth2'
+  set vpn ipsec options disable-route-autoinstall
+  set vpn ipsec options flexvpn
+  set vpn ipsec options interface 'tun1'
+  set vpn ipsec options virtual-ip
+  set vpn ipsec site-to-site peer cisco_hub authentication local-id 'vyos.net'
+  set vpn ipsec site-to-site peer cisco_hub authentication mode 'pre-shared-secret'
+  set vpn ipsec site-to-site peer cisco_hub authentication remote-id 'cisco.hub.net'
+  set vpn ipsec site-to-site peer cisco_hub connection-type 'initiate'
+  set vpn ipsec site-to-site peer cisco_hub default-esp-group 'e1'
+  set vpn ipsec site-to-site peer cisco_hub ike-group 'i1'
+  set vpn ipsec site-to-site peer cisco_hub local-address '88.2.2.1'
+  set vpn ipsec site-to-site peer cisco_hub remote-address '10.1.1.6'
+  set vpn ipsec site-to-site peer cisco_hub tunnel 1 local prefix '88.2.2.1/32'
+  set vpn ipsec site-to-site peer cisco_hub tunnel 1 protocol 'gre'
+  set vpn ipsec site-to-site peer cisco_hub tunnel 1 remote prefix '10.1.1.6/32'
+  set vpn ipsec site-to-site peer cisco_hub virtual-address '0.0.0.0'
+
+
+Cisco
+=====
+.. code-block:: none
+
+  aaa new-model
+  !
+  !
+  aaa authorization network default local
+  !
+  crypto ikev2 name-mangler GET_DOMAIN
+   fqdn all
+   email all
+  !
+  !
+  crypto ikev2 authorization policy vyos
+   pool mypool
+   aaa attribute list mylist
+   route set interface
+   route accept any tag 100 distance 5
+  !
+  crypto ikev2 keyring mykeys
+   peer peer1
+    identity fqdn vyos.net
+    pre-shared-key local secret
+    pre-shared-key remote secret
+  crypto ikev2 profile my_profile
+   match identity remote fqdn vyos.net
+   identity local fqdn cisco.hub.net
+   authentication remote pre-share
+   authentication local pre-share
+   keyring local mykeys
+   dpd 10 3 periodic
+   aaa authorization group psk list local name-mangler GET_DOMAIN
+   aaa authorization user psk cached
+   virtual-template 1
+  !
+  !
+  !
+  crypto ipsec transform-set TSET esp-aes esp-sha256-hmac
+   mode tunnel
+  !
+  !
+  crypto ipsec profile my-ipsec-profile
+   set transform-set TSET
+   set ikev2-profile my_profile
+  !
+  interface Virtual-Template1 type tunnel
+   no ip address
+   ip mtu 1376
+   ip nhrp network-id 1
+   ip nhrp shortcut virtual-template 1
+   ip tcp adjust-mss 1336
+   tunnel path-mtu-discovery
+   tunnel protection ipsec profile my-ipsec-profile
+   !
+   ip local pool my_pool 172.16.122.1 172.16.122.254
+
+
+Since the tunnel is a point-to-point GRE tunnel, it behaves like any other 
+point-to-point interface (for example: serial, dialer), and it is possible to 
+run any Interior Gateway Protocol (IGP)/Exterior Gateway Protocol (EGP) over 
+the link in order to exchange routing information
+
+Verification
+^^^^^^^^^^^^
+
+.. code-block:: none
+
+  vyos@vyos$ show interfaces
+  Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
+  Interface        IP Address                        S/L  Description
+  ---------        ----------                        ---  -----------
+  eth0             -                                 u/u
+  eth1             -                                 u/u
+  eth2             88.2.2.1/24                       u/u
+  eth3             172.16.1.2/24                     u/u
+  lo               127.0.0.1/8                       u/u
+                   ::1/128
+  tun1             172.16.122.2/32                   u/u
+
+  vyos@vyos:~$ show vpn ipsec sa
+  Connection          State    Uptime    Bytes In/Out    Packets In/Out    Remote address    Remote ID              Proposal
+  ------------------  -------  --------  --------------  ----------------  ----------------  ---------------------  -----------------------------
+  cisco_hub-tunnel-1  up       44m17s    35K/31K         382/367           10.1.1.6          cisco.hub.net  AES_CBC_128/HMAC_SHA2_256_128
+
+
+  Hub#sh crypto ikev2 sa detailed
+   IPv4 Crypto IKEv2  SA
+
+  Tunnel-id Local                 Remote                fvrf/ivrf            Status
+  5         10.1.1.6/4500         88.2.2.1/4500         none/none               READY
+        Encr: AES-CBC, keysize: 256, PRF: SHA256, Hash: SHA256, DH Grp:5, Auth sign: PSK, Auth verify: PSK
+        Life/Active Time: 86400/2694 sec
+        CE id: 0, Session-id: 2
+        Status Description: Negotiation done
+        Local spi: C94EE2DC92A60C47       Remote spi: 9AF0EF151BECF14C
+        Local id: cisco.hub.net
+        Remote id: vyos.net
+        Local req msg id:  269            Remote req msg id:  0
+        Local next msg id: 269            Remote next msg id: 0
+        Local req queued:  269            Remote req queued:  0
+        Local window:      5              Remote window:      1
+        DPD configured for 10 seconds, retry 3
+        Fragmentation not configured.
+        Extended Authentication not configured.
+        NAT-T is not detected
+        Cisco Trust Security SGT is disabled
+        Assigned host addr: 172.16.122.2