======  Example of Soft-Router (FRR) configuration for BNG L2-Connected ======
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The Soft-Router feature is used to announce NAT Pool subnets and authorized subscriber IP addresses for BNG L2-connected using dynamic routing protocols (BGP, OSPF, IS-IS). The principle of operation and configuration is described in the [[en:dpi:dpi_components:router|Soft-Router]] section.

==== Use case description: ====
The SSG (2x10G in port, 2x10G out port) is implemented in-line of 2x10G links, which are aggregated in LAG. The SSG is configured in BRAS L2 PPPoE mode, NAT Pool 100.0.0.0/24 is created.
{{ dpi:qoe:use_cases:brasl2softrouter:router_scenario.png?nolink&600 |}}

In this scenario we will assume that the docking network is 192.168.123.64/30, the IP on the SSG side is 192.168.123.65, the IP on the upstream router side is 192.168.123.66, ASN are 65501 and 65502 respectively.
Let's configure FRR as a router with a CLI most similar to the usual and familiar to cisco-like operators.
The out-interface of the SSG, in this case 13-00.0, is specified as the interface from which traffic will be diverted.

=== SSG (FastDPI) configuration: ===

/etc/dpi/fastdpi.conf:

  router=1
  router_kernel_table=254
  router_subs_announce=6
  router_netns=router
  router_device {
  
  device=13-00.0
  tap=dpi
  peer=rib
  subnet=192.168.123.65/30
  subnet=224.0.0.5/32
  subnet=224.0.0.6/32
  }  



=== Netns configuration: ===

  ip netns add router
  ip link add dpi type veth peer name rib netns router
  ip netns exec router ip address add 192.168.123.65/30 dev rib
  ip netns exec router ip link set dev rib arp on
  ip netns exec router ethtool -K rib tx off
  ip link set dev dpi arp off
  echo 1>/proc/sys/net/ipv6/conf/dpi/disable_ipv6
  ip link set dpi up
  ip netns exec router ip link set lo up
  ip netns exec router ip link set rib up
  firewall-cmd --zone=internal --add-source=192.168.123.65/24
  firewall-cmd --zone=internal --add-rich-rule='rule family=ipv4 source address=192.168.123.65/24 accept

We recommend adding these commands to the script and then adding the script to autorun.

=== FRR daemons setup: ==
/etc/frr/daemons:

<code>bgpd=yes
ospfd=yes
ospf6d=yes
ripd=no
ripngd=no
isisd=no
pimd=no
nhrpd=no
eigrpd=no
sharpd=no
pbrd=no
bfdd=no
fabricd=no
vrrpd=no

vtysh_enable=yes
zebra_options="  -A 127.0.0.1 -s 90000000 --vrfwnetns"
bgpd_options="   -A 127.0.0.1"
ospfd_options="  -A 127.0.0.1"
ospf6d_options=" -A ::1"
ripd_options="   -A 127.0.0.1"
ripngd_options=" -A ::1"
isisd_options="  -A 127.0.0.1"
pimd_options="   -A 127.0.0.1"
nhrpd_options="  -A 127.0.0.1"
eigrpd_options=" -A 127.0.0.1"
sharpd_options=" -A 127.0.0.1"
pbrd_options="   -A 127.0.0.1"
staticd_options="-A 127.0.0.1"
bfdd_options="   -A 127.0.0.1"
fabricd_options="-A 127.0.0.1"
vrrpd_options="  -A 127.0.0.1"
</code>


=== FRR (OSPF) setup: ===

/etc/frr/frr.conf:

  frr version 7.5
  frr defaults traditional
  hostname bras-demo-01
  no ip forwarding
  no ipv6 forwarding
  no service integrated-vtysh-config
  !
  vrf router
   netns /run/netns/router
   exit-vrf
  !
  router ospf vrf router
   network 192.168.123.0/24 area 0
  !
  line vty
  !

=== FRR (BGP) setup: ===

/etc/frr/frr.conf 

  frr version 7.5
  frr defaults traditional
  hostname bras-demo-01
  log file /var/log/frr/debug.log
  log syslog
  no ip forwarding
  no ipv6 forwarding
  service integrated-vtysh-config
  !
  router bgp 65501 vrf router
   bgp router-id 192.168.123.65
   neighbor 192.168.123.66 remote-as 65502
   !
   address-family ipv4 unicast
    redistribute kernel
    neighbor 192.168.123.66 route-map PERMIT_ALL in
    neighbor 192.168.123.66 route-map PERMIT_ALL out
    neighbor 192.168.123.66 soft-reconfiguration inbound
   exit address-family
  !
  route-map PERMIT_ALL permit 10
  !
  line vty
  !