VSD-domain type L2-DOMAIN

L2-DOMAIN VSD-domains are associated with VPLS services configured without a route-target and vxlan VNI. VSD configures the route-target and VNI in the router VPLS service. Some considerations related to L2-DOMAINs are:

ip-route-advertisement and allow-ip-int-bind commands are not allowed in this type of domain. An example of configuration for an L2-DOMAIN association is shown below:

*B:Dut>config>service# info
...
      vsd
            domain nuage_501 type l2-domain create
                description "nuage_501_l2_domain"
                no shutdown
            exit 
*B:Dut>config>service# vpls 501 
*B:Dut>config>service>vpls# info 
----------------------------------------------
            bgp
                route-distinguisher 192.0.2.2:52
                vsi-import ‟policy-1”
                vsi-export ‟policy-1”
            exit
            bgp-evpn
            exit
            sap 1/1/1:501 create
            exit
            spoke-sdp 10:501 create
                no shutdown
            exit
            vsd-domain "nuage_501"
            no shutdown
----------------------------------------------

The VSD pushes a dynamic vxlan vni and route-target that the router adds to the VPLS service. For the route-target, the system checks whether the VPLS service has a configured policy:
- If there is no vsi-import/export policy, the received dynamic route-target is added in the vpls>bgp context, and is used for all the BGP families in the service.
- If there is a vsi-import/export policy, the dynamic route-target is added to the policy, in an auto-created community that is shown with the following format: ‟_VSD_svc-id”. That community is added to dynamically created entries 1000 and 2000 in the first policy configured in the service vsi-import and vsi-export commands. This allows the user to allocate entries before entries 1000 and 2000 in case other modifications have to be made (user entries would have an action next-entry). An example of the auto-generated entries is shown below:
```
*A:PE# show router policy "policy-1" 
    entry 900 # manual entry
        from
          as-path ‟null"  
          family evpn
        exit
        action next-entry
          local-preference 500
        exit
    exit
    entry 1000 # automatic VSD-generated entry
        from
            community "_VSD_1"
            family evpn
        exit
        action accept
        exit
    exit
    entry 2000 # automatic VSD-generated entry
        from
            family evpn
        exit
        action accept
            community add "_VSD_1"
        exit
    exit
```