http://yang.eurecom.fr/yin#description
| - Configure VPN instances. VPN instances are established to separate VPN routes from public network routes, and separate the routes of different VPNs. Multiple software features can be bound to multiple VPN instances to form a multi-instance that provides multiple features, for example, RIP multi-instance, OSPF multi-instance, IS-IS multi-instance, and BGP multi-instance. The _public_, dcn, ason, __mpp_vpn_inner__, __mpp_vpn_outer__, __mpp_vpn_inner_server__, and __LOCAL_OAM_VPN__ instances cannot be deleted.
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