For a configured peer identified only by interface (bgpPeerLocalAddr and bgpPeerRemoteAddr are both zero), this is the interface index of the local point-to-point interface through which the peer is reachable. For a peer identified by a link-local IPv6 addresses, this is the scope ID of bgpPeerLocalAddr and bgpPeerRemoteAddr. For configured peers this field has the same value as bgpPeerLocalAddrScopeId for the corresponding row in the BGP peer configuration table (bgpPeerTable). For dynamic peers this field is the scope ID of the remote address as determined from the incoming connection.