The VPN ID to advertise as a BGP extended community, or zero if none. If the VPLS uses BGP auto-discovery and LDP signaling (vplsConfigADType = bgp and vplsConfigSigType = ldp) then this must be set to a valid VPN ID, otherwise it is unused and can be set to zero. In order to be a valid VPN ID, the first two bytes must be either an AS-specific L2VPN identifier extended community (0x000A) or an IPv4-address-specific L2VPN identifier extended community (0x010A). If the VPLS uses BGP auto-discovery and LDP signaling then the VPN ID is used as follows. - The VPLS advertises the VPN ID as a BGP extended community attribute on all BGP L2VPN routes that it exports. - The VPLS uses the VPN ID as an import filter on all BGP L2VPN routes that it imports (in addition to Route Target import filtering). - The VPLS uses the VPN ID as the AGI value in LDP messages. Changing this value will cause an interruption to data flow for this VPLS.