Index for tBgpPeerNgTable. tBgpPeerNgAddress indicates
the IPv(4/6) address of the Peer.
If tBgpPeerNgAddressType is 'ipv4', then tBgpPeerNgAddress object
expects an ipv4 address.
If tBgpPeerNgAddressType is 'ipv6', then tBgpPeerNgAddress object
should be a 16-octet value ipv6 address.