The value of tBgpPGLocalAddress specifies
the address of the peer group local address.
If the tBgpPGLocalAddressType is set to ipv4, then
the local address is an ipv4 address, if the
tBgpPGLocalAddressType is set to ipv6, the local
address of the peer group is an ipv6 address.
If local address is not set, tBgpPGLocalAddressType is set to
unknown and tBgpPGLocalAddress returns a null string.