This read-write octet string holds the SMDS group address used as a broadcast mechanism for resolving an SMDS address from an IP address, functioning analogously to an ARP broadcast address but within the SMDS addressing scheme. An admin configures this to match the carrier or network-wide standard multicast group address used for this address-resolution purpose, since a wrong value would break IP-over-SMDS address resolution for devices relying on this port. For example, if lportSmdsMulticastGa does not match the group address the connected router expects for its SMDS ARP-equivalent broadcasts, that router would be unable to resolve peer IP addresses to SMDS addresses over this link.