Impact of broadcast, multicast and unknown unicast at low speed DSL connections based at SHDSL

In this paper we discussed about impact of broadcast/multicast/unknown unicast at low speed DSL connections that are based on SHDSL. We showed that impact of broadcast and multicast is negligee in comparing with unknown unicast. In presented case the unknown unicast has made an impact with fatal consequence (total break or very slow access to internet) in network with 500 Low Speed DSL users. At the end, we discussed three possible scenarios for remove this impact: filtering of unknown unicast, changing VLAN per location and correcting settings of transport network and we showed two experimental resultants of removing of this impact in case of the filtering and dedicated one VLAN per each location. Therefore, we demonstrated that an impact of unknown unicast was total removed in both cases. In addition, we showed the fatal impact on links can be occurred when only 0,1 % of uplink is unavailable.