S-Access ETHERLINK IV Technical Description And Operations Manual
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DT Etherlink IV User Manual- 30 -Same MAC address VLAN1,VID=1PBVLAN AVLAN other,VID=100PBVLAN AVLAN other,VID=200PBVLAN AVLAN1,VID=1PBVLAN BVLAN other,VID=100PBVLAN BVLAN other,VID=200PBVLAN BVLAN1, VID=1PBVLAN AN/A OK OK NOKSame MAC onsame VLAN forVLAN=1..8OK OKVLAN other, VID=100PBVLAN AN/A NOKSame MAC onsame PBVLANfor VLAN≠1..8OK OK OKVLAN other, VID=200PBVLAN AN/A OK OK OKVLAN1,VID=1PBVLAN BN/A OK OKVLAN other, VID=100PBVLAN BN/A NOKSame MAC onsame PBVLANfor VLAN≠1..8VLAN other, VID=200PBVLAN BN/ATable 3.9 Same MAC address on different VLANs and PBVLANsIn addition, every unit has a table of static MAC addresses (up to 8 addresses) for connecteddevices, so that each device can have a VLAN number and a QoS priority level (this is a table ofspecial MAC addresses). If a packet is received from the Access port and the MAC address of thepacket sender is inside this table, a header with the necessary VLAN number and the QoS prioritywill be assigned to this packet before transmitting it to the Trunk port. Otherwise, a default VLANnumber and QoS priority will be assigned to the packet.A group of DSL ports (WAN1–WAN4) (SHDSL interface) means that Ethernet data can bemapped onto specified timeslots (64kbit/s) on the SHDSL interface by using the internal switch. Inthis case, this port always serves as a Trunk port. Any data received from Access/Mixed ports arefirst transformed into Ethernet packets with VLAN format and then transmitted over the SHDSLinterface.A group of E1 ports (WAN1–WAN4) (E1 interface) means that Ethernet data can be mapped ontospecified timeslots (64kbit/s) on the E1 interface by using the internal switch. In this case, this portalways serves as a Trunk port.A virtual management port (INT) (Virtual management port) is an internal device managementprogram. The IP-address of this device is the logical address of the management program. Forexample, to open a session for managing a remote device, the IP-address of this device should bespecified in the Telnet program. At the physical layer, the MAC address of the device is also themanagement program address, which is inside the Ethernet frame.Note: As a rule the data of the management port have the highest priority (example, QoS = 7).3.2.2.5 Rapid Spanning Tree ProtocolThe system supports Rapid Spanning Tree Protocol (RSTP) according to IEEE 801.1d 2004recommendation. All available Ethernet ports as well as all available WAN interfaces couldparticipate in RSTP construction. A WAN interface could be configured to carry Ethernet data overDSL line or over E1 interface. If several DSL links or E1 interfaces are combined into MULTIWAN,this MWAN will participate in RSTP construction too.The RSTP itself is a protocol used for dynamic link switching in networks with ring topology. The ringtopology improves reliability of data networks; nevertheless Ethernet networks must have only oneactive path between any of two nodes to prevent packet loop. Ethernet switches with enabled RSTP |
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