DT Etherlink IV
User Manual
- 30 -
Same MAC address
VLAN1,
VID=1
PBVLAN A
VLAN other,
VID=100
PBVLAN A
VLAN other,
VID=200
PBVLAN A
VLAN1,
VID=1
PBVLAN B
VLAN other,
VID=100
PBVLAN B
VLAN other,
VID=200
PBVLAN B
VLAN1, VID=1
PBVLAN A
N/A
OK
OK
NOK
Same MAC on
same VLAN for
VLAN=1..8
OK
OK
VLAN other, VID=100
PBVLAN A
N/A
NOK
Same MAC on
same PBVLAN
for VLAN≠1..8
OK
OK
OK
VLAN other, VID=200
PBVLAN A
N/A
OK
OK
OK
VLAN1,VID=1
PBVLAN B
N/A
OK
OK
VLAN other, VID=100
PBVLAN B
N/A
NOK
Same MAC on
same PBVLAN
for VLAN≠1..8
VLAN other, VID=200
PBVLAN B
N/A
Table 3.9
Same MAC address on different VLANs and PBVLANs
In addition, every unit has a table of static MAC addresses (up to 8 addresses) for connected
devices, so that each device can have a VLAN number and a QoS priority level (this is a table of
special MAC addresses). If a packet is received from the Access port and the MAC address of the
packet sender is inside this table, a header with the necessary VLAN number and the QoS priority
will be assigned to this packet before transmitting it to the Trunk port. Otherwise, a default VLAN
number and QoS priority will be assigned to the packet.
A group of DSL ports (WAN1
–WAN4)
(SHDSL interface) means that Ethernet data can be
mapped onto specified timeslots (64kbit/s) on the SHDSL interface by using the internal switch. In
this case, this port always serves as a
Trunk port
. Any data received from
Access/Mixed ports
are
first transformed into Ethernet packets with VLAN format and then transmitted over the SHDSL
interface.
A group of E1 ports (WAN1
–WAN4)
(E1 interface) means that Ethernet data can be mapped onto
specified timeslots (64kbit/s) on the E1 interface by using the internal switch. In this case, this port
always serves as a
Trunk port
.
A virtual management port (INT)
(Virtual management port) is an internal device management
program. The IP-address of this device is the logical address of the management program. For
example, to open a session for managing a remote device, the IP-address of this device should be
specified in the Telnet program. At the physical layer, the MAC address of the device is also the
management 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 Protocol
The system supports Rapid Spanning Tree Protocol (RSTP) according to IEEE 801.1d 2004
recommendation. All available Ethernet ports as well as all available WAN interfaces could
participate in RSTP construction. A WAN interface could be configured to carry Ethernet data over
DSL 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 ring
topology improves reliability of data networks; nevertheless Ethernet networks must have only one
active path between any of two nodes to prevent packet loop. Ethernet switches with enabled RSTP
