D-Link DES-3226SM Product Manual - Page 32

Link Aggregation, 1d/802.1w Compatibility, Static vs. LACP Link Aggregation

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Page 32 highlights

DES-3226S Layer 2 Fast Ethernet Switch User's Guide The edge port is a configurable designation used for a port that is directly connected to a segment where a loop cannot be created. An example would be a port connected directly to a single workstation. Ports that are designated as edge ports, transition to a forwarding state immediately without going through the listening and learning states. An edge port loses its status if it receives a BPDU packet, immediately becoming a normal spanning tree port. P2P Port A P2P port is also capable of rapid transition. P2P ports may be used to connect to other bridges. Under RSTP, all ports operating in full-duplex mode are considered to be P2P ports, unless manually overridden through configuration. 802.1d/802.1w Compatibility RSTP can interoperate with legacy equipment and is capable of automatically adjusting BPDU packets to 802.1d format when necessary. However, any segment using 802.1 STP will not benefit from the rapid transition and rapid topology change detection of RSTP. The protocol also provides for a variable used for migration in the event that legacy equipment on a segment is updated to use RSTP. Link Aggregation Link aggregation is used to combine a number of ports together to make a single high-bandwidth data pipeline. The participating parts are called members of a link aggregation group, with one port designated as the master port of the group. Since all members of the link aggregation group must be configured to operate in the same manner, the configuration of the master port is applied to all members of the link aggregation group. Thus, when configuring the ports in a link aggregation group, you only need to configure the master port. The DES-3226S supports link aggregation groups, which may include from 2 to 8 Switch ports each, except for a Gigabit link aggregation group which consists of the 2 (optional) Gigabit Ethernet ports of the front panel. These ports are the two 1000BASE-SX, -LX -TX or GBIC ports contained in a front-panel mounted module. Static vs. LACP Link Aggregation DES-3226S Release 4.01 firmware supports the option of designating LACP compliant ports for link aggregation groups. IEEE 802.1ad Link Aggregation Control Protocol (LACP) is used to negotiate a dynamic aggregated link between this Switch and another network device. For static aggregated links (the default port setting for link agregation is static), the linked Switches must be manually configured and do not allow dynamic changes to the aggregated port group. For dynamic aggregated links (designated LACP-compliant ports), the Switches must comply with LACP to allow negotiation of the aggregated link. Dynamic link aggregation can be negotiated if one port group is configured to be the "active" group while the other port group is desigated as a "passive" group. Figure 5 - 3. Link Aggregation Group 29

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DES-3226S Layer 2 Fast Ethernet Switch User’s Guide
29
The edge port is a configurable designation used for a port that is directly connected to a segment where a loop cannot be
created. An example would be a port connected directly to a single workstation.
Ports that are designated as edge ports,
transition to a forwarding state immediately without going through the listening and learning states. An edge port loses its
status if it receives a BPDU packet, immediately becoming a normal spanning tree port.
P2P Port
A P2P port is also capable of rapid transition. P2P ports may be used to connect to other bridges. Under RSTP, all ports
operating in full-duplex mode are considered to be P2P ports, unless manually overridden through configuration.
802.1d/802.1w Compatibility
RSTP can interoperate with legacy equipment and is capable of automatically adjusting BPDU packets to 802.1d format when
necessary. However, any segment using 802.1 STP will not benefit from the rapid transition and rapid topology change
detection of RSTP. The protocol also provides for a variable used for migration in the event that legacy equipment on a
segment is updated to use RSTP.
Link Aggregation
Link aggregation is used to combine a number of ports together to make a single high-bandwidth data pipeline. The
participating parts are called members of a link aggregation group, with one port designated as the
master port
of the group.
Since all members of the link aggregation group must be configured to operate in the same manner, the configuration of the
master port is applied to all members of the link aggregation group. Thus, when configuring the ports in a link aggregation
group, you only need to configure the master port.
The DES-3226S supports link aggregation groups, which may include from 2 to 8 Switch ports each, except for a Gigabit link
aggregation group which consists of the 2 (optional) Gigabit Ethernet ports of the front panel.
These ports are the two
1000BASE-SX, -LX –TX or GBIC ports contained in a front-panel mounted module.
Static vs. LACP Link Aggregation
DES-3226S Release 4.01 firmware supports the option of designating LACP compliant ports for link aggregation groups.
IEEE 802.1ad Link Aggregation Control Protocol (LACP) is used to negotiate a dynamic aggregated link between this Switch
and another network device. For static aggregated links (the default port setting for link agregation is static), the linked
Switches must be manually configured and do not allow dynamic changes to the aggregated port group. For dynamic
aggregated links (designated LACP-compliant ports), the Switches must comply with LACP to allow negotiation of the
aggregated link. Dynamic link aggregation can be negotiated if one port group is configured to be the “active” group while the
other port group is desigated as a “passive” group.
Figure 5 - 3. Link Aggregation Group