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SmartConnect User’s Guide
BMD00082, February 2009 Chapter 8: Virtual Switch Groups
99
Link Aggregation Control Protocol
Link Aggregation Control Protocol (LACP) is an IEEE 802.3ad standard for grouping several
physical ports into one logical port (known as a dynamic trunk group or Link Aggregation
group) with any device that supports the standard. Please refer to IEEE 802.3ad-2002 for a full
description of the standard.
The 802.3ad standard allows standard Ethernet links to form a single Layer 2 link using the
Link Aggregation Control Protocol (LACP). If a link in a LACP trunk group fails, traffic is
reassigned dynamically to the remaining link or links of the dynamic trunk.
To configure Link Aggregation Control Protocol on a VSG, select enable in the drop-down
list. When disabled (as by default), external ports in the VSG’s external trunk act as a static
trunk. Click Apply to make the changes active, and Save to retain them beyond reboot.
IGMP Snooping
To configure IGMP Snooping on a VSG, select enable in the drop-down list.
IGMP Snooping allows the switch to forward multicast traffic only to those ports that request
it. IGMP Snooping prevents multicast traffic from being flooded to all ports. The switch learns
which server hosts are interested in receiving multicast traffic, and forwards it only to ports
connected to those servers.
BPDU Policy
To configure the Spanning Tree BPDU policy for a VSG, select the desired policy, as follows:
drop: If BPDUs are received on ports belonging to this group, the BPDUs are dropped.
guard: If BPDUs are received on a port belonging to this group, the port is disabled.
flood: If BPDUs are received on ports belonging to this group, the BPDUs are flooded on
all ports in the group. Use this setting if the Switch Group’s external ports are connected to
upstream switches that have Spanning Tree enabled.
Reset to Default
To reset items in this window for a specific VSG, select Reset to default all group’s set-
tings, and click Apply.
Note – This action will also de-assign any ACLs configured for the VSG.
See also:
“External Port Settings” on page 103