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Manageable Mosaic switch Installation and User Guide
priority 3 egress, followed by four frames from priority 2, followed by two frames from priority 1
and last one frame from priority 1. If level of forwarding is similar between the ports, it is
recommended to use priority option 1111. Otherwise, use 8421.
PONL –Not relevant to this product.
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It is for the user to set the right configuration of Aging time and Priority policy in order to enable the most
efficient network performances, according to the application that runs on the network and the type of
devices connected to the specific ports.
The switch maintains an updated MAC address look-up table by continuously learning and flooding. The
switch can be configured to remove unused addresses or those that are not used for a specified period
(via aging time) so that time is not wasted forwarding to an irrelevant port.
Each new look-up table entry is given a timestamp. Every time a packet is received from a node, the
timestamp is updated. The entry is erased from the look-up table; after the user configurable length of
aging time with no activity from that node (MAC address) has elapsed.
Setting a too short value for aging time may cause addresses to be removed prematurely from the
table. In this case, when the switch receives a packet for that destination, it floods the packet to all
ports. This unnecessary flooding can impact network performance. Setting too long an aging time can
cause the address table to be filled with unused addresses; it can cause delays in establishing
connectivity when a workstation is moved to a new port.
Address migration capabilities – when a device is moved to a differed port in the same switch, the move
is identified by the switch, after the first transmission from the device, and the MAC table immediately
updates without aging as soon as the connected device transmits signals.
Figure 3-20 Features menu, Global Configuration tab
3.6.2 VLAN Mode
The IS-2 supports 802.1Q VLANs and Port Based VLAN. Before a VLAN can be defined, the VLAN
type must be selected from the VLAN Mode tab.
Figure 3-21 Features menu, VLAN Mode tab
NOTE: Only one type of VLAN setting can be active at any given time. If 802.1q VLANs
are enabled, the Port Based VLAN (port forwarding table) is Disabled, and vice-versa.
Port-based VLAN is similar to private VLANs in Cisco terminology, where are 802.1q VLAN is close to
switchport access/trunk modes in Cisco terminology.
SUMMARY
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