About the Switch 1000 1-3Switch Operation and FeaturesHow Does the Switch Compare to a Bridge?The table below shows how Switch 1000 operationcompares to that of a conventional IEEE 802.1dbridge.In all other ways, Switch 1000 and bridge opera-tion is identical.Forwarding of PacketsThe table below shows how a packet is processedwhen it arrives at the Switch 1000.You can configure the Switch to forward packetswith an unknown destination address to all ports inthe same VLAN as the source port. Refer to “SettingUp the Switch Unit” on page 4-9 for more informa-tion.IEEE 802.1d Bridge Switch 1000Address Learning All ports All ports except back-bone portForwarding Mode Store and forward Fast Forward, Frag-ment Free, Store andforward, or IntelligentOperation whenpacket buffers fullDiscard packets Invoke IntelligentFlow Management tosuppress transmis-sions at sourceSpanning Tree Supported OptionalAction onUnknownDestinationAddressFlood all ports Forward to backboneport, or forward toall portsDatabase size 4000 addresses 500 addressesPacket Source DestinationAddressActionAny port EXCEPT back-bone (Unicast packet)Unknown Forward to back-bone port only, orforward to all portsSame port assource addressFilterAnother port (notbackbone)Forward to specificport onlyAny port EXCEPT back-bone (Multi/Broadcastpacket)Not applicable Forward to all ports(including back-bone) in the sameVLAN as source portBackbone port(Unicast packet)Unknown FilterKnown port (notbackbone)Forward to knownport onlyBackbone port(Multi/Broadcast packet)Not applicable Forward to all portswithin specific VLAN
