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The SmartSwitch 2000 Chassis View
2-62 Managing the Hub
When 802.1Q is implemented for a SmartSwitch 2000 that has an HSIM-A6DP
installed, each LEC will be represented as an individual port which can be easily
assigned membership in a VLAN.
Once VLANs have been conÞgured and activated, all frames with unknown
destination addresses (including broadcast, unknown multicast, and unknown
unicast frames) will be contained within the VLAN of their origin. The switchÕs
Filtering Database tracks the associations between MAC addresses, VLAN
eligibilities, and port numbers, and is used to make forwarding decisions for
frames. All VLANs share a single Spanning Tree.
Ingress List Operation
A portÕs ingress list speciÞes the VLAN with which received frames will be
associated. The switchÕs Filtering Database tracks the associations between VLAN
eligibilities, MAC addresses, and port numbers.
Untagged frames received by an 802.1Q switch port are classiÞed according to the
VLAN membership of the port that receives the frame.
Tagged frames received by an 802.1Q switch port are classiÞed according to the
VLAN indicated in their tag header. A port may receive a tagged frame that
speciÞes a VLAN other than the one assigned to the port.
Egress List Operation
Each portÕs egress list speciÞes which VLANs are associated with the port, and
speciÞes what type of frame (tagged or untagged) to transmit for each particular
VLAN on a port. This information may be statically deÞned by the user, or
dynamically learned and maintained by the switchÕs Filtering Database.
If a port receives a tagged frame that speciÞes a VLAN other than the one
assigned to the port, the switch will dynamically associate that frameÕs source
address and VLAN with the port (i.e., add that frameÕs VLAN to the receiving
NOTE
When 802.1Q mode is initially activated on a device, all ports are associated with the
Default VLAN (VLAN ID 1). If a VLAN ID has not been assigned to a particular port
on an 802.1Q switch, any frames received from that port will be classiÞed as belonging to
the Default VLAN.
NOTE
For SmartSwitch 2000 Þrmware version 4.00.08 and above, the number of LECs
supported by the HSIM-A6DP in 802.1Q mode is limited to 32.