The MultiSwitch 700 Device View
2-62 Managing the Module
Ports on 802.1Q switches are assigned membership in a VLAN by associating a
VLAN ID with each port on the switch. The VLAN ID is combined with the port’s
identification (e.g., module X port X) to form the Port VLAN ID (PVID).
When 802.1Q is implemented for a MultiSwitch 700 that has a DELHA-UA
installed, each LEC will be represented as an individual port which can be easily
assigned membership in a VLAN.
Once VLANs have been configured 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 switch’s
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 port’s ingress list specifies the VLAN with which received frames will be
associated. The switch’s Filtering Database tracks the associations between VLAN
eligibilities, MAC addresses, and port numbers.
Untagged frames received by an 802.1Q switch port are classified according to the
VLAN membership of the port that receives the frame.
Tagged frames received by an 802.1Q switch port are classified according to the
VLAN indicated in their tag header. A port may receive a tagged frame that
specifies a VLAN other than the one assigned to the port.
Egress List Operation
Each port’s egress list specifies which VLANs are associated with the port, and
specifies what type of frame (tagged or untagged) to transmit for each particular
VLAN on a port. This information may be statically defined by the user, or
dynamically learned and maintained by the switch’s Filtering Database.
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 classified as belonging to
the Default VLAN.
NOTE
For current versions of MultiSwitch 700 firmware, the number of LECs supported by the
DELHA-UA in 802.1Q mode is limited to 32.