B&B Electronics 516TX-A - Manual - Manual (Page 32)

(Revised 8/4/2009) 32
Tagged VLAN
Tagged VLAN is in accordance with IEEE 802.1Q.
When configuring each group:
o choose VID ( 2-511 ranged on input) (except group1 is always VID=1)
o choose member ports (any, all or none)
o by port, choose if this is the primary VID for the port.
o by port, for this group, choose if outgoing packets are untagged
( a port could tx untagged if one VID and tagged if another VID)
When configuring untagged incoming packet handling:
- Drop all untagged incoming packets, or which ports to do this on.
( If untagged incoming packets are accepted by a port, the port's PVID will be used as the tag.
If also the port transmits tagged for the group, that PVID will be used outgoing.)
Note that:
• ‘bfilter’ must be disabled (all ports receiving broadcast) before enabling vlan.
• Ports are deleted from group1 as each port is added to another group.
• Ports are added to group1 if a deletion leaves a port with no group.
(Every port always has at least one group.)
• These automatic adds/deletes to/from group1 are messaged to the console.
• If it is desired to have a port on group1 and also on other group(s) configure group1 last to achieve that.
If group1 is configured last and ports are left out of all groups, they'll be added to group1 and you'll see
a message.
Warnings:
Network administrators must ensure ports with non-802.1Q-compliant devices attached are configured to
transmit untagged frames. Many network interface cards for PCs and printers are not 802.1Q-compliant. If
they receive a tagged frame, they will not understand the VLAN tag and will drop the frame. Also, the
maximum legal Ethernet frame size for tagged frames was increased in 802.1Q (and its companion, 802.3ac)
from 1,518 to 1,522 bytes. This could cause network interface cards and older switches to drop tagged
frames as "oversized."
Up to 8 VLAN groups can be configured, and each group can have from zero to all ports as members.
Tagged VLAN Menu:
Command Description Comment
info Displays the current VLAN settings.
disable (or enable) Enable Disable VLAN Choice is opposite of current state
untagged Untagged pkt handling How to handle untagged incoming packets, by port
port Switch to Port Based VLAN
group1 configure tagged VLAN Group 1 Select VID and member ports
group2 configure tagged VLAN Group 2 Select VID and member ports
group3 configure tagged VLAN Group 3 Select VID and member ports
group4 configure tagged VLAN Group 4 Select VID and member ports
Group5 configure tagged VLAN Group 5 Select VID and member ports
Group6 configure tagged VLAN Group 6 Select VID and member ports
Group7 configure tagged VLAN Group 7 Select VID and member ports
Group8 configure tagged VLAN Group 8 Select VID and member ports
cleargroups clear all 8 tagged VLAN Groups