ZyXEL Communications IES-1000 Forwarding Process Example, Modify a Static VLAN Table Example, Figure 31-3Example: SVLAN List Command Display

IES-1000 User’s Guide

Modify a Static VLAN Table Example

The following is an example of how to modify a static VLAN table.

1.	192.168.1.1 vlan1q> svlan setentry	3	3	fixed	untag
2.	192.168.1.1 vlan1q> svlan setentry	2	2	fixed	untag
3.	192.168.1.1 vlan1q> svlan setentry	1	1	fixed	tag

4.192.168.1.1 vlan1q> svlan list

The arrows in the figure shown next point to the lines that have been modified in this table as a result of the previous commands.

		vid	port#	ad_control	tag_control
	--------		-------	------------	------------
3.		1	1	fixed	tag
			2	normal	untag
			3	normal	untag
	2		1	normal	untag
2.			2	fixed	untag
			3	normal	untag
	3		1	normal	untag
1.			2	normal	untag
			3	fixed	untag

Figure 31-3 Example: SVLAN List Command DisplayForwarding Process Example

The switch uses the SVLAN in making frame-forwarding decisions.

First the switch checks the MAC address in a frames header against the MAC filtering database.

Next the switch checks the VLAN ID (VID) of tagged frames or assigns temporary VIDs to untagged frames (see the PVID Command).

The switch then checks the VID in a frame’s tag against the SVLAN table.

The switch notes what the SVLAN table says (that is, the SVLAN tells the switch whether or not to forward a frame and if the forwarded frames should have tags).

Then the switch applies the port filter to finish the forwarding decision. This means that frames may be dropped even if the SVLAN says to forward them. Frames might also be dropped if they are sent to a CPE (customer premises equipment) DSL device that does not accept tagged frames.

The following figure shows the flow of the decision process used with a broadcast frame (one that is meant to go to all of the ports).

31-6 IEEE 802.1QTagged VLAN Commands