Chapter 45 IEEE 802.1Q Tagged VLAN Commands

45.4.4.1 Modify a Static VLAN Table Example

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

Figure 153 Modifying the Static VLAN Example

ras> switch vlan set 2000 1:FU ras> switch vlan set 2001 2:FU

45.4.4.2Forwarding Process Example

Tagged Frames

1First the IES-612-51A checks the VLAN ID (VID) of tagged frames or assigns temporary VIDs to untagged frames (see Section 45.4.2 on page 300).

2The IES-612-51A checks the frame’s source MAC address against the MAC filter.

3The IES-612-51A then checks the VID in a frame’s tag against the SVLAN table.

4The IES-612-51A notes what the SVLAN table says (that is, the SVLAN tells the IES- 612-51A whether or not to forward a frame and if the forwarded frames should have a tag).

5Frames might be dropped if they are sent to a CPE (customer premises equipment) DSL device that does not accept tagged frames.

Untagged Frames

1An untagged frame comes in from the LAN.

2The IES-612-51A checks the frame’s source MAC address against the MAC filter.

3The IES-612-51A checks the PVID table and assigns a VID and IEEE 802.1Q priority.

4The IES-612-51A ignores the port from which the frame came, because the IES-612- 51A does not send a frame to the port from which it came. The IES-612-51A also does not forward frames to “forbidden” ports.

5If after looking at the SVLAN, the IES-612-51A does not have any ports to which it will send the frame, it drops the frame.

45.4.5VLAN Frame Type Command

Syntax:

ras> switch vlan frametype <portlist> <alltag>

where

<portlist>

=

You can specify a single DSL port <1>, all DSL ports <*> or

 

 

a list of DSL ports <1,3 >. You can also include a range of

 

 

DSL ports <1,5,6~10>.

<alltag>

=

Use tag to have the specified port(s) accept only incoming

 

 

Ethernet frames that have a VLAN tag.

 

 

Use all to have the specified port(s) accept both tagged and

 

 

untagged incoming Ethernet frames.

This command sets the specified DSL ports to accept VLAN tagged Ethernet frames, or both tagged and untagged Ethernet frames.

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IES-612-51A User’s Guide