Vlan learning settings
For devices supporting 802.1Q VLAN functionality, there are two possible modes for the operation of the Source Address Table:
- IVL (Independent Vlan Learning): VLANs each use their own logical Source Address Table. Transparent source address learning done as a result of ingressed vlan x traffic, is not made available on behalf of ingressed vlan ytraffic for forwarding purposes. This setting would be useful for handling devices (such as mainframes) with NICs which share a common MAC address. [/code]
- SVL (Shared Vlan Learning): Two or more VLANs are grouped to share common source address information. This setting would be useful for configuration of more complex "asymmetrical cross-vlan" traffic patterns, without forcing the switch to flood the unicast traffic in each direction.
Depending upon the product, the VLAN Learning setting will be global for the entire switch (SVL or IVL, potentially selectable), or can be configured in a more granular manner in that some VLANs each have unique FIDs while other VLANs share a FID.
A given device typically has a single Source Address Table, with each entry containing a FID parameter which can, if IVL is being used, make it appear that separate SATs are in use.
See 5397 for configuring IVL/SVL on a Matrix DFE.
See 5498 for related Matrix C1/SecureStack C3/C2/B3/B2/A2 information.