LevelOne GSW-2690 Manuale Utente

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 Symmetric Vlan: 

This is a Ingress Rule (Rule 1, The Ingress Filtering Rule 1 is “forward 
only packets with VID matching this port’s configured VID”.). For example, 
if port 1 receives a tagged packet with VID=100 (VLAN name=VLAN100), 
and if Symmetric-Vlan function

 

is enabled, the switch will check if port 1 

is a member of VLAN100. If yes, the received packet is forwarded; 
otherwise, the received packet is dropped.

  

Note: If Symmetric is enabled and port 1, for example, receives an untagged packet, 

the switch will apply the PVID of port 1 to tag this packet, the packet then will 
be forwarded. But if the PVID of port 1 is not 100, the packet will be dropped. 

 

SVL: 

While SVL is enable, all VLANs use the same filtering database storing 
the membership information of the VLAN to learn or look up the 
membership information of the VLAN. While SVL is disable, it means 
learning mode is IVL. In this mode, different VLAN uses different filtering 
database storing the membership information of the VLAN to learn or 
look up the information of a VLAN member. 

Double Tag:  

Double-tag mode belongs to the tag-based mode, however, it would treat 
all frames as the untagged ones, which means that tag with PVID will be 
added into all packets. Then, these packets will be forwarded as Tag-
based VLAN. So, the incoming packets with tag will become the double-
tag ones. 

 

 

 Fig. 3-18