Waters Network Systems
2800M/MR User’s Manual
Page 54
Symmetric VLAN:
Symmetric VLAN follows an 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 to see if port 1 is a member of VLAN100. If it is, 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. If SVL is
Disabled
, it means learning mode is IVL. In this mode, different VLANs use a 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 untagged ones,
which means that tag with PVID will be added into all packets. These packets will be forwarded as Tag-
based VLAN. So, the incoming packets with tag will become the double-tag ones.
Figure 5.20 – VLAN Mode
5.12.2
Tag-based Group
Function name:
Tag-based Group Configuration
