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Chapter 4: Operation of Web- based Management
filtering list or egress filtering list, the packet will be screened with
more filtering criteria to determine if it can be forwarded. The
switch supports supplement of 802.1q..
Each tag-based VLAN you built up must be assigned VLAN name
and VLAN ID. Valid VLAN ID is 1-4094. User can create total up
to 256 Tag VLAN groups.
Port-based:
Port-based VLAN is defined by port. Any packet coming in or out-
going from any one port of a port-based VLAN will be accepted.
No filtering criterion applies in port-based VLAN. The only cri-
terion is the physical port you connect to. For example, for a port-
based VLAN named PVLAN-1 contains port members Port
1&2&3&4. If you are on the port 1, you can communicate with
port 2&3&4. If you are on the port 5, then you cannot talk to them.
Each port-based VLAN you built up must be assigned a group
name. This switch can support up to maximal 26 port-based VLAN
groups.
Symmetric Vlan: This is a Ingress Rule (Rule 1, The Ingress Filtering
Rule 1 is "forward only packets with VID matching this port's configu-
red 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 diffe-
rent 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, howe-
ver, 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
LANCOM ES-2126+ and LANCOM ES-2126P+
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