D-Link xStack DGS-3426, User Manual

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xStack DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch
VLAN Segmentation
Take for example a packet that is transmitted by a machine on Port 1 that is a member of VLAN 2. If the destination lies on
another port (found through a normal forwarding table lookup), the Switch then looks to see if the other port (Port 10) is a member
of VLAN 2 (and can therefore receive VLAN 2 packets). If Port 10 is not a member of VLAN 2, then the packet will be dropped
by the Switch and will not reach its destination. If Port 10 is a member of VLAN 2, the packet will go through. This selective
forwarding feature based on VLAN criteria is how VLANs segment networks. The key point being that Port 1 will only transmit
on VLAN 2.
VLAN and Trunk Groups
The members of a trunk group have the same VLAN setting. Any VLAN setting on the members of a trunk group will apply to
the other member ports.
NOTE: In order to use VLAN segmentation in conjunction with port trunk groups, first set the
port trunk group(s), and then configure the VLAN settings. To change the port trunk grouping
with VLANs already in place it is unnecessary to reconfigure the VLAN settings after changing
the port trunk group settings. VLAN settings will automatically change in conjunction with the
change of the port trunk group settings.
Protocol VLANs
The xStack DGS -3400 Switch Series incorporates the idea of protocol-based VLANs. This standard, defined by the IEEE 802.1v
standard maps packets to protocol-defined VLANs by examining the type octet within the packet header to discover the type of
protocol associated with it. After assessing the protocol, the Switch will forward the packets to all ports within the protocol-
assigned VLAN. This feature will benefit the administrator by better balancing load sharing and enhancing traffic classification.
The Switch supports fourteen (14) pre-defined protocols for configuration. The user may also choose a protocol that is not one of
the fourteen defined protocols by properly configuring the
userDefined protocol VLAN. The supported protocols for the protocol
VLAN function on this switch include IP, IPX, DEC LAT, SNAP, NetBIOS, AppleTalk, XNS, SNA, IPv6, RARP and VINES.
The following is a list of type headers for each protocol listed for VLAN configuration.
Protocol Type Header in Hexadecimal Form
IP over Ethernet 0x0800
IPX 802.3 0xFFFF
IPX 802.2 0xE0E0
IPX SNAP 0x8137
IPX over Ethernet2 0x8137
DEC LAT 0x6004
SNA 802.2 0x0404
netBios 0xF0F0
XNS 0x0600
VINES 0x0BAD
IPv6 0x86DD
AppleTalk 0x809B
RARP 0x8035
SNA over Ethernet2 0x80D5
Table 7- 2. Protocol VLAN and the corresponding type header
In configuring the user-defined protocol, the administrator must make sure that the pre-defined user type header does not match
any other type header. A match may cause discrepancies within the local network and failure to define the VLAN to which to
forward packets.
Static VLAN Entry
To view this window click, L2 Features > VLAN > Static VLAN Entries to open the following window:
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