Fujitsu PRIMERGY BX900 User Manual page 21

Port-based VLANs classify incoming packets to VLANs based on their ingress port. A frame is
assigned to a VLAN based solely on the switch port on which the frame arrives. All frames
received on a given port will be assigned to the same VLAN.
b) Protocol-based VLANs
VLAN classification rules are defined on data-link layer (Layer 2) protocol identification. Protocol
based VLANs isolate Layer 2 traffic for differing Layer 3 protocols. All Frames are assigned to
different VLANs according to the protocols on which they are running, e.g., IP, IPX, and ARP.
For example, users could assign frames running on top of IP protocol to a VLAN while the frames
running on top of IPX protocol are assigned to another VLAN.
c) MAC address-based VLANs
In MAC address-based VLANs, the MAC address of a station is assigned to a VLAN. Each
switch maintains an assignment table of MAC addresses and their corresponding VLAN
memberships. The source or destination MAC address determines to which VLAN a packet is
passed.
d) IP Subnet-based VLANs
It supports to re-map the IP subnet address of an end station to a VLAN.
Full 802.1Q VLAN Tagging Compliance
IEEE 802.1Q defines an architecture for virtual bridged LANs, the services provided in VLANs and the
protocols and algorithms involved in the provision of these services. An important requirement included
in this standard is the ability to mark frames with a desired Class of Service (CoS) tag value (0-7).
GVRP Support
GARP VLAN Registration Protocol (GVRP) provides IEEE 802.1Q-compliant VLAN pruning and
dynamic VLAN creation on 802.1Q trunk ports. When GVRP is enabled, the Ethernet Connection Blade
Module registers and propagates VLAN membership on all ports that are part of the active underlying
"Spanning Tree Protocol Features" topology.
GMRP Protocol
GARP Multicast Registration Protocol (GMRP) is a Generic Attribute Registration Protocol (GARP)
application that provides a constrained multicast flooding facility similar to IGMP snooping. GMRP and
GARP are industry-standard protocols defined by the IEEE 802.1p.GMRP provides a mechanism that
allows bridges and end stations to dynamically register group membership information with the MAC
bridges attached to the same LAN segment and for that information to be disseminated across all
bridges in the Bridged LAN that supports extended filtering services. The operation of GMRP relies upon
the services provided by the GARP. GMRP software components run on both the Ethernet Connection
Blade and on the host. On the host, GMRP is typically used with IGMP: the host GMRP software spawns
Layer 2 GMRP versions of the host's Layer 3 IGMP control packets. The Ethernet Connection Blade
receives both the Layer 2 GMRP and the Layer 3 IGMP traffic from the host. The switch uses the
received GMRP traffic to constrain.
VLAN Trunking Protocol
VLAN Trunk Protocol (VTP) reduces administration in a switched network. When user configures a new
VLAN on one VTP server, the VLAN is distributed through all switches in the domain. This reduces the
need to configure the same VLAN everywhere. There are four modes supported, including server mode,
client mode, transparent mode, and none VTP mode.
VTP is a Layer 2 messaging protocol that maintains VLAN configuration consistency by managing the
addition, deletion, and renaming of VLANs on a network-wide basis. VTP minimizes miss-configurations
and configuration inconsistencies that can result in a number of problems, such as duplicate VLAN
names, incorrect VLAN-type specifications, and security violations.
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