
Chapter 9 VLAN
GS2200-24/24P User’s Guide
94
field of the Ethernet frame) and two bytes of TCI (Tag Control Information, starts
after the source address field of the Ethernet frame).
The CFI (Canonical Format Indicator) is a single-bit flag, always set to zero for
Ethernet switches. If a frame received at an Ethernet port has a CFI set to 1, then
that frame should not be forwarded as it is to an untagged port. The remaining
twelve bits define the VLAN ID, giving a possible maximum number of 4,096
VLANs. Note that user priority and VLAN ID are independent of each other. A
frame with VID (VLAN Identifier) of null (0) is called a priority frame, meaning that
only the priority level is significant and the default VID of the ingress port is given
as the VID of the frame. Of the 4096 possible VIDs, a VID of 0 is used to identify
priority frames and value 4095 (FFF) is reserved, so the maximum possible VLAN
configurations are 4,094.
Forwarding Tagged and Untagged Frames
Each port on the Switch is capable of passing tagged or untagged frames. To
forward a frame from an 802.1Q VLAN-aware switch to an 802.1Q VLAN-unaware
switch, the Switch first decides where to forward the frame and then strips off the
VLAN tag. To forward a frame from an 802.1Q VLAN-unaware switch to an 802.1Q
VLAN-aware switch, the Switch first decides where to forward the frame, and then
inserts a VLAN tag reflecting the ingress port's default VID. The default PVID is
VLAN 1 for all ports, but this can be changed.
A broadcast frame (or a multicast frame for a multicast group that is known by the
system) is duplicated only on ports that are members of the VID (except the
ingress port itself), thus confining the broadcast to a specific domain.
9.1.2.1 Automatic VLAN Registration
GARP and GVRP are the protocols used to automatically register VLAN
membership across switches.
GARP
GARP (Generic Attribute Registration Protocol) allows network switches to register
and de-register attribute values with other GARP participants within a bridged
LAN. GARP is a protocol that provides a generic mechanism for protocols that
serve a more specific application, for example, GVRP
.
TPID
2 Bytes
User Priority
3 Bits
CFI
1 Bit
VLAN ID
12 bits
Содержание GS2200-24P Series
Страница 2: ......
Страница 8: ...Safety Warnings GS2200 24 User s Guide 8...
Страница 22: ...22...
Страница 28: ...Chapter 1 Getting to Know Your Switch GS2200 24 24P User s Guide 28...
Страница 32: ...Chapter 2 Hardware Installation and Connection GS2200 24 24P User s Guide 32...
Страница 40: ...Chapter 3 Hardware Panels GS2200 24 24P User s Guide 40...
Страница 42: ...42...
Страница 52: ...Chapter 4 The Web Configurator GS2200 24 24P User s Guide 52...
Страница 90: ...Chapter 8 Basic Setting GS2200 24 24P User s Guide 90...
Страница 92: ...92...
Страница 110: ...Chapter 9 VLAN GS2200 24 24P User s Guide 110 Figure 58 Port Based VLAN Setup Port Isolation...
Страница 116: ...Chapter 10 Static MAC Forward Setup GS2200 24 24P User s Guide 116...
Страница 144: ...Chapter 13 Spanning Tree Protocol GS2200 24 24P User s Guide 144...
Страница 148: ...Chapter 14 Bandwidth Control GS2200 24 24P User s Guide 148...
Страница 152: ...Chapter 15 Broadcast Storm Control GS2200 24 24P User s Guide 152...
Страница 156: ...Chapter 16 Mirroring GS2200 24 24P User s Guide 156...
Страница 166: ...Chapter 17 Link Aggregation GS2200 24 24P User s Guide 166...
Страница 174: ...Chapter 19 Port Security GS2200 24 24P User s Guide 174...
Страница 186: ...Chapter 21 Policy Rule GS2200 24 24P User s Guide 186...
Страница 208: ...Chapter 23 Multicast GS2200 24 24P User s Guide 208...
Страница 246: ...Chapter 25 IP Source Guard GS2200 24 24P User s Guide 246...
Страница 255: ...255 PART IV IP Application Static Route 257 Differentiated Services 261 DHCP 265...
Страница 256: ...256...
Страница 260: ...Chapter 28 Static Route GS2200 24 24P User s Guide 260...
Страница 274: ...274...
Страница 304: ...Chapter 32 Access Control GS2200 24 24P User s Guide 304...
Страница 310: ...Chapter 34 Syslog GS2200 24 24P User s Guide 310...
Страница 318: ...Chapter 35 Cluster Management GS2200 24 24P User s Guide 318...
Страница 322: ...Chapter 36 MAC Table GS2200 24 24P User s Guide 322...
Страница 327: ...327 PART VI Troubleshooting Product Specifications Troubleshooting 329 Product Specifications 333...
Страница 328: ...328...
Страница 340: ...Chapter 40 Product Specifications GS2200 24 24P User s Guide 340...
Страница 341: ...341 PART VII Appendices and Index Changing a Fuse 343 Common Services 345 Legal Information 349 Index 353...
Страница 342: ...342...
Страница 344: ...Appendix A Changing a Fuse GS2200 24 24P User s Guide 344...
Страница 352: ...Appendix C Legal Information GS2200 24 24P User s Guide 352...