298:
120:
291:(ISPs), allowing them to use their VLANs internally while carrying traffic from clients that is already VLAN tagged. The outer (next to source MAC and representing ISP VLAN) S-TAG (service tag) comes first, followed by the inner C-TAG (customer tag). In such cases, 802.1ad specifies a TPID of 0x88a8 for service-provider outer S-TAG.
142:
fields of the original frame. Under 802.1Q, the maximum frame size is extended from 1,518 bytes to 1,522 bytes. The minimum frame size remains 64 bytes, but a bridge may extend the minimum size frame from 64 to 68 bytes on transmission. This allows a tag to be popped without needing additional
72:
Portions of the network which are VLAN-aware (i.e., IEEE 802.1Q conformant) can include VLAN tags. When a frame enters the VLAN-aware portion of the network, a tag is added to represent the VLAN membership. Each frame must be distinguishable as being within exactly one VLAN. A frame in the
226:) are reserved. All other values may be used as VLAN identifiers, allowing up to 4,094 VLANs. The reserved value 0x000 indicates that the frame does not carry a VLAN ID; in this case, the 802.1Q tag specifies only a priority (in PCP and DEI fields) and is referred to as a
257:), the EtherType value in the SNAP header is set to 0x8100 and the aforementioned extra 4 bytes are appended after the SNAP header. In other words the VLAN tag follows the SNAP header. For 802.3 frames in LLC-SNAP format, the order is opposite; the VLAN tag is placed
271:
The IEEE 802.3ac standard increased the maximum
Ethernet frame size from 1518 bytes to 1522 bytes to accommodate the four-byte VLAN tag. Some network devices that do not support the larger frame size will process these frames successfully but may report them as
190:
A 16-bit field set to a value of 0x8100 in order to identify the frame as an IEEE 802.1Q-tagged frame. This field is located at the same position as the EtherType field in untagged frames, and is thus used to distinguish the frame from untagged
234:
VLAN; this is vendor-specific. The VID value 0xFFF is reserved for implementation use; it must not be configured or transmitted. 0xFFF can be used to indicate a wildcard match in management operations or filtering database
1056:
143:
padding. Two bytes are used for the tag protocol identifier (TPID), the other two bytes for tag control information (TCI). The TCI field is further divided into PCP, DEI, and VID.
387:
VLAN membership is determined by the frame's port or the port/protocol combination, depending on whether port-based or port-and-protocol-based VLAN classification is being used.
1263:
2031:
216:
A 1-bit field. (formerly CFI) May be used separately or in conjunction with PCP to indicate frames eligible to be dropped in the presence of congestion.
297:
796:
66:
746:
721:
696:
671:
119:
2067:
2057:
318:
906:
246:
1332:
851:
646:
621:
596:
304:
1031:
550:
425:
networks. If a frame received at an
Ethernet port had a CFI set to 1, then that frame would not be bridged to an untagged port.
333:
326:
126:
1313:
322:
1288:
789:
2131:
1697:
1258:
961:
876:
856:
2100:
829:
805:
242:
31:
757:
469:
210:
and maps to the frame priority level. Different PCP values can be used to prioritize different classes of traffic.
1667:
866:
361:
355:
288:
1101:
264:
Because inserting the VLAN tag changes the frame, 802.1Q encapsulation forces a recalculation of the original
222:
A 12-bit field specifying the VLAN to which the frame belongs. The values of 0 and 4095 (0x000 and 0xFFF in
2136:
2105:
966:
956:
936:
782:
349:
325:, allowing bridges to negotiate the set of VLANs to be used over a specific link. MVRP replaced the slower
1278:
839:
367:
249:(OUI) field of 00-00-00 (so that the protocol ID field in the SNAP header is an EtherType as specified in
2072:
1195:
931:
1338:
1268:
1086:
1016:
265:
1981:
1976:
1971:
1966:
1961:
1956:
1951:
73:
VLAN-aware portion of the network that does not contain a VLAN tag is assumed to be flowing on the
1220:
1096:
656:
IEEE Std. 802.1Q-2011, Media Access
Control (MAC) Bridges and Virtual Bridged Local Area Networks
231:
58:
2126:
1769:
1764:
1744:
1728:
1722:
1717:
1712:
1707:
1702:
1692:
1687:
1677:
1672:
1308:
1138:
742:
717:
692:
667:
642:
617:
592:
1897:
1638:
1633:
1623:
1618:
1613:
1608:
1603:
1598:
1588:
1583:
1578:
1573:
1563:
1558:
1553:
1548:
1533:
1528:
1523:
1518:
1513:
421:. It is always set to zero for Ethernet. CFI was used for compatibility between Ethernet and
1662:
1328:
734:
709:
684:
659:
634:
609:
584:
250:
207:
105:
92:
standards committee, and continues to be actively revised with notable amendments including
27:
1091:
552:
Understanding Baby Giant/Jumbo Frames
Support on Catalyst 4000/4500 with Supervisor III/IV
358:(DTP), a Cisco proprietary protocol to negotiate trunking between two VLAN-aware devices
1946:
1076:
1071:
991:
941:
54:
50:
46:
364:(TSN), a suite of enhancements to 802.1Q for realtime and time-critical data streaming
2120:
2052:
1996:
1991:
1986:
1936:
1931:
1926:
1916:
1892:
1868:
1856:
1845:
1834:
1822:
1817:
1812:
1807:
1794:
1783:
1273:
1253:
1106:
1081:
1011:
901:
846:
761:
473:
85:
731:
IEEE Std. 802.1Q-2014/Cor 1-2015, Corrigendum 1: Technical and editorial corrections
559:
2036:
2026:
1774:
1759:
1754:
1749:
1739:
1682:
1323:
1318:
1303:
1298:
1293:
1243:
284:
97:
93:
445:
738:
713:
688:
681:
IEEE Std. 802.1BR-2012, Virtual
Bridged Local Area Networks—Bridge Port Extension
663:
1908:
1648:
1402:
1283:
1238:
1215:
1210:
1205:
1200:
1183:
1178:
1168:
638:
418:
401:
337:
254:
223:
204:
135:
101:
62:
613:
588:
2021:
2016:
1348:
1230:
1163:
1158:
1153:
1148:
1143:
1133:
422:
81:
35:
2082:
2062:
1920:
1173:
1066:
1061:
1046:
1036:
1026:
1006:
1001:
986:
976:
971:
951:
946:
926:
921:
916:
911:
896:
861:
139:
287:
introduced the concept of double tagging. Double tagging can be useful for
1353:
1125:
1116:
834:
824:
819:
89:
38:
2077:
1873:
1839:
1788:
1733:
1628:
1593:
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1538:
1508:
1503:
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1459:
1454:
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1444:
1438:
1432:
1427:
1422:
1417:
1362:
996:
981:
230:. On bridges, VID 0x001 (the default VLAN ID) is often reserved for a
1940:
1412:
1407:
1397:
1392:
1387:
1382:
1377:
1372:
1367:
1041:
871:
57:
in handling such frames. The standard also contains provisions for a
1798:
1653:
1188:
1051:
891:
540:
IEEE 802.1Q-2011 clause 9.4 Tag
Protocol Identifier (TPID) formats
774:
1021:
886:
881:
778:
332:
The 2003 revision of the standard was the first to include the
631:
IEEE Std. 802.1Q-2005, Virtual
Bridged Local Area Networks
606:
IEEE Std. 802.1Q-2003, Virtual
Bridged Local Area Networks
581:
IEEE Std. 802.1Q-1998, Virtual
Bridged Local Area Networks
352:(ISL), an older Cisco proprietary VLAN management protocol
145:
329:(GVRP) in 2007 with the IEEE 802.1ak-2007 amendment.
307:
Insertion of 802.1ad double tag in an
Ethernet frame
197:
A 16-bit field containing the following sub-fields:
2045:
2009:
1907:
1647:
1347:
1229:
1124:
1115:
812:
706:
IEEE Std. 802.1Q-2014, Bridges and Bridged Networks
370:(VTP), a Cisco proprietary VLAN management protocol
531:IEEE 802.1Q-2005, 9.6 VLAN Tag Control Information
758:"Inter-Switch Link and IEEE 802.1Q Frame Format"
470:"Inter-Switch Link and IEEE 802.1Q Frame Format"
417:with a value of 0 indicating a MAC address in
134:802.1Q adds a 32-bit field between the source
49:and the accompanying procedures to be used by
790:
8:
129:Insertion of 802.1Q tag in an Ethernet frame
104:. The 802.1Q-2014 revision incorporated the
241:For frames (other than 802.3 frames) using
1121:
797:
783:
775:
446:802.1Q-2014 - Bridges and Bridged Networks
41:network. The standard defines a system of
16:IEEE networking standard supporting VLANs
168:
165:
61:prioritization scheme commonly known as
438:
380:
336:(MSTP) which was originally defined in
67:Generic Attribute Registration Protocol
503:I.4 Traffic types and priority values
7:
413:This field was formerly designated
319:Multiple VLAN Registration Protocol
247:organizationally unique identifier
203:A 3-bit field which refers to the
14:
415:Canonical Format Indicator (CFI)
296:
118:
334:Multiple Spanning Tree Protocol
327:GARP VLAN Registration Protocol
268:field in the Ethernet trailer.
323:Multiple Registration Protocol
321:(MVRP), an application of the
187:Tag protocol identifier (TPID)
80:The standard was developed by
1:
522:IEEE 802.1Q-2011 clause 6.9.3
245:(SNAP) encapsulation with an
213:Drop eligible indicator (DEI)
194:Tag control information (TCI)
32:virtual local area networking
739:10.1109/IEEESTD.2016.7374647
714:10.1109/IEEESTD.2014.6991462
689:10.1109/IEEESTD.2012.6239543
664:10.1109/IEEESTD.2011.6009146
456:Per IEEE 802.1Q Annex G.2.3
179:
176:
173:
157:
154:
639:10.1109/IEEESTD.2006.216285
513:IEEE 802.1Q-2005 clause 9.6
492:IEEE 802.1Q-2011 clause 9.6
160:
2155:
2101:IEEE Standards Association
614:10.1109/IEEESTD.2003.94280
589:10.1109/IEEESTD.1999.89204
289:Internet service providers
243:Subnetwork Access Protocol
2091:
362:Time Sensitive Networking
356:Dynamic Trunking Protocol
200:Priority code point (PCP)
151:
317:IEEE 802.1Q defines the
2106:Category:IEEE standards
350:Cisco Inter-Switch Link
30:standard that supports
22:, often referred to as
368:VLAN Trunking Protocol
208:class of service (CoS)
261:the LLC-SNAP header.
219:VLAN identifier (VID)
266:frame check sequence
148:
2132:Ethernet standards
232:network management
147:802.1Q tag format
146:
59:quality-of-service
2114:
2113:
2005:
2004:
748:978-1-5044-0112-8
723:978-0-7381-9433-2
698:978-0-7381-7281-1
673:978-0-7381-6708-4
184:
183:
2144:
1122:
799:
792:
785:
776:
771:
769:
768:
751:
726:
701:
676:
651:
626:
601:
567:
566:
564:
558:, archived from
557:
547:
541:
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529:
523:
520:
514:
511:
505:
499:
493:
490:
484:
483:
481:
480:
466:
460:
458:Minimum PDU size
454:
448:
443:
426:
419:canonical format
411:
405:
394:
388:
385:
300:
149:
122:
106:IEEE 802.1D-2004
65:and defines the
2154:
2153:
2147:
2146:
2145:
2143:
2142:
2141:
2117:
2116:
2115:
2110:
2087:
2041:
2001:
1903:
1651:
1643:
1351:
1343:
1225:
1111:
808:
803:
766:
764:
756:
749:
729:
724:
704:
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679:
674:
654:
649:
629:
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451:
444:
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408:
395:
391:
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382:
377:
346:
315:
313:Other protocols
310:
309:
308:
306:
301:
282:
132:
131:
130:
128:
123:
114:
47:Ethernet frames
17:
12:
11:
5:
2152:
2151:
2148:
2140:
2139:
2137:Link protocols
2134:
2129:
2119:
2118:
2112:
2111:
2109:
2108:
2103:
2098:
2092:
2089:
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2024:
2019:
2013:
2011:
2007:
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1128:
1119:
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1029:
1024:
1019:
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989:
984:
979:
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964:
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949:
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929:
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919:
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879:
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864:
859:
854:
849:
844:
843:
842:
832:
827:
822:
816:
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810:
809:
806:IEEE standards
804:
802:
801:
794:
787:
779:
773:
772:
754:
753:
752:
747:
722:
702:
697:
677:
672:
652:
647:
627:
622:
602:
597:
575:
572:
569:
568:
542:
533:
524:
515:
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494:
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461:
449:
437:
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431:
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406:
389:
379:
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372:
371:
365:
359:
353:
345:
342:
314:
311:
303:
302:
295:
294:
293:
281:
280:Double tagging
278:
239:
238:
237:
236:
220:
217:
214:
211:
201:
195:
192:
188:
182:
181:
178:
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170:
167:
163:
162:
159:
156:
153:
125:
124:
117:
116:
115:
113:
110:
34:(VLANs) on an
15:
13:
10:
9:
6:
4:
3:
2:
2150:
2149:
2138:
2135:
2133:
2130:
2128:
2125:
2124:
2122:
2107:
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2102:
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2018:
2015:
2014:
2012:
2008:
1998:
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1894:
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1878:
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1376:
1374:
1371:
1369:
1366:
1364:
1361:
1360:
1358:
1355:
1350:
1346:
1340:
1337:
1334:
1330:
1327:
1325:
1322:
1320:
1317:
1315:
1312:
1310:
1307:
1305:
1302:
1300:
1297:
1295:
1292:
1290:
1287:
1285:
1282:
1280:
1277:
1275:
1272:
1270:
1267:
1265:
1262:
1260:
1257:
1255:
1252:
1250:
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1245:
1242:
1240:
1237:
1236:
1234:
1232:
1228:
1222:
1219:
1217:
1214:
1212:
1209:
1207:
1204:
1202:
1199:
1197:
1194:
1190:
1189:WiMAX · d · e
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112:Frame format
98:IEEE 802.1ak
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79:
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43:VLAN tagging
42:
23:
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18:
1668:legacy mode
402:hexadecimal
396:The prefix
338:IEEE 802.1s
276:anomalies.
224:hexadecimal
205:IEEE 802.1p
136:MAC address
102:IEEE 802.1s
75:native VLAN
63:IEEE 802.1p
20:IEEE 802.1Q
2121:Categories
2046:Superseded
1117:802 series
767:2019-01-10
479:2019-09-26
433:References
423:Token Ring
400:indicates
274:baby giant
108:standard.
82:IEEE 802.1
36:IEEE 802.3
28:networking
1921:Bluetooth
140:EtherType
26:, is the
2127:IEEE 802
2096:See also
2053:754-1985
2010:Proposed
1354:Ethernet
840:Revision
608:, 2003,
404:notation
344:See also
235:entries.
161:12 bits
152:16 bits
138:and the
90:IEEE 802
55:switches
39:Ethernet
2037:P1906.1
1898:Wi-Fi 8
1874:Wi-Fi 7
1840:Wi-Fi 6
1789:Wi-Fi 5
1734:Wi-Fi 4
813:Current
574:Sources
191:frames.
155:3 bits
88:of the
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1941:Zigbee
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1799:WiGig
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1654:Wi-Fi
1363:-1983
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1231:802.1
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563:(PDF)
556:(PDF)
375:Notes
166:TPID
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