wiki:site:cisco:ccnp:switch:vlan_trunks
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wiki:site:cisco:ccnp:switch:vlan_trunks [2018/01/16 11:15] root [DTP (Cisco )- Dynamic Trunking Protocol] |
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| - | ====== VLAN Trunks ====== | ||
| - | **ISL - Inter Switch Link (Cisco)** | ||
| - | * Enkapsuluje celý L2 rámec | ||
| - | * 26-byte header (15-bit VLAN ID) | ||
| - | * 4-byte trailer (CRC) | ||
| - | * občas nazývaný //double tagging// | ||
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| - | **802.1Q - Standard** | ||
| - | * 4-byte pole vložené hned za SRC MAC | ||
| - | * //single tagging, internal tagging// | ||
| - | * //native// VLAN = netagovaná | ||
| - | * první 2 byty = TPID (Tag Protocol Identifier) vždy 0x8100 (802.1Q) | ||
| - | * další 2 byty = TCI (Tag Control Information) | ||
| - | * 3-bity CoS (Class of Service 802.1Q/ | ||
| - | * 1-bit CFI (Canonical Format Indicator) - určuje zda se jedná o Ethernet nebo TokenRing. Nazývá se též // | ||
| - | * 12-bitů VID (VLAN Identifier) 0-4095 (0,1 a 4095 rezervovány) | ||
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wiki/site/cisco/ccnp/switch/vlan_trunks.1516097758.txt.gz · Last modified: 2018/01/16 11:15 by root
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