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VLAN Trunking

  • ISL—Cisco's proprietary method of trunk encapsulation for carrying VLANs over FE and GE. You use the VLAN header and trailer outside the frame (external tag).

  • IEEE 802.1q—IEEE standard for trunk encapsulation for carrying VLANs over FE and GE. Uses internal 4-byte tag that is placed before the Type/Length field of frames.

  • VTP—Cisco's method of distributing VLAN information between Catalyst switches.

  • VLAN pruning—Limits the flooding of broadcasts to switches that do not require them.

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