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The concept of trunking began with the telephone industry. • Multiple calls were moved between customers and central offices or between the offices themselves over a single physical connection.The same principle was applied to data communications to make better use of the communication line. • Additional advantages and cost savings were gained by using the same line for voice communications.The same principle of trunking is applied to network switching technologies. • A trunk is a physical and logical connection between two switches across which network traffic travels | Chapter 3 Virtual Local Area Networks (VLANs) Part II Virtual Local Area Networks VLAN Trunking VLAN Trunking The concept of trunking began with the telephone industry. Multiple calls were moved between customers and central offices or between the offices themselves over a single physical connection. VLAN Trunking The same principle was applied to data communications to make better use of the communication line. Additional advantages and cost savings were gained by using the same line for voice communications. 24 Channel T1 Line with Data and Voice VLAN Trunking The same principle of trunking is applied to network switching technologies. A trunk is a physical and logical connection between two switches across which network traffic travels. No trunk Trunk VLAN Trunking It is also important to realize that a trunk link does not belong to a specific VLAN. The responsibility of a trunk link is to act as a conduit for VLANs. Between switches and routers. Between switches and switches. . | Chapter 3 Virtual Local Area Networks (VLANs) Part II Virtual Local Area Networks VLAN Trunking VLAN Trunking The concept of trunking began with the telephone industry. Multiple calls were moved between customers and central offices or between the offices themselves over a single physical connection. VLAN Trunking The same principle was applied to data communications to make better use of the communication line. Additional advantages and cost savings were gained by using the same line for voice communications. 24 Channel T1 Line with Data and Voice VLAN Trunking The same principle of trunking is applied to network switching technologies. A trunk is a physical and logical connection between two switches across which network traffic travels. No trunk Trunk VLAN Trunking It is also important to realize that a trunk link does not belong to a specific VLAN. The responsibility of a trunk link is to act as a conduit for VLANs. Between switches and routers. Between switches and switches. VLAN Trunks What problem does it solve? Network 172.17.10.0/24 Network 172.17.20.0/24 Network 172.17.99.0/24 Network 172.17.30.0/24 IEEE 802.1Q Frame Tagging Remember that switches are Layer 2 devices. Only use the Ethernet frame header information. Frame header does not contain information about VLAN membership. VLAN membership (i.e. VLAN ID or VLAN Number) must be identified for each frame that is transferred over the trunk. The process is called 802.1Q VLAN Tagging. IEEE 802.1Q Frame Tagging 6 6 2 1500 4 Destination Address Source Address Type / Length Data Max of 1500 Bytes FCS 6 6 2 2 2 1500 4 Destination Address Source Address 802.1Q Tag Type/ Length Data Max of 1500 Bytes New FCS 8100 Tag Length 1518 Bytes Length 1522 Bytes 6 6 2 2 2 1500 4 Destination Address Source Address 802.1Q Tag Type/ Length Data Max of 1500 Bytes New FCS 8100 Tag IEEE 802.1Q Frame Tagging Length 1522 Bytes 3 Bits 1 Bit 12 Bits User Priority CFI VLAN ID Canonical Format Identifier Native VLANs Tagged .
