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You are here: Home / 802.1D Spanning Tree Protocol – IEEE 802.1t and the Extended System ID

802.1D Spanning Tree Protocol – IEEE 802.1t and the Extended System ID

The 802.1t standard introduced the extended system ID to conserve MAC addresses while still allowing for a unique BID for each VLAN. In order to support extended VLANs, the Bridge Priority is reduced to a 4-bit value and a 12-bit Extended System ID field is added. STP then uses the extended system ID, the switch priority, and a single MAC address to make a unique BID for each VLAN. This is illustrated in Figure 3-14 below:

Fig. 3-14. 802.1t BID Composition

With extended system ID enabled, the Bridge . . .

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