The following describes spanning tree implementation, as shown in Figure 11-3.Īs shown in Figure 11-3, STP/RSTP is deployed on SwitchA and SwitchB, and VBST is deployed on SwitchC and SwitchD. When a VBST-enabled device connects to an STP-enabled device, the VBST-enabled device uses standard STP BPDUs in VLAN1 and VBST BPDUs with the Data field of STP BPDUs in other VLANs to exchange with the STP-enabled device.When a VBST-enabled device connects to an RSTP-enabled device, the VBST-enabled device uses standard RSTP BPDUs in VLAN1 and VBST BPDUs with the Data field of RSTP BPDUs in other VLANs to exchange with the RSTP-enabled device.To implement interworking between VBST and standard STP/RSTP, take the following measures: VBST and STP/RSTP use different BPDU formats, so there are interworking problems. On a live network, VBST-enabled devices may connect to STP/RSTP-enabled devices. ![]() ![]() Interworking Between VBST and Standard STP/RSTP
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