The Cisco Device with RPVST+ and VSTP converge by specifying the native-vlan as VLAN 1. On a native-VLAN Cisco Device with RPVST+ configured sends BPDUs on the global multicast address (01:80:c2:00:00:00) and for all other tagged VLANs it sends it…
http://www.ebrahma.com/2014/01/rpvst-and-vstp-convergence-on-native-vlan-for-ex-switches/

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