Operation Manual – VLAN-VPNH3C S5600 Series Ethernet Switches Chapter 3 BPDU Tunnel Configuration3-3tunnel here acts as a local link for user devices. It enables Layer 2 protocols to runon a virtual local network.Figure 3-2 and Figure 3-3 show the structure of a BPDU packet before and after it entera BPDU tunnel.Destination MAC address (Specified by protocol)0 31BPDU DataSource MAC address15FCSFigure 3-2 The structure of a BPDU packet before it enters a BPDU tunnelDestination MAC address (Private Multicast Address)0 31BPDU DataSource MAC address15FCSFigure 3-3 The structure of a BPDU packet after it enters a BPDU tunnelCaution:To prevent the devices in the service provider network from processing the tunnelpackets as other protocol packets, the MAC address of a tunnel packet must be amulticast address uniquely assigned to the BPDU tunnel in the service providernetwork.3.2 BPDU Tunnel ConfigurationYou can establish BPDU tunnels between S5600 series Ethernet switches for thepackets of the following protocols:z LACP (link aggregation control protocol)z STP (spanning tree protocol)z HGMP-related protocols, including: NDP (neighbor discovery protocol), NTDP(neighbor topology discovery protocol), cluster MRC (cluster member remotecontrol), and HABP (Huawei authentication bypass protocol)
