3-3
Figure 3-3 The structure of a BPDU packet after it enters a BPDU tunnel
To prevent the devices in the service provider network from processing the tunnel packets as other
protocol packets, the MAC address of a tunnel packet must be a multicast address uniquely assigned to
the BPDU tunnel in the service provider network.
BPDU Tunnel Configuration
You can establish BPDU tunnels between S3100 series Ethernet switches for the packets 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 remote control), and HABP (Huawei
authentication bypass protocol)
z Proprietary protocols of other vendors, including CDP (CISCO discovery protocol), PAGP (port
aggregation protocol), PVST (per-VLAN spanning tree), VTP (VLAN trunk protocol), and UDLD
(uni-directional link discovery)
Configuration Prerequisites
The edge devices can communicate with the user devices properly.
Configuring a BPDU Tunnel
Follow these steps to configure a BPDU tunnel:
To do... Use the command... Remarks
Enter system view
system-view
—
Configure a private multicast
MAC address for packets
transmitted along the tunnel
bpdu-tunnel tunnel-dmac
mac-address
Optional
By default, the destination MAC
address for packets transmitted
along a BPDU tunnel is
010f-e200-0003.
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