Operation Manual – MSTP
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 1
MSTP Configuration
1-13
Caution:
z Once you specify a switch as the root bridge or a secondary root bridge by using the
stp root primary or stp root secondary command, the bridge priority of the switch
cannot be configured any more.
z During the selection of the root bridge, if multiple switches have the same bridge
priority, the one with the smallest MAC address becomes the root bridge.
II. Configuration example
# Set the bridge priority of the current switch to 4,096 in spanning tree instance 1.
<H3C> system-view
[H3C] stp instance 1 priority 4096
1.2.5 Configuring the MSTP Packet Format
You can set the MSTP packet format to the following three formats for a port: auto,
legacy, and dot1s (802.1s).
z With the MSTP packet format set to auto, the port automatically determines the
format of the received MSTP packets (legacy or dot1s) and then decides the
format of packets to be transmitted, thus implementing communication with the
peer device. If the format of the received packets from the peer device changes
repeatedly, MSTP will shut down the corresponding port to prevent network storm.
A port shut down in this way can only be enabled again by the network
administrator after login.
z With the MSTP packet format set to legacy, the port processes and transmits only
MSTP packets in legacy format, thus implementing communication with the peer
device sending packets in legacy format. If packets in dot1s format are received,
the corresponding ports are set to the discarding state to prevent network storm.
z With the MSTP packet format set to dot1s, the port processes and transmits only
MSTP packets in dot1s format, thus implementing communication with the peer
device sending packets in dot1s format. If packets in legacy format are received,
the corresponding ports are set to the discarding state to prevent network storm.
z All the ports in an aggregation group use the same MSTP packet format.
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