A10E/A28E/A28F Configuration Guide
MSTP mode: the A10E/A28E sends MST BPDU. If the peer device runs STP, the local
interface is switched to STP compatible mode. If the peer device runs MSTP, the local
interface remains in RSTP mode, and process packets as external information of domain.
Configure the A10E/A28E as below.
Enter global configuration mode.
Alpha-A28E(config)#spanning-tree
mode { stp | rstp | mstp }
Configure spanning tree mode.
7.5.15 Configuring link type
The point-to-point link connected interface can quickly changes to forward status by
transmitting synchronization packet. By default, MSTP set interface link type according to
duplex mode. Full-duplex interface is considered as point-to-point link, half-duplex interface
is considered as shared link.
You can configure current Ethernet interface to connect point-to-point link by force, but it
will go wrong if the link is not point-to-point. Generally, user had better set this item in auto
status and the system will automatically detect whether the interface is connected to point-to-
point link.
Configure link type for the A10E/A28E as below.
Enter global configuration mode.
Alpha-A28E(config)#interface port
port-id
Enter physical layer interface
configuration mode.
Alpha-A28E(config-port)#spanning-
tree link-type { auto | point-to-
point | shared }
Configure link type for interface.
7.5.16 Configuring root interface protection
Network will select bridge again when it receives packet from higher priority, which will
influent network connectivity and also consume CPU resource. For MSTP network, if
someone sends higher priority BPDU packets, the network may become unstable for the
continuous election. Generally, each bridge priority has already configured in network
programming. The nearer to edge, the lower the bridge priority is. So the down-bound
interface cannot receive the packets higher than bridge priority only if someone attacks. For
these interfaces, user can enable rootguard function to refuse to deal with packet higher than
bridge priority and meanwhile block the interface for a period to prevent other attacks from
attack source to damage the upper layer link.
Configure root interface protection for the A10E/A28E as below.
Enter global configuration mode.
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