H3C SOHO IE4300, Справочник по командам

Страница: 493 / 3296

28
Default
Dispute guard is enabled.
Views
System view
Predefined user roles
network-admin
Usage guidelines
Dispute guard blocks a port to prevent loops when a unidirectional link is detected on the port by the
spanning tree feature.
In some VLAN networks, an uplink port on a downstream device is configured to deny packets from
the PVID. As a result, the downstream device cannot receive BPDUs of the PVID from the upstream
device. However, the upstream device can receive BPDUs from the downstream device. In this case,
dispute guard blocks the receiving port on the upstream device, which causes traffic interruption.
To ensure service continuity and prevent the link from being blocked, you can disable dispute guard
by using the
undo stp dispute-protection
command.
Examples
# Disable dispute guard.
<Sysname> system-view
[Sysname] undo stp dispute-protection
stp edged-port
Use
stp edged-port
to configure a port as an edge port.
Use
undo stp edged-port
to restore the default.
Syntax
stp edged-port
undo stp edged-port
Default
All ports are non-edge ports.
Views
Layer 2 Ethernet interface view
Layer 2 aggregate interface view
Predefined user roles
network-admin
Usage guidelines
A port directly connecting to a user terminal rather than another device or a shared LAN segment can
be configured as an edge port. In case the network topology changes, an edge port does not cause
a temporary loop. You can enable the port to transit to the forwarding state rapidly by configuring it as
an edge port. As a best practice, configure ports that directly connect to user terminals as edge ports.
Typically, configuration BPDUs from other devices cannot reach an edge port, because the edge port
does not connect to any other device. When BPDU guard is disabled on a port configured as an edge
port, the port acts as a non-edge port if it receives configuration BPDUs.
On a port, the loop guard feature and the edge port setting are mutually exclusive.