Enabling Single-Port Loop Detection - H3C S9500 Series Operation Manual

Operation Manual – MSTP
H3C S9500 Series Routing Switches
Caution:
It is recommended that after enabling STP, you disable the broadcasting function of
BPDU to prevent the BPDU packets, which are received by ports that did not
participate in the generation of spanning trees, from being forwarded to other ports,
(which can cause errors during STP generations). Avoid using this function on
VPLS-enabled LPUs so that STP packets can be forwarded in the VPLS network
transparently.
After you use the stp enable command in system view, the system automatically
runs the stp non-flooding command; after you use the stp disable command in
system view, the system automatically runs the undo stp non-flooding command.

1.2.20 Enabling Single-Port Loop Detection

The common loop detection function cannot find out a downstream loop if the switch
has only one port connected to the downstream loop. But the STP single-port loop
detection can detect this kind of downstream loop and shut down the detected port
causing the loop.
Table 1-33 Enable the STP single-port loop detection function
Enter system view
Enter Ethernet port view
Enable the STP
single-port loop detection
function
Caution:
When such a downstream loop occurs, the STP single-port loop detection function
can detect the loop and shut down the port causing the loop.
When a loop is eliminated on a port, you need to bring up the port manually.
If both single-port loop detection and inner loop are configured on a port, the port will
be set to the discarding state.
To do...
system-view
interface interface-type
interface-number
stp loop-detection
Use the command...
1-35
Chapter 1 MSTP Configuration
Remarks
—
—
By default, the STP loop
detection function is
disabled.