Mstp Region - Huawei S1700 Series Web User Manual

S1700 Managed Series Ethernet Switches
Web User Manual
Item
Protection Type

5.5.4 MSTP Region

Click Service Management>STP>MSTP Region to view switch's domain information; the
configuration page is shown as the figure below.
Issue 05 (2012-10-25)
NOTE
When Eth-Trunk is used, the STP attribute of Eth-Trunk interface will follow the principles below:
1） If Eth-Trunk is created, the STP attribute of Eth-Trunk interface is set as default value;
2） If added to Eth-Trunk, the interface will be not displayed in STP interface list;
If removed from Eth-Trunk,the STP attribute of original interface will recover.
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Description
The options for whether enable corresponding protection on
interface are:
Root protection: Root protection function protects root
switch‟s location through maintaining specified port role.
Port configured to Root protection function, all of its port
value on instance is maintained as specified port. When a
port receives a higher priority BPDU, the port role won't
change into non-specified port; otherwise it changes into
detecting status, forwarding no message. In a long enough
periods, if a port receives no higher BPDU any more, the port
will recover to its previous normal status.
Loop circuit protection: On switch, status of root ports and
other blocking ports is maintained by continually receiving
BPDU from up streaming switch. When these ports receive
no BPDU from up streaming switch by causes of link
congestions or one-way link failures, the switch will select
root ports again. The previous root ports will turn to specified
ports and previous congestion ports will shift to forwarding
status, thus causing loop circuit in exchanging network. Loop
circuit protection function will restrain such occurrence.
When enabling loop circuit protection function, the root ports
will be set to blocking status if these ports can not receive
BPDU from upstream, while the blocking ports will remain
blocking status, forwarding no message and thus causing no
loop circuit in network.
TC protection:When switch receiving TC-BPDU, it will
implement delete operation of MAC address table and APR
table. If receiving frequently TC-BPDU to conduct table
delete action, it will be overburdened for the device. After
configuring topology change protection on interface, the
frequent delete operation can be avoided and the transmitting
TC-BPDU can be avoid as well.
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