Huawei S1700 Series Web User Manual page 73

S1700 Managed Series Ethernet Switches
Web User Manual
Item
Protection Type
Edge
Point to Point
Path Cost
Issue 05 (2012-10-25)
Description
The options for whether to 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.
"force-true" specifies ports as edge ports. The edge ports connect
directly to terminal, affecting no network‟s connectivity, thus getting
quickly into Forwarding status. When edge ports receiving
configuration message (BPDU Message), the system will automatically
set these ports as non-edge ports and calculate spanning tree, causing
network‟s topology oscillation.
Force-true: it represents point to point sharing link. Point to point port is
similar to edge port, but point to point mode must be full duplex mode.
As the edge port, point to point port can quickly turn into forwarding
status to obtain RSTP advantages.
Force-false: it represents this interface does not own point to point
status.
auto: it represents that interface will change into point to point status
whenever it is possible, like status of point to point is "force-true". If the
interface cannot maintain this status, (like interface is forced operating
half duplex mode), the point to point status will be changed, like status
of point to point is "force-false". This parameter default is set as "auto".
Cost of this interface to CIST root path.
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