ZyXEL Communications GS3700 Series User Manual page 156

Table 64 Advanced Applicat ion > Spanning Tree Prot ocol > St at us: MSTP ( cont inued)
LABEL DESCRIPTION
Port St at e This field displays t he port st at e in STP .
• D isca r din g - The port does not forward/ process received fram es or learn MAC
addresses, but st ill list ens for BPDUs.
• Le a r n in g - The port learns MAC addresses and processes BPDUs, but does not
forward fram es yet .
• For w a r din g - The port is operat ing norm ally. I t learns MAC addresses, processes
BPDUs and forwards received fram es.
Port Role This field displays t he role of t he port in STP .
• Root - A forwarding port on a non- root bridge, which has t he lowest pat h cost and is
t he best port from t he non- root bridge t o t he root bridge. A root bridge does not have
a root port .
• D e sign a t e d - A forwarding port on t he designat ed bridge for each connect ed LAN
segm ent . A designat ed bridge has t he lowest pat h cost t o t he root bridge am ong t he
bridges connect ed t o t he LAN segm ent . All t he port s on a root bridge ( root swit ch) are
designat ed port s.
• Alt e r n a t e - A blocked port , which has a best alt ernat e pat h t o t he root bridge. This
pat h is different from using t he root port . The port m oves t o t he forwarding st at e
when t he designat ed port for t he LAN segm ent fails.
• Ba ck up - A blocked port , which has a backup/ redundant pat h t o a LAN segm ent
where a designat ed port is already connect ed when a swit ch has t wo links t o t he
sam e LAN segm ent .
• D isa ble d - Not st rict ly part of STP . The port can be disabled m anually.
Designat ed Bridge This field displays t he ident ifier of t he designat ed bridge t o which t his port belongs when
I D t he port is a designat ed port . Ot herwise, it displays t he ident ifier of t he designat ed bridge
for t he LAN segm ent t o which t his port is connect ed.
Designat ed Port This field displays t he priorit y and num ber of t he bridge port ( on t he designat ed bridge) ,
I D t hrough which t he designat ed bridge t ransm it s t he st ored configurat ion m essages.
Designat ed Cost This field displays t he pat h cost t o t he LAN segm ent t o which t he port is connect ed when
t he port is a designat ed port . Ot herwise, it displays t he pat h cost t o t he root bridge from
t he designat ed port for t he LAN segam ent t o which t his port is connect ed.
Root Guard St at e This field displays t he st at e of t he port on which root guard is enabled.
( St andalone
• Root - inconsist ent - t he Swit ch receives superior BPDUs on t he port and blocks t he
m ode)
port .
• For w a r din g - t he Swit ch unbolcks and allows t he port t o forward fram es again.
Chapter 11 Spanning Tree Protocol
GS3700/XGS3700 Series User's Guide
156