Chapter 13 Spanning Tree Protocol
GS2210 Series User’s Guide
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13.8 Configure Multiple Spanning Tree Protocol
To configur e MSTP, click M STP in t he Adv a n ce d Applica t ion > Spa n n in g Tr e e Pr ot ocol scr een.
See
for m or e infor m at ion on MSTP.
For war ding Delay
( second)
This is t he t im e ( in seconds) t he r oot sw it ch w ill wait befor e changing st at es ( t hat is,
list ening t o lear ning t o for war ding) .
Note: The listening state does not exist in RSTP.
Cost t o Br idge
This is t he pat h cost from t he r oot por t on t his Sw it ch t o t he r oot sw it ch.
Port I D
This is t he pr ior it y and num ber of t he por t on t he Sw it ch t hr ough w hich t his Sw it ch m ust
com m unicat e w it h t he r oot of t he Spanning Tr ee.
Topology Changed
Tim es
This is t he num ber of t im es t he spanning t r ee has been r econfigured.
Tim e Since Last
Change
This is t he t im e since t he spanning t r ee w as last r econfigur ed.
Port
This field display s t he num ber of t he por t on t he Sw it ch.
Port St at e
This field display s t he por t st at e in STP.
•
D isca r din g - The por t does not for war d/ pr ocess r eceived fram es or lear n MAC
addr esses, but st ill list ens for BPDUs.
•
Le a r n in g - The por t lear ns MAC addr esses and pr ocesses BPDUs, but does not
for war d fram es yet .
•
For w a r din g - The por t is operat ing nor m ally. I t lear ns MAC addr esses, pr ocesses
BPDUs and for wards r eceived fram es.
Port Role
This field display s t he r ole of t he por t in STP.
•
Root - A for war ding por t on a non- r oot br idge, w hich has t he low est pat h cost and is
t he best por t fr om t he non- r oot br idge t o t he r oot br idge. A r oot br idge does not have
a r oot por t .
•
D e sign a t e d - A forwar ding por t on t he designat ed br idge for each connect ed LAN
segm ent . A designat ed br idge has t he low est pat h cost t o t he r oot br idge am ong t he
br idges connect ed t o t he LAN segm ent . All t he por t s on a root br idge ( r oot sw it ch) ar e
designat ed por t s.
•
Alt e r n a t e - A blocked por t , w hich has a best alt er nat e pat h t o t he root br idge. This
pat h is differ ent fr om using t he r oot por t . The por t m oves t o t he for war ding st at e
w hen t he designat ed por t for t he LAN segm ent fails.
•
Ba ck u p - A blocked por t , w hich has a backup/ r edundant pat h t o a LAN segm ent
w her e a designat ed por t is alr eady connect ed w hen a sw it ch has t w o link s t o t he
sam e LAN segm ent .
•
D isa ble d - Not st r ict ly par t of STP. The por t can be disabled m anually.
Designat ed Br idge
I D
This field display s t he ident ifier of t he designat ed br idge t o w hich t his por t belongs w hen
t he por t is a designat ed por t . Ot herw ise, it displays t he ident ifier of t he designat ed br idge
for t he LAN segm ent t o w hich t his por t is connect ed.
Designat ed Por t
I D
This field displays t he pr ior it y and num ber of t he br idge por t ( on t he designat ed br idge) ,
t hr ough w hich t he designat ed br idge t ransm it s t he st or ed configurat ion m essages.
Designat ed Cost
This field display s t he pat h cost t o t he LAN segm ent t o w hich t he por t is connect ed w hen
t he por t is a designat ed port . Ot her w ise, it display s t he pat h cost t o t he r oot br idge fr om
t he designat ed por t for t he LAN segam ent t o w hich t his port is connect ed,
Root Guar d St at e
This field display s t he st at e of t he por t on w hich root guar d is enabled.
•
Root - in con sist e n t - t he Sw it ch r eceives superior BPDUs on t he por t and block s t he
por t .
•
For w a r din g - t he Sw it ch unbolck s and allow s t he por t t o for war d fram es again.
Table 52
Advanced Applicat ion > Spanning Tr ee Pr ot ocol > St at us: MRSTP ( cont inued)
LABEL
DESCRIPTION
