Chapter 13 Spanning Tree Protocol
GS2210 Series User’s Guide
134
Hello Tim e
This is t he t im e int er val in seconds bet w een BPDU ( Bridge Pr ot ocol Dat a Unit s)
configurat ion m essage generat ions by t he r oot sw it ch. The allow ed range is 1 t o 10
seconds.
Max Age
This is t he m ax im um t im e ( in seconds) t he Sw it ch can w ait w it hout receiv ing a BPDU
befor e at t em pt ing t o r econfigur e. All Sw it ch port s ( except for designat ed por t s) should
r eceive BPDUs at r egular int er vals. Any por t t hat ages out STP inform at ion ( pr ov ided in
t he last BPDU) becom es t he designat ed por t for t he at t ached LAN. I f it is a r oot por t , a
new r oot por t is select ed fr om am ong t he Swit ch por t s at t ached t o t he net w or k . The
allow ed range is 6 t o 40 seconds.
For war ding Delay
This is t he m ax im um t im e ( in seconds) t he Sw it ch w ill wait befor e changing st at es. This
delay is r equir ed because ever y sw it ch m ust receive infor m at ion about t opology changes
befor e it st ar t s t o for war d fram es. I n addit ion, each por t needs t im e t o list en for
conflict ing infor m at ion t hat w ould m ake it r et ur n t o a block ing st at e; ot her w ise,
t em porar y dat a loops m ight r esult . The allow ed range is 4 t o 30 seconds. As a general
r ule:
Note: 2 * (Forward Delay - 1) >= Max Age >= 2 * (Hello Time + 1)
Maxim um hops
Ent er t he num ber of hops ( bet w een 1 and 255) in an MSTP r egion befor e t he BPDU is
discarded and t he por t infor m at ion is aged.
Configurat ion
Nam e
Ent er a descr ipt ive nam e ( up t o 32 charact er s) of an MST r egion.
Rev ision Num ber
Ent er a num ber t o ident ify a r egion’s configurat ion. Devices m ust have t he sam e r evision
num ber t o belong t o t he sam e r egion.
Apply
Click Apply t o save your changes t o t he Sw it ch’s r un- t im e m em or y. The Sw it ch loses
t hese changes if it is t ur ned off or loses pow er, so use t he Sa ve link on t he t op nav igat ion
panel t o save your changes t o t he non- volat ile m em or y w hen you ar e done configur ing.
Cancel
Click Ca n ce l t o begin configur ing t his scr een afr esh.
I nst ance
Use t his sect ion t o configur e MSTI ( Mult iple Spanning Tr ee I nst ance) set t ings.
I nst ance
Ent er t he num ber you w ant t o use t o ident ify t his MST inst ance on t he Sw it ch. The Sw it ch
suppor t s inst ance num ber s 0- 15.
Br idge Pr ior it y
Set t he pr iorit y of t he Sw it ch for t he specific spanning t r ee inst ance. The low er t he
num ber, t he m or e likely t he Sw it ch w ill be chosen as t he r oot br idge w it hin t he spanning
t ree inst ance.
Ent er pr ior it y values bet w een 0 and 61440 in incr em ent s of 4096 ( t hus valid values ar e
4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152,
53248, 57344 and 61440) .
VLAN Range
Ent er t he st ar t of t he VLAN I D range t hat you want t o add or r em ove fr om t he VLAN range
edit area in t he St a r t field. Ent er t he end of t he VLAN I D range t hat you want t o add or
r em ove fr om t he VLAN range edit ar ea in t he En d field.
Nex t click :
•
Ad d - t o add t his range of VLAN( s) t o be m apped t o t he MST inst ance.
•
Re m ov e - t o r em ove t his range of VLAN( s) fr om being m apped t o t he MST inst ance.
•
Cle a r - t o rem ove all VLAN( s) from being m apped t o t his MST inst ance.
Enabled VLAN( s)
This field display s w hich VLAN( s) ar e m apped t o t his MST inst ance.
Port
This field display s t he port num ber.
*
Set t ings in t his r ow apply t o all por t s.
Use t his r ow only if you want t o m ake som e set t ings t he sam e for all por t s. Use t his r ow
fir st t o set t he com m on set t ings and t hen m ake adj ust m ent s on a por t - by- por t basis.
Note: Changes in this row are copied to all the ports as soon as you make them.
Table 53
Advanced Applicat ion > Spanning Tr ee Pr ot ocol > MSTP ( cont inued)
LABEL
DESCRIPTION
