ZyXEL Communications GS3700 Series User Manual page 144

The following t able describes t he labels in t his screen.
Table 60 Advanced Applicat ion > Spanning Tree Prot ocol > MRSTP
LABEL DESCRIPTION
St at us Click St a t us t o display t he M RSTP St a t u s screen ( see
Tree This is a read only index num ber of t he STP t rees.
Act ive Select t his check box t o act ivat e an STP t ree. Clear t his checkbox t o disable an STP t ree.
Note: You must also activate Multiple Rapid Spanning Tree in the Advanced Application
Bridge Priorit y Bridge priorit y is used in det erm ining t he root swit ch, root port and designat ed port . The
swit ch wit h t he highest priorit y ( lowest num eric value) becom es t he STP root swit ch. I f all
swit ches have t he sam e priorit y, t he swit ch wit h t he lowest MAC address will t hen becom e
t he root swit ch. Select a value from t he drop- down list box.
The lower t he num eric value you assign, t he higher t he priorit y for t his bridge.
Bridge Priorit y det erm ines t he root bridge, which in t urn det erm ines Hello Tim e, Max Age
and Forwarding Delay.
Hello Tim e This is t he t im e int erval in seconds bet ween BPDU ( Bridge Prot ocol Dat a Unit s)
configurat ion m essage generat ions by t he root swit ch. The allow ed range is 1 t o 10
seconds.
Max Age This is t he m axim um t im e ( in seconds) a swit ch can wait wit hout receiving a BPDU before
at t em pt ing t o reconfigure. All swit ch port s ( except for designat ed port s) should receive
BPDUs at regular int ervals. Any port t hat ages out STP inform at ion ( provided in t he last
BPDU) becom es t he designat ed port for t he at t ached LAN. I f it is a root port , a new root
port is select ed from am ong t he Swit ch port s at t ached t o t he net work. The allowed range
is 6 t o 40 seconds.
Forwarding Delay This is t he m axim um t im e ( in seconds) a swit ch will wait before changing st at es. This
delay is required because every swit ch m ust receive inform at ion about t opology changes
before it st art s t o forward fram es. I n addit ion, each port needs t im e t o list en for
conflict ing inform at ion t hat would m ake it ret urn t o a blocking st at e; ot herwise,
t em porary dat a loops m ight result . The allow ed range is 4 t o 30 seconds.
As a general rule:
Note: 2 * (Forward Delay - 1) >= Max Age >= 2 * (Hello Time + 1)
Slot ( St acking This field appears only in st acking m ode. Click t he drop- down list t o choose t he slot
m ode) num ber of t he Swit ch in a st ack.
Port ( St andalone This field displays t he port num ber. I n st acking m ode, t he first box field is t he slot I D and
or st acking t he second field is t he port num ber.
m ode)
* Set t ings in t his row apply t o all port s.
Use t his row only if you want t o m ake som e set t ings t he sam e for all port s. Use t his row
first t o set t he com m on set t ings and t hen m ake adj ust m ent s on a port- by- port basis.
Note: Changes in this row are copied to all the ports as soon as you make them.
Act ive Select t his check box t o act ivat e STP on t his port .
Edge Select t his check box t o configure a port as an edge port when it is direct ly at t ached t o a
com put er. An edge port changes it s init ial STP port st at e from blocking st at e t o forwarding
st at e im m ediat ely wit hout going t hrough list ening and learning st at es right aft er t he port
is configured as an edge port or when it s link st at us changes.
Note: An edge port becomes a non-edge port as soon as it receives a Bridge Protocol Data
Chapter 11 Spanning Tree Protocol
> Spanning Tree Protocol > Configuration screen to enable MRSTP on the Switch.
Unit (BPDU).
GS3700/XGS3700 Series User's Guide
144
Figure 99 on page 145) .