Allied-telesis AT-S60 Instrukcja Użytkownika Pobierz pdf (Strona 684)

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Chapter 39: STP, RSTP, and MSTP

Section VI: Web Browser Management 684

All bridges in a single-instance bridged LAN use this aging time to

test the age of stored configuration messages called bridge

protocol data units (BPDUs). For example, if you use the default of

20, all bridges delete current configuration messages after 20

seconds. The range of this parameter is from 6 to 40 seconds. The

default is 20 seconds.

In selecting a value for maximum age, the following must be

observed:

MaxAge must be less then (2 x (HelloTime + 1))

MaxAge must be less then (2 x (ForwardingDelay - 1))

Bridge Max Hops

MSTP regions use this parameter to discard BPDUs. The Max Hop

counter in a BPDU is decremented every time the BPDU crosses an

MSTP region boundary. Once the counter reaches zero, the BPDU

is deleted.

Revision Level

The revision level of an MSTP region. This is an arbitrary number

that you assign to a region. The revision level must be the same on

all bridges in a region. Different regions can have the same

revision level without conflict. The range is 0 (zero) to 255.

9. Click Apply.

To save your changes, return to the General Tab and click Save

Changes. The changes you made are saved on the switch. Or,

proceed to the next procedure to configure the CIST priority.

Configuring the

CIST Priority

To configure the CIST priority, perform the following procedure:

1. Display the Spanning Tree Expanded Page for MSTP by performing

Steps 1 through 4 in the procedure Configuring MSTP Parameters on

page 681.

2. In the Configure CIST Parameters section, set the CIST Priority, the

priority number for the bridge.

This number is used to determine the root bridge of the bridged

network. This number is analogous to the RSTP bridge priority

value. The bridge in the network with the lowest priority number

is selected as the root bridge. If two or more bridges have the

same bridge or CIST priority values, the bridge with the

numerically lowest MAC address becomes the root bridge.

3. Click Apply.

To save your changes, return to the General Tab and click Save

Changes. The changes you made are saved on the switch.

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