Nortel Networks 10BASE-T Uživatelský manuál stáhnout pdf (Strana 66)

Using the BayStack 410-24T 10BASE-T Switch

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309985-C Rev 00

• You can downline upgrade the entire stack from any switch in the stack.

• You can access and manage the stack using a TELNET connection or any

generic SNMP management tool through any switch port that is part of the

stack configuration.

• When stacking three or more switches, use the longer (1-meter) cascade

max-return cable (PN 303979-A) to complete the link from the last unit in the

stack to the base unit.

Redundant Cascade Stacking Feature

BayStack 410-24T switches allow you to connect up to eight units into a

redundant cascade stack. If any single unit fails or if a cable is accidently

disconnected, other units in the stack remain operational, without interruption.

Figure 1-15

shows an example of how a stack configuration reacts to a failed or

powered-down unit in the stack configuration:

As shown in Figure 1-15, unit 3 becomes nonoperational.

This can be the result of a failed unit, or simply because the unit was powered

down.

Unit 2 and unit 4, directly upstream and downstream from unit 3, sense the

loss of link signals from unit 3.

Units 2 and 4 automatically loop their internal stack signals (A and B).

The Cas Up LED for unit 2 and the Cas Dwn LED for unit 4 turn on

(yellow) to indicate that the stack signals are looped.

The remaining stack units remain connected.

Although the example shown in Figure 1-15

shows a failed unit causing the stack

to loop signals at the points of failure (A and B), the system reacts the same way if

a cable is removed.

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Nortel Networks 10BASE-T Uživatelský manuál Strana 66