Redundant Cascade Stacking Feature - Nortel BayStack 450 Using Manual

Using the BayStack 450 10/100/1000 Series Switch
• 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 450 switches allow you to connect up to 8 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 1-14
powered-down unit in the stack configuration:
As shown in
1.
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
2.
loss of link signals from unit 3.
a.
b.
The remaining stack units remain connected.
3.
Although the example shown in
to loop signals at the points of failure (A and B), the system reacts the same way if
a cable is removed.
1-30
shows an example of how a stack configuration reacts to a failed or
Figure 1-14, unit 3 becomes nonoperational.
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
(amber) to indicate that the stack signals are looped.
Figure 1-14 shows a failed unit causing the stack
302401-D Rev 00