Nortel Ethernet Routing Switch 4500 series stacking
59
•
The Cascade Down LED for Unit 2 and the Cascade Up LED for Unit
4 turn amber to indicate an error.
•
The remaining stack units remain connected and continue to operate.
Replacing or adding a stack unit
To replace a failed stack unit or insert a new unit into a stack, perform
this procedure.
ATTENTION
Automatic Unit Replacement (AUR) for both configuration and software is enabled
for all Nortel Ethernet Routing Switch 4500 Series platforms and software
releases. This means that the agent code image, on a replacement unit, is
automatically upgraded or downgraded to match the software running on the
stack. In addition, when a like-for-like replacement of a failed unit occurs, any
port-specific configuration is restored .
Step
Action
1
Remove the failed switch from the stack.
2
Obtain a like-for-like replacement switch.
3
With the new unit powered off, physically insert the new unit in the
stack and reconnect the stack cables.
4
Turn on the new unit.
Depending on the software load on the replacement switch, it may
automatically reboot one or two times before joining the stack as a
fully operational member.
5
Check the log file on the stack to ensure that the replacement unit
correctly joined the stack. The log file displays AUR information
messages.
—End—
If the base unit is being replaced, remember that the stack has elected
a temporary base unit and the new unit does not automatically assume
the base unit status. Configure the new unit as the base unit, using the
Unit Select switch, and reset the Unit Select switches of the other stack
members to non-base units.
Nortel Ethernet Routing Switch 4500 Series
Installation Guide
NN47205-300 (322811-B)
03.01
Standard
5.1
19 November 2007
Copyright © 2007, Nortel Networks
.
