Cisco Cisco FastHub 412M 10 100 Repeater Release Notes
3
Clearing the NVRAM of a Management Hub in a Redundant Stack
OL-1543-04
Usage Guidelines
Stacking Example
In a stack of hubs where hub 1 is the FastHub 400 M1 hub and hubs 2, 3, and 4 are FastHub 400
unmanaged hubs, these conditions apply:
unmanaged hubs, these conditions apply:
–
If you remove hub 3 and replace it with a new hub (hub A), the new hub keeps its default
configuration. (See
configuration. (See
–
If hub 4 is removed for troubleshooting purposes and later reinstalled in the second position in
the stack, the M1 hub recognizes the serial number of that hub as belonging to one of its saved
configurations and applies the previously saved hub 4 configuration. (See
the stack, the M1 hub recognizes the serial number of that hub as belonging to one of its saved
configurations and applies the previously saved hub 4 configuration. (See
.)
Clearing the NVRAM of a Management Hub in a Redundant Stack
To reset the nonvolatile random-access memory (NVRAM) configuration settings of one or both
management hubs in a redundant stack configuration, note the following guidelines.
management hubs in a redundant stack configuration, note the following guidelines.
Note
The primary management hub is referred to as the M1 hub. The secondary management hub is referred
to as the M2 hub.
to as the M2 hub.
•
When a second FastHub 400 managed hub is added to a stack, the new hub, referred to as the M2
hub, learns the saved configuration settings for the stack from the M1 hub. If the M1 hub fails, the
M2 hub uses the saved configuration of the M1 hub.
hub, learns the saved configuration settings for the stack from the M1 hub. If the M1 hub fails, the
M2 hub uses the saved configuration of the M1 hub.
Table 1
Original
Stack
Stack
Replaced
with
with
New Stack
Hub 1
Hub 1 (store M1)
Hub 2
Hub 2 (store 2)
(Hub 3) ----> Hub A ----> Hub 3 (store A: default)
Hub 4
Hub 4 (store 4)
Table 2
Original Stack Reinstalled New Stack
Hub 1
Hub 1 (store M1)
Hub 2 -------> Hub 4 ----> Hub 2 (store 4: saved)
Hub 3A ---->
Hub 3 (store 2: saved)
(Hub 4)
Hub 4 (store 3A: saved)