3Com 3C17203 - SuperStack 3 Switch 4400, Implementation Manual

Page: 24 / 153

24 C
HAPTER
1: S
WITCH
F
EATURES
O
VERVIEW
■
The configuration can only be restored onto a device or stack which
has the same physical connections and configuration, including
expansion modules, as when the configuration was initially saved. The
restore operation will be unsuccessful if the physical configuration of
the device or stack is different.
■
The configuration of the Switch must only be restored or saved by a
single user at a time. The
system summary
CLI command displays the
progress of restore and save operations to all other users.
■
When using the Configuration Save and Restore feature, 3Com
recommends that aggregated links are configured as either:
■
Manual aggregations with Link Aggregation Configuration
Protocol (LACP) disabled on the ports that are to be manually
placed in the aggregated link.
or
■
LACP automatic aggregations — that is, LACP enabled on all ports
and the aggregated links created automatically. The aggregated
link should be enabled and Spanning Tree Protocol enabled.
Parameters such as VLANs and Fast Start may be set up as required.
Other combinations of port settings, however, are not recommended
as Configuration Restore will only perform a “best effort” restore of
the configuration. For example, LACP automatic aggregations with
manually defined ports are restored as manual aggregations with
manual ports. LACP automatic aggregations with automatic ports
where the aggregated link is disabled and Spanning Tree Protocol is
disabled are restored as manual aggregations with the aggregated link
disabled.
For further information about LACP, see Chapter 2 “Optimizing
Bandwidth” .
■
When restoring a configuration onto a unit over an aggregated link,
communication with that unit may be lost because the restore
operation disables the aggregated link ports. Communication over the
aggregated links is re-established when the restore operation has
been completed.
■
When RADIUS is set as the authentication system mode for the Switch
and the configuration is saved, the shared secret (password) is not
saved and the system mode is saved as local. You must either edit the
saved configuration text file prior to restoring it, or reconfigure the