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Alteon Web Switch Hardware Installation Guide
22
Chapter 2: Installing the Switch Hardware
212779-A, December 2001
Automatic Selection of Redundant Connections
NOTE – This feature is supported only on the Alteon 180 Series Web switches.
The Alteon 180 series’ unique dual-media configuration supports automatic bring-up and fail-
over between the 10/100 Mbps and 1000 Mbps port-pairs. Order of precedence follows these
rules:
n If both the 10/100 Mbps and 1000 Mbps ports are inactive:
If the user activates the Gigabit Ethernet port first (by plugging a live cable into the
SC-jack), the port immediately becomes active.
If the user activates the 10/100 Mbps port first, it remains inactive for a user-selectable
timeout (default 1.5 seconds). If the Gigabit Ethernet port is activated prior to the time-
out, it becomes the active port. Otherwise, the 10/100 Mbps port becomes active.
n If the active Gigabit Ethernet link fails, the 10/100 Mbps port will become the active port,
with minimally required software intervention.
n If the 10/100 Mbps link is active and the Gigabit Ethernet link becomes viable (either
because of a newly created connection or because of a repaired link), the 10/100 Mbps
link will remain active until one of the following conditions occurs:
The 10/100 Mbps link fails or is removed by the user.
The user forces the Gigabit Ethernet to become the active link from any management
interface.