Fast EtherHub 3500 System User’s Guide
3-4 Setting Up Network Connections
Port Backup Function
The Fast EtherHub 3500 system supports a port backup
function (i.e., a redundant link). A hub system can have up to
18 pairs of redundant links. These links are configurable using
the in-band or out-of-band management program. When a
primary link fails, the secondary (i.e., backup) link
automatically takes over.
Notes: 1. To prevent traffic from looping, the primary port is enabled and the
backup port disabled. If the system is functioning normally, the Link
indicator for the primary port and the Partition indicator for the
backup port will be on.
2. It is common practice to attach these links to the same physical
device (e.g., two separate adapter cards on a critical server).
However, to provide more flexibility, this is not enforced by the
configuration program.
Security Features
Intrusion Protection
Any repeater port on the hub can be configured with a preferred
source address. If an unauthorized intruder is detected, the
network management station can be notified, or a trap can be
sent and the port disabled.