Installation and Reference Guide HP AdvanceStack 100Base-THub-12TX, Hub-12TXM, and Switch Modules 1997-06

HP Hub-12TX/Hub-12TXM Installation and Reference Guide
3-4 Setting Up Network Connections
Backup Links Function
The AdvanceStack Hub-12TX/Hub-12TXM system supports a
backup link function (i.e., a redundant link), provided a Hub-
12TXM is included in the stack. A hub system can have up to
10 pairs of Backup Links. These links are configurable using
the VT-100 console interface. When a primary link fails, the
backup (i.e., secondary) link automatically takes over. To
configure Backup Links, go to the Backup Links menu in the
VT-100 console interface for the Hub 12-TXM.
Notes:
1. To prevent traffic from looping, the primary port is enabled and the
backup link port disabled. If the system is functioning normally, the
Link indicator for the primary port and the Partition indicator for the
backup link 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
VT-100 console interface.
Security Features
Intrusion Protection
Any port on the hub can be configured with an authorized
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.