High availability 140
High availability
Introduction
Switches support high availability network topologies. This release provides information about Uplink Failure
Detection and Virtual Router Redundancy Protocol (VRRP). VRRP is available only on the GbE2c Layer 2/3 Ethernet
Blade Switch.
Uplink Failure Detection
Uplink Failure Detection (UFD) is designed to support Network Adapter Teaming on HP server blades. For details
about Network Adapter Teaming on HP ProLiant server blades, see the white paper at the following location:
http://h18004.www1.hp.com/products/servers/networking/whitepapers.html.
UFD allows the switch to monitor specific uplink ports to detect link failures. When the switch detects a link failure, it
automatically disables specific downlink ports. The corresponding server’s network adapter can detect the disabled
downlink, and trigger a network-adapter failover to another port on the switch, or another switch in the chassis.
The switch automatically enables the downlink ports when the uplink returns to service.
The following figure shows a basic UFD configuration, with a Failure Detection Pair (FDP) that consists of one LtM
(Link to Monitor) and one LtD (Link to Disable). When the switch detects a link failure in the LtM, it disables the ports in
the LtD. The server blade detects the disabled downlink port, which triggers a NIC failover.
Figure 24 Uplink Failure Detection for switches
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