Handbook

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High availability
Introduction
Switches support high availability network topologies. This release provides information about Uplink
Failure Detection and Virtual Router Redundancy Protocol (VRRP).
Uplink Failure Detection
Uplink Failure Detection (UFD) is designed to support Network Adapter Teaming on the CPU Blades.
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 23 Uplink Failure Detection for switches
CPU Blade
1 2
NIC
Layer2/3
Switch
Layer2/3
Switch
CPU Blade
1 2
NIC
CPU Blade
1 2
NIC
10Gb
Intelligent
Switch 1
10Gb
Intelligent
Switch 2
LtD
LtD
LtM LtM
Failure Detection Pair Failure Detection Pair
NOTE: The port numbers specified in these illustrations may not directly correspond to the physical
port configuration of your system.