Supermicro SuperBlade SBM-GEM-X2C+, Руководство пользователя

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6-31
Chapter 6: 1-Gb Ethernet Switch Firmware
6-14 UpLink Failure Tracking (ULFT)
Uplink Failure Tracking (ULFT) feature is provided to support network adapter Teaming
(Windows Systems) or Channel Bonding (Linux Systems) on SuperBlade servers.
Installing two GbE switch modules can have additional connectivity to allow increased
network bandwidth, redundancy, and/or fault tolerance. The connection between
internal ports of the switch and each LAN port of the server blades is hardwired through
the middle plane. The link will not be dropped unless either switch's internal port or the
server blade's LAN port fails.
By enabling the ULFT feature with proper pair configuration, a failover event can be
triggered in the Teaming or Channel Bonding program when all of a switch's external
uplink member ports fail. The switch automatically enables the internal downlink ports
once one of the uplink ports in the configured pair returns to service.
To use ULFT, you must configure a Failure Tracking Pair and enable the ULFT feature.
A Failure Tracking Pair consists of uplink and downlink ports. The uplink tracking
member contains at least one of the external ports: port 1 to port 10. The downlink
tracking member contains at least one of the internal ports: port 11 to port 24.
If Trunking is enabled on the external uplink ports, then all of the trunk member ports
should be configured as uplink members of a tracking pair. The link to the configured
internal downlink member ports is disabled when
all of the trunking uplink member ports
fail. Figure 6-22 shows the U
PLINK
F
AILURE
T
RACKING
C
ONFIGURATION
screen. Table 6-9
describes each configuration item.
For example, if your SuperBlade has two blade servers installed on slot 1 and slot
3,then each blade has two LAN ports, one connected to the internal port of the upper
GbE switch and the other one connected to the internal port of the bottom GbE switch.
To implement switch redundancy, you need to have two GbE switches installed. Each of
these GbE switches should enable the UpLink Failure Tracking feature and have the
exact same proper configuration as shown in
Figure 6-22 .
The pair configuration in this example defines the ULFT for blade 1 and blade 3. The
external port 5 of each switch is connected to an external third party switch through an
Ethernet cable. This assumes that the Network Adapter Teaming or Channel Bonding
has a proper configuration and is running on each of the blades.
If one of the external Ethernet cables is broken or the third party switch port to which the
cable connects fails, then one of the SuperBlade GbE switches will detect a link drop on
its external port 5 and turn down the link on its internal ports 11 and 13. The Teaming or
Channel Bonding software running on both of these blades then detects a link drop on
one of its LAN ports and switches to another LAN port automatically. This allows
network traffic to go through another GbE switch.
NOTE: By dafault, the switch’s ULFT feature is disabled. The link status on the
external uplink ports does not affect the link status of internal downlink ports.