User guide

17-32 E
XTREME
W
ARE
S
OFTWARE
U
SER
G
UIDE
S
ERVER
L
OAD
B
ALANCING
(SLB)
3DNS S
UPPORT
When you enable SLB, the switch reports health status to 3DNS using the iQuery
™
protocol from F5 Networks
®
. The health status of the nodes within the server farm is
based on L3, L4, L7, or external health checker mechanisms.
A
DVANCED
SLB C
OMMANDS
Table 17-4 describes advanced SLB commands.
Table 17-4: Advanced SLB Commands
Command Description
clear slb vip [<vipname> | all] persistence Resets all connection information in the
persistence table. New connections opened
are directed to a new server.
config slb 3dns-encryption-key {encrypted} <key> Configures the encryption key for the
IQuery protocol. The key can contain up to
100 characters.
config slb failover failback-now Configures the local SLB to release the
remote SLB resources if the remote SLB is
alive.
config slb failover ping-check ipaddress
<ipaddress> {frequency <seconds> timeout
<seconds>}
Configures the SLB device to actively
determine if an external gateway is
reachable by performing a ping. If the
external gateway is not reachable, the VIPs
failover to the remote SLB device. Specify
the following:
■
ipaddress — The IP address of the
external gateway.
■
frequency — The interval, in seconds,
between pings sent to the remote
gateway. The default setting is 1
second.
■
timeout — The amount of time before
the local device declares the remote
gateway is not reachable. The default
setting is 3 seconds.