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A given domain name can be associated with multiple health check TCP or UDP ports. In that case,
the GSLB ServerIron ADX considers an IP address to be active only if all its associated TCP and UDP
ports pass their health checks.
State transitions of individual ports are determined as a part of the health check procedure.
However, state transitions for IP addresses are detected during GSLB decision making (when the
GSLB ServerIron ADX is processing a DNS response or when you display zone information). In these
cases, health check status changes affect the GSLB decisions.
Syslog messages
By default, the ServerIron ADX's syslog buffer is enabled and contains up to 50 entries. To display
the GSLB and other syslog messages, enter the following command at any level of the CLI.
ServerIronADX> show logging
Syslog logging: enabled (0 messages dropped, 0 flushes, 0 overruns)
Dynamic Log Buffer (50 entries):
00d00h01m28s:N:L4 gslb health-check 209.157.22.210 of brocade.com status changed
to up
00d00h01m28s:N:L4 gslb health-check 209.157.22.209 of brocade.com status changed
to up
00d00h01m01s:I:Interface ethernet16, state up
00d00h01m01s:I:Interface ethernet2, state up
00d00h00m34s:N:L4 gslb health-check 209.157.22.210 of brocade.com port 80 is up
00d00h00m32s:N:L4 gslb health-check 209.157.22.209 of brocade.com port 80 is up
00d00h00m32s:N:L4 server 209.157.23.59 kandrew TCP port 80 is up
00d00h00m32s:N:L4 server 209.157.23.59 kandrew is up
00d00h00m31s:N:L4 gslb connection to site sunnyvale ServerIronADX 209.157.22.210
slb-2 is up
00d00h00m31s:N:L4 gslb connection to site sunnyvale ServerIronADX 209.157.22.209
slb-1 is up
00d00h00m31s:I:Bridge topology change, vlan 1, interface 16, changed state to
forwarding
00d00h00m07s:N:L4 server 209.157.23.130 dns-ivy TCP port 53 is up
00d00h00m07s:N:L4 server 209.157.23.130 dns-ivy is up
00d00h00m06s:I:Bridge topology change, vlan 1, interface 2, changed state to
forwarding
00d00h00m03s:I:Bridge root changed, vlan 1, new root ID 800000e0520002d1, root
interface 16
00d00h00m00s:I:Warm start
Syntax: show logging
In this example, the GSLB messages are shown in bold type. The GSLB messages in this example
all apply to the ServerIron ADXs at the Sunnyvale site. Three types of messages are shown:
•
•
ServerIron ADX Global Server Load Balancing Guide
53-1002437-01
Buffer logging: level ACDMEINW, 16 messages logged
level code: A=alert C=critical D=debugging M=emergency E=error
I=informational N=notification W=warning
The first two GSLB messages are shown nearest the bottom, since new messages appear at
the top. These two messages indicate that the GSLB ServerIron ADX has established a GSLB
protocol connection to the site ServerIron ADXs (slb-1 at 209.157.22.209 and slb-2 at
209.157.22.210).
The next two GSLB messages indicate that the Layer 4 health checks for TCP port 80 were
completed successfully. For sites with other applications, the ServerIron ADX sends separate
Layer 4 TCP or UDP health checks for each of those applications.
SNMP traps and syslog messages
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