SNMP traps and syslog messages | 1 |
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) 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
Dynamic Log Buffer (50 entries):
00d00h01m28s:N:L4 gslb
00d00h01m28s:N:L4 gslb
00d00h01m01s:I:Interface ethernet16, state up 00d00h01m01s:I:Interface ethernet2, state up
00d00h00m34s:N:L4 gslb
00d00h00m31s:N:L4 gslb connection to site sunnyvale ServerIronADX 209.157.22.210
00d00h00m31s:N:L4 gslb connection to site sunnyvale ServerIronADX 209.157.22.209
00d00h00m31s:I:Bridge topology change, vlan 1, interface 16, changed state to forwarding
00d00h00m07s:N:L4 server 209.157.23.130
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:
•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
•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.
ServerIron ADX Global Server Load Balancing Guide | 187 |
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