Brocade Communications Systems ServerIron ADX 12.4.00 - Manual (Page 199)

ServerIron ADX Global Server Load Balancing Guide 187
53-1002437-01
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 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:
• 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.