Cisco Explorer 4700 Installation Guide Page 245

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Device Manager Guide, Cisco ACE 4700 Series Application Control Engine Appliance
OL-26645-02
Chapter 6 Configuring Real Servers and Server Farms
Configuring Health Monitoring
SIP-TCP Establishes a TCP connection and sends an OPTIONS request packet to the
user agent on the server. The ACE compares the response with the
configured response code or expected string, or both, to determine whether
the probe has succeeded. If you do not configure an expected status code,
any response from the server is marked as failed.
SIP-UDP Establishes a UDP connection and sends an OPTIONS request packet to the
user agent on the server. The ACE compares the response with the
configured response code or expected string, or both, to determine whether
the probe has succeeded. If you do not configure an expected status code,
any response from the server is marked as failed.
SMTP Initiates an SMTP session by logging into the server.
SNMP Establishes a UDP connection and sends a maximum of eight SMNP OID
queries to probe the server. The ACE weighs and averages the load
information that is retrieved and uses it as input to the least-loaded algorithm
for load-balancing decisions. If the retrieved value is within the configured
threshold, the server is marked as passed. If the threshold is exceeded, the
server is marked as failed.
TCP Initiates a TCP handshake and expects a response. By default, a successful
response causes the probe to mark the server as passed. The probe then sends
a FIN to end the session. If the response is not valid, or if there is no
response, the probe marks the real server as failed.
TELNET Establishes a connection to the real server and verifies that a greeting from
the application was received.
UDP Sends a UDP packet to a real server. The probe marks the server as failed
only if an ICMP Port Unreachable messages is returned.
VM Sends a probe to the VMware VM Controller to determine the average
amount of both CPU and memory usage of its associated local VMs. The
probe response determines whether the ACE load-balances traffic to the
local VMs only or bursts traffic to the remote VMs due to high usage of the
local VMs.
Note Use a VM probe when you configure the ACE for Dynamic
Workload Scaling (see the “Configuring Dynamic Workload
Scaling” section on page 6-14).
Table 6-9 Probe Types (continued)
Probe Type Description
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