Server and application port states, Server states – Brocade Virtual ADX Server Load Balancing Guide (Supporting ADX v03.1.00) User Manual
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Brocade Virtual ADX Server Load Balancing Guide
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Server and application port states
4
Syntax: [no] tcp keepalive protocol TCP-port
The protocol TCP-port parameters specify the type of Layer 7 health you want to use for the port.
You can specify one of the following:
•
ftp or 21
•
imap4 or 143
•
ldap or 389
•
pop3 or 110
•
smtp or 25
•
telnet or 23
Configuring an unknown UDP port to use a Layer 7 health check
The Brocade Virtual ADX can perform Layer 7 health checks on the DNS port (UDP port 53).
To configure an unknown UDP port to use the DNS Layer 7 health check:
•
Configure the Layer 7 health check on the DNS port (53). For configuration information, refer to
“Configuring DNS health check method and values”
on page 179. The unknown port uses the
same health check parameters as the ones you configure for the DNS port. For example, if you
configure an address-based DNS health check for a specific domain name, the Brocade Virtual
ADX requests the same domain name when checking the health of the unknown port.
•
Create a port profile for the unknown port and specify dns or 53 as the well-known port whose
Layer 7 health check you want to use.
To configure an unknown port to use a Layer 7 health check, enter commands such as the
following.
Virtual ADX(config)#server port 999
Virtual ADX(config-port-999)#udp keepalive protocol dns
Syntax: server port UDP-portnum
Syntax: udp keepalive protocol UDP-portnum
The protocol UDP-port parameters specify the type of Layer 7 health you want to use for the port.
You can specify dns or 53.
Server and application port states
Server states
The server states only concern up to Layer 3. They do not deal with Layers 4 or Layer 7. In
,
Layer 2 reachability refers to ARPs, a Layer 2 query for Layer 3 information. Layer 3 reachability
refers to ICMP echo requests and replies, or pings.
NOTE
Layer 4 refers to making a TCP connection to a port. Layer 7 refers to making an HTTP request and
getting an HTTP reply.