The Brocade Virtual ADX selects a Layer 4 or Layer 7 health check based on whether the
application port is known to the Brocade Virtual ADX. A Layer 4 health check is a TCP or UDP
request and is not related to a specific application. A Layer 7 health check is an application-aware
health check designed for the specific application. The following application ports are known to the
Brocade Virtual ADX. The Brocade Virtual ADX performs Layer 7 health checks for these ports. For
other ports, the Brocade Virtual ADX performs a Layer 4 TCP or UDP health check instead.

•

FTP (port 21). Ports 20 and 21 both are FTP ports but on the Brocade Virtual ADX, the name
“FTP” corresponds to port 21.

•

HTTP (port 80)

•

IMAP4 (port 143)

•

LDAP (port 389)

•

MMS (port 1755)

•

NNTP (port 119)

•

PNM (port 7070)

•

POP3 (port 110)

•

RTSP (port 554)

•

SMTP (port 25)

•

SSL (port 443)

•

TELNET (port 23)

UDP ports include the following:

•

DNS (port 53)

•

RADIUS (port 1812)

•

RADIUS-OLD (port 1645), which is used in some older RADIUS implementations instead of port
1812

NOTE

You can add either port 1812 or port 1645 to a given real or virtual server, but you cannot add
both ports to the same server.

The keepalive health checks are disabled by default. To enable a keepalive health check for an
application port, configure a port profile for the port (which automatically enables the keepalive
globally for the port) or enable the keepalive on individual real servers that use the port.