(Supporting ADX v03.1.00) Owner manual

Brocade Virtual ADX Server Load Balancing Guide 385
53-1003247-01
Displaying packet traffic statistics
B
Drops Number of packets dropped by the Brocade Virtual ADX. This statistic
includes the following:
• TCP Resets – Resets sent by the Brocade Virtual ADX
• Forward Resets – Resets from the client
• Unsuccessful requests – Requests sent to a TCP or UDP port that is
not bound to the request’s destination VIP
Aged Number of TCP and UDP sessions that the Brocade Virtual ADX closed
because they aged out. A session ages out when the age timer
configured on the Brocade Virtual ADX expires. For more information,
refer to “Configuring TCP age” on page 239 and “Configuring UDP age”
on page 239.
Fw_drops Number of client-to-server packets the Brocade Virtual ADX has
dropped. If this statistic is high, there might not be a session entry. This
scenario can occur under the following circumstances:
• If the session is terminated normally but the client sends another
RESET.
• If the maximum number of sessions has been reached.
• If all the real servers are down.
Rev_drops Number of server-to-client packets the Brocade Virtual ADX has
dropped. If this statistic is high, there might not be a session entry. This
can occur for the same reasons as listed for the Fw_drops field.
FIN_or_RST Number of FINs or RSTs passing through (forward and reverse) a
non-optimized path inside the Brocade Virtual ADX. All traffic is
optimized by default except FTP control, streaming protocol control, and
DNS traffic.
old-conn
fast vport found Number of successful virtual-port searches using an improved (faster)
method.
Duplicate SYN When the Brocade Virtual ADX receives a SYN packet for a session that
is already listed in the session table (show server sessions), the Brocade
Virtual ADX has received a Duplicate SYN. The counter is then
incremented by 1.
TCP ttl reset recvd Total (ttl) number of TCP resets received in both the forward and reverse
direction. This counter applies to both optimized (FPGA assisted) and
non optimized traffic paths.
Disable_drop Number of packets the Brocade Virtual ADX dropped because they were
sent by a client to a VIP port that is bound to a real server port that is
currently disabled.
Exceed_drop Number of packets dropped by the Brocade Virtual ADX because the TCP
SYN limit on the real servers had been reached. The TCP SYN limit is a
configurable parameter that allows you to protect servers against TCP
SYN attacks by limiting the number of TCP SYN requests the Brocade
Virtual ADX can send to the server each second.
For more information, refer to “Configuring the maximum number of
active sessions” on page 236.
Stale_drop Number of TCP SYN packets the Brocade Virtual ADX dropped because
they matched a stale session entry.
TABLE 45 Field descriptions for the show server traffic command (Continued)
Field Description