Brocade Virtual ADX Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 313)

Brocade Virtual ADX Server Load Balancing Guide 297
53-1003247-01
Miscellaneous Layer 7 switching configurations
5
Layer 7 CSW pseudo stack server-side TCP packet
out-of-sequence handling
With the current Layer 7 Content Switching (CSW) pseudo stack, the Brocade Virtual ADX expects
all TCP packets from the server-side to arrive in-sequence. If the server-side TCP packets are
received out-of-sequence, the Brocade Virtual ADX will silently drop the out-of-sequence TCP
packets and then wait for either the TCP stack timeout to expire, or for the server to retransmit. If
this occurs, the end-user will experience slowness while browsing certain Web pages over the
Internet.
The Brocade Virtual ADX Layer 7 CSW pseudo stack supports handling of packet-drops and
out-of-sequence TCP packets arriving from server-side as well.
Displaying server-side link connections
In order to display information about the server-side out-of-sequence TCP packets handled by the
Brocade Virtual ADX, use the show server proxy keep-alive command. The statistics relevant to the
out-of-sequence TCP packets are shown (in bold) in the following abbreviated output and described
in
Table 34 .
Syntax: show server proxy keep-alive
NOTE
This command is available at the Brocade Virtual ADX BP console only.
Virtual ADX#show server proxy keep-alive
Keep-alive connection statistics:
Server-side statistics:
...
TCB status:
Total in mem = 512000 Current in pool = 0
Allocated from mem = 301 Freed to mem = 300
Allocated from pool = 0 Freed to pool = 0
...
Connection unreusable reasons:
Small window = 0 No rev sess = 0
Not reusable = 0 Fin/RST received = 0
Image = 0 = 0
Delayed ACK list status:
Total TCBs in list = 12 Curr TCBs in list = 0
Generated ack num = 0
Out of sequence packet buffering:
total stored oos pkt = 3 total freed oos pkt = 3
total timeout drop = 0 total oversize drop = 0
...
SYN_RECV = 0 WAIT_REQ = 0
NOT_COMPLETE = 0 REQ_STORED = 0
SYN_SENT = 0 REQ_SENT = 0
PAGE_REPLIED = 0 STATE_UNKNOWN = 0
...
KA DEBUG: URL_MULTI_STATE_FREED [ 31] = 113
...