Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

How to resolve "max_conn_overload" alarm from WAE-674 in WCCP mode?

I have a WAVE-574 and a WAE-674 showing the minor alarm "max_conn_overload: The TFO accelerator is overloaded (connection limit)". Both are running WCCP redirection.

From CM GUI > Dashboard > Device > Monitor > Traffic Analysis > Connection Statistics, one device showed 175 connections and the other showed 864 connections. The alarm seems to say there's a limit of # of connections the TFO accerelator can handle. But how can I find the limit on the device? Is it configurable? What is the best practice to resolve this overload?

I have searched Cisco web sites for possible explanations, but couldn't find any.

Thanks in advance.

Gary

4 REPLIES
Cisco Employee

Re: How to resolve "max_conn_overload" alarm from WAE-674 in WCC

Gary,

What version of WAAS are you running?

Thanks,

Dan

New Member

Re: How to resolve "max_conn_overload" alarm from WAE-674 in WCC

Hi Dan:

4.1.1c build 16 on all WAE and WAVE. All devices were ordered recently and shipped from Cisco within last a few weeks.

On the WAE, "sh statistics tfo" and "sh tfo detail" both show some numbers, but they don't seem to be corelated or match.

Thanks a lot

Gary

Cisco Employee

Re: How to resolve "max_conn_overload" alarm from WAE-674 in WCC

Gary,

There is a situation where routing loops can cause TFO overload and not show up in the stats (CSCsx68058). The stats/detection is fixed in 4.1.3, however the problems with routing loups still exist...

Look for errors in the syslog (opt_syn_rcv: Routing Loop

detected - Packet has our own devid. Packet dropped) or "sh stat TFO". See if you are seeing things like that which may be causing the TFO overload.

Dan

New Member

Re: How to resolve "max_conn_overload" alarm from WAE-674 in WCC

Hi Dan:

Thanks for the info. The TFO overload alarm was found on WCCP WAE and also Inline mode WAE. So probably not the routing loop issue. I looked at TFO stats, but not sure what numbers are good indications.

Can you take a look at the stats from the WCCP WAE-674?

Thanks a lot

Gary

WAE674-WCCP#sh stat tfo detail

Total number of connections : 10173

No. of active connections : 31

No. of pending (to be accepted) connections : 0

No. of bypass connections : 2216

No. of normal closed conns : 9587

No. of reset connections : 555

Socket write failure : 174

Socket read failure : 0

WAN socket close while waiting to write : 0

AO socket close while waiting to write : 0

WAN socket error close while waiting to read : 0

AO socket error close while waiting to read : 197

DRE decode failure : 0

DRE encode failure : 0

Connection init failure : 43

WAN socket unexpected close while waiting to read : 30

Exceeded maximum number of supported connections : 0

Buffer allocation or manipulation failed : 0

Peer received reset from end host : 106

DRE connection state out of sync : 0

Memory allocation failed for buffer heads : 0

Unoptimized packet received on optimized side : 5

Data buffer usages:

Used size: 0 B, B-size: 0 B, B-num: 0

Cloned size: 234 KB, B-size: 337 KB, B-num: 1230

Scheduler:

Queue Size: IO: 0, Semi-IO: 0, Non-IO: 0

Total Jobs: IO: 243894, Semi-IO: 215419, Non-IO: 29919

Policy Engine Statistics

-------------------------

Session timeouts: 0, Total timeouts: 0

Last keepalive received 00.1 Secs ago

Last registration occurred 7:22:30:06.9 Days:Hours:Mins:Secs ago

Hits: 4101731, Update Released: 67270

Active Connections: 2018, Completed Connections: 22638

Drops: 0

Rejected Connection Counts Due To: (Total: 4010359)

Not Registered : 0, Keepalive Timeout : 0

No License : 0, Load Level : 0

Connection Limit : 4010359, Rate Limit : 0

Minimum TFO : 0, Resource Manager : 0

Global Config : 0, TFO Overload : 0

Server-Side : 0, DM Deny : 0

No DM Accept : 0

Auto-Discovery Statistics

-------------------------

Connections queued for accept: 10146

Accept queue add failures: 0

AO discovery successful: 0

AO discovery failure: 0

639
Views
0
Helpful
4
Replies