Troubleshooting Drops Rx

[David Henderson_2]

This looks as if this could be a server issue.

If the server is being heavily utilised, then it will not be able to process the incoming packets.
This will cause the buffers to fill up, therefore the inbound packets will back up in the switch, hence the switch will drop the packets from the other inbound servers.

Can you check the server performance and receive buffers on the offending server during your slow database queries?

[Scott_111]

Ok, we installed an old 3Com 3300 10/100 switch and the slowness goes away. All the queries are now fast.

Before this, we fixed the port speeds on the switch and the NICs to 100FDx. The queries still ran slow.

Now I need to figure out if there is a problem with the HP switch? or do my clients have a problem with the HP switch?

[Scott_111]

Here is an update if anyone cares...

I am able to duplicate this using FTP. With all four machines connected to Gig ports, I FTP a large file from two machines to one machine. During the file transfer the Drops Rx counter on the "Status and Counters" screen increments for each sending port.

With all four machines connected to 10/100 ports and running at 100FDx, I FTP a large file from two machines to one machine. This time, during the file transfer, the Drops Rx counter does NOT increment.

[Ralph Bean_2]

Hello Scott -

You wrote "These 4 servers each have a gigabit connection to a gigabit port on a 20 port gigabit module in a 4108gl modular switch."

Are the 4 servers connected to the same 20-port module or to more than one 20-port module?

Regards,
Ralph

[Scott_111]

Ralph,

They are all connected to the same 20 port module. I have tried a different 20 port module and a 6 port module. They all produced the same results, drops.

Scott

[Ralph Bean_2]

Scott -

OK. And apart from the inter-server communications, is there traffic to or from these servers from other modules/blades on the Switch 4108gl?

Regards,
Ralph

[Scott_111]

Ralph,

These 4 ports/servers are only communicating to each other on the same module.

Scott

[Chris McFarling]

I've been experiencing similar problems. I have a 4108gl with 2 6-port Gb blades and 2 24-port 10/100 Mb blades. I have 2 Win2K Dell 1650 servers on Gb. I also have 2 Macintosh G4 (OS X 10.2.8) desktops on Gb. My problem is between these Mac G4s and the Win2K servers. Originally everything was 10/100. A few months ago I added the Gb blades. Since then the G4s that are connected via Gb drop off the network fairly often. It always happens when data is being transmitted from the desktop to the server (i.e. a file is being saved or a file is being copied). One of these G4s is on port B4. Digging around in the swith I came up with a couple points of interest. Here is the 1st screen output from the 'show interfaces' command (not sure if this will format correctly on this message board):

Status and Counters - Port Counters

Flow
Port Total Bytes Total Frames Errors Rx Drops Rx Ctrl
---- ------------ ------------ ------------ ------------ -----
A1 1,292,325... 3,332,360... 0 51,065 off
A2 3,030,993... 3,974,839... 0 5876 off
A3 3,469,065... 884,390,170 0 685,398 off
A4 2,032,024... 697,005,582 0 47 off
A5 43,325,123 1,503,198... 0 40,278 off
A6 2,936,419... 3,182,775... 0 718,075 off
B1 2,513,429... 567,435,320 0 210 off
B2 2,777,789... 156,003,895 0 836 off
B3 382,901,385 766,868,003 0 1037 off
B4 1,668,981... 753,116,057 0 1319 off
B5 717,844,295 731,313,675 0 590 off
B6 3,695,501... 816,902,831 0 601 off
G1 1,567,762 112,676,629 0 0 off
G2 3,083,163... 80,530,933 8 0 off
G3 2,682,579... 3,745,235... 0 0 off
G4 1,761,043... 1,291,843... 10 0 off
G5 4,253,146... 398,535,719 2 0 off

Basically, all of my Gb ports have some Drop Rx packets. A6 is up to 718,075. B4, where a problem Mac G4 is, is at 1349. All of the 10/100 ports are at zero. Additionaly I'm getting log entries like this:

I 01/17/91 22:20:11 ports: port B4 is now off-line
I 01/17/91 22:20:14 ports: port B4 is Blocked by LACP
I 01/17/91 22:20:17 ports: port B4 is now on-line
I 01/17/91 22:20:26 ports: port B4 is now off-line
I 01/17/91 22:20:56 ports: port B4 is Blocked by LACP
I 01/17/91 22:20:59 ports: port B4 is now on-line

I'm not sure what's going on here. I'm not using any trunking on this switch. All ports are set to LACP Passive.

Any ideas?

[SCOOTER]

Chris,

I have seen problems with MAC's with speeds(10/100/1000) before and turning off LACP and fixing the port and Nic's speed-duplex to 1000Fdx fixed the problem with the network drop-out.
Depending on what MAC you have you can fix the speed-duplex in the OS, if not then you need a speed-duplex tool (not supported by MAC but it works like a charm). If you need the tool send me an email (remove the * and NOSPAM ;)) Hope this helps a little,

NOSPAM*m*i*k*2*2*0*0*1*@hotmail.com

Regards,

SCOOTER