Discards on Nortel 450T Switch

[jthorne]

The ethernet ports on several of my Baystack 450T switches are experiencing high levels of discards but low utilisation. They have PC's hanging off them, with autonegociation disabled and they are fixed at 10Mb half duplex. The uplink ports are set to 100Mb full duplex but is not experiencing any discards.
Would anyone know the reason for these discards on the switch ports and how they can be avoided?

Thank you
Jenny

 

[jimbopalmer]

Port Statistics
Unit: [ 1 ] Port: [ 4 ]
Received Transmitted

Packets: 396044 Packets: 19713082
Multicasts: 0 Multicasts: 6468334
Broadcasts: 6193 Broadcasts: 8415229
Total Octets: 68472166 Total Octets: 2482304005
Lost Packets: 0 Lost Packets: 0
Packets 64 bytes: 191858 Packets 64 bytes: 11472124
65-127 bytes 43868 65-127 bytes 1616701
128-255 bytes 126299 128-255 bytes 5792201
256-511 bytes 13875 256-511 bytes 550917
512-1023 bytes 5864 512-1023 bytes 30093
1024-1518 bytes 14279 1024-1518 bytes 251046
Frame Errors: 0 Collisions: 0
Undersized Packets: 0 Single Collisions: 0
Oversized Packets: 0 Multiple Collisions: 0
Filtered Packets: 18434 Excessive Collisions: 0
Flooded Packets: 1404 Deferred Packets: 0
FCS Errors: 0 Late Collisions: 0


(sorry it lost a lot of formatting in the translation)

are the filtered packets the ones you are concered about?

if you have a hub connected to your Switch, and some traffic is local to the hub, then it will be filtered at the switch.

In fact, some programs may communicate to it's own subprocesses via TCP and that traffic will be filtered at the switch.

if the discards are in some other column, let's discuss!

(I rarely find any ethernet cards that do not like Nortel Switches, so Auto is fine about 23/24 of the time, I do lock down the fiber connections) I tried to remain child-like, all I acheived was childish.