discarded packets question

[jeff.arey]

We have a Cat 3508 (8 Gig ports SX) connected to 5 Cat 2950-48 port switches via their respective Gig uplinks via SX GBIC's over 50-u multi-mode fiber. Via the Web interface of the 3508, port stat's show a large number of "Total Discarded Packets" (each port has about 200,000 packets discarded). When I perform a "show interface Gig 0/1" for one of the same interfaces, discarded packets are not there- you may have deferrals, input errors, collisions, and others, but no number that equals the discard value. Any ideas as to what would cause large numbers of discarded packets?

[tsettle]

Does it match the number of transmit discards in following output or 'no dest' receive counters?

show controllers ethernet-controller gigabitEthernet 0/1

Is this a trunk port by any chance?

[jeff.arey]

Thanks for your reply. It is not a trunk port, pure switch to switch port with one VLAN. My customer is going to try the "show cont eth-cont" command and get that output to me. I'd forgotten that command, its quite a bit of data for transmit vs. recv.

Thanks.

[jeff.arey]

After clearing the counters on the Cat 3508 earlier this morning, we've accumulated about 600 Total Discards as viewed from the Web interface. Upon executing the "show controller eth-cont gig 0/1" we noticed that we have about 400 no dest rev unicast and about 200 no dest recv multicast. Am I to assume that these are the incoming packets being dropped from my closet 2950 switch uplinks, as this switch sort of serves as a distribution switch for the building? Is this sort of like an ICMP destination unreachable or similar?

Thanks in advance for any help.