It can’t handle any more packets, so the switch tries to queue them up. Transmit Discards indicate that packets were not transmitted because of network congestion. Transmit discards are *not* errors.The first fix is to stop using UDP for the transfer and use TCP for the window control. That is generally from the port queue’s filling up and tail dropping because it cannot transmit the data fast enough out the port. TX discards usually equates to output drops in Show interface.All broadcast traffic in that vlan will be discarded by the switch port. Once the VLANs were matched up, the discards stopped. The switch just “discards” the packets arriving on the missing VLAN. The port with the RX discards will be “missing” a VLAN as compared to the other end of the trunk. Check the Configured VLANs on each switch port. Rx discards could be faulty cabling, interface or NIC.“NoResourcesPktsDropped” on the other hand are generally caused by a switch that’s “low on/out of” buffer memory, so it will start dropping packets.“InDiscards”, are almost always caused by a port that is receiving tagged frames for a VLANID that that port is not a member of.
#Intermapper flows on cisco asr full#
the device lacks resources to do anything with the packet (such as full buffers).the device has been configured to discard certain traffic or.the device does not have a route to send the packet to the destination,.The causes can be many, including (but not limited to) the following: ARP Table Refresh ? MTU & Flow Control ? STP discards due to blocked topology ?.VLAN mismatch (check VLAN stats on both sides also)? L2 mismatch (Speed/Duplex) ? ACLs? QoS ?.Utilization on other end ? L2 stats ( dropped, Tx, Rx etc.).Average ? pattern (every x number of hours ?) Since when? Only during Peak or constant regardless of load ? what time frame is the discards for ?.Traffic Load ? CPU Load ? show logs ? Other L2 Errors ? Layer3 IP routing or ACL drops/discards as opposed to interface packet drops/discards (switch interfaces).What ports ? internal or external ? What device on the other end ?.What Switches/Models? What firmware versions? Look at the subsequent firmwares’ release notes for any identified issues, resolved caveats etc.They have been of help to me in the past on more than one occasion. The following list of questions/vectors can assist in troubleshooting Layer 2 discard issues.
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