Intel IXP400 manual Managed Objects for Ethernet Receive, Object Increment Criteria

Intel® IXP400 Software

Access-Layer Components: Ethernet Access (IxEthAcc) API

•IxEthAccMibIIStatsGet() — Returns the statistics maintained for a port

•IxEthAccMibIIStatsGetClear() — Returns and clears the statistics maintained for a port

•IxEthAccMibIIStatsClear() — Clears the statistics maintained for a port

Table 23. Managed Objects for Ethernet Receive

Object	Increment Criteria
dot3StatsAlignmentErrors	RFC-2665 definition
dot3StatsFCSErrors	RFC-2665 definition
dot3StatsInternalMacReceiveErrors	RMII_FRM_ALN_ERROR XTRA_BYTE LEN_ERR
	RX_LATE_COLL (MII_FRM_ALN_ERR && !FCS_ERR)
	Received frames dropped because either the internal buffering
RxOverrunDiscards	capability of the NPE has been overrun (possibly because
	insufficient free IX_OSAL_MBUFs were available).
RxLearnedEntryDiscards	Received frame dropped due to MAC destination address filtering.
RxLargeFramesDiscards	Received frames dropped by the frame size filtering service.
RxSTPBlockedDiscards	Received frame dropped by the spanning tree port blocking service.
RxVLANTypeFilterDiscards	Received frame dropped by the VLAN ingress acceptable frame
	type filtering service.
RxVLANIdFilterDiscards	Received frame dropped by the VLAN ingress filtering service.
RxInvalidSourceDiscards	Received frames dropped by the invalid source MAC address
	filtering firewall service.
RxBlackListDiscards	Received frames dropped by the MAC address blocking firewall
	service.
RxWhiteListDiscards	Received frames dropped by the MAC address admission firewall
	service.
	Received frame dropped due to replenishing starvation.
	An Underflow Discard occurs when the Ethernet Rx Free Queue
	becomes empty. When the NPE receives an Ethernet frame it looks
	to the “Rx Free” queue to find an empty buffer where it can place the
	incoming Ethernet packet. If no buffer is available (i.e., the queue is
RxUnderflowEntryDiscards	empty) then the NPE drops the packet.
	To troubleshoot this problem, ensure the
	ixEthAccPortRxFreeReplenish is providing enough empty buffers to
	the Ethernet Rx Free Queue. Possible root causes of replenish
	starvation can be that this function is either not getting the CPU time
	to execute with sufficient frequency, or buffers in the system are not
	being recycled in an efficient manner to allow the Rx Free queue
	replenishment to occur.

Programmer’s Guide	IXP400 Software Version 2.0	April 2005
	Document Number: 252539, Revision: 007	153