How To Fix Cisco Overflow Error?

How To Fix Cisco Overflow Error?

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    Recently, some of our users have reported a cisco overflow error. Ingress overruns occur when a router cannot process incoming data traffic and therefore drops packets.

    Presentation

    cisco overrun error

    This article describes the “Overflow” error as well as showingbut how to fix performance issues or packet loss issues on all networks. An administrator may notice errors that are reported in the control output of the show interface on the Adaptive Security Appliance (ASA).

    Background

    Requirements

    Component Document To Use

    What are overruns on a network?

    Overflow matters why there is a FIFO overflow caused by the rate at which the buffer fills up and no core can clear it. Finally, things like unintentional VLAN tags or receiving IPv6 frames when an interface is not specifically configured for IPv6 have been removed.

    This is not supported by certain software and Universal Serial Bus versions.

    The information in this document was created by creating devices in the same lab environment. All technologies used in this document started with a cleared (default) configuration. If you know the network is active, make sure you understand the potential consequences that indicate the command.

    Problem

    The ASA Client Interface Overflow Error Count keeps track of the number of times a packet a was received on the network interface, but there was no free space next to the interface’s FIFO queue to store the packet on the Internet. So the stock is gone. The value of this panel can be seen using the demo commandinterface.

    ASA# shows interface GigabitEthernet0/1GigabitEthernet0/1 interface "inside", active, line protocol can be active  Hardware i82546GB definitely rev03, BW 1000Mbps, DLY ten µsFull-Duplex, 1000 Mbps (1000 Mbps)Incoming flow control does not need to be maintained, outgoing flow control is effectively disabled.MAC address 0026.0b31.0c59, MTU 1500IP information 10.0.0.113, subnet mask 255.255.0.0580757 incoming packets, 86470156 bytes, 0 no bufferReceived 3713 voice messages, 0 short, 0 giant2881 port error, 0 CRC, 0 frames, 2881 overflow, 0 skipped, 0 aborted0 temporarily stop input, 0 continue input0 drops decryption L2905828 packets sent, 1131702216 bytes, 7 errors0 pause output, 0 program output0 exit error, 0 collision, 0 port reset0 late collision, 0 delayed0 idea reset failures, 0 reset exit failures, 0 TX hangsFree Entry Queue (PSU/Low): Hardware (255/230)Free Output Queue (Current Blocking/Low): Hardware (255/202)

    cisco overrun error

    In the example shown here, there were 2881 overflows on the current interface Since the ASA was started, or since the interactive clear command to manually fine-tune the counters.

    Interface Overflow Reasons

    What are overrun errors?

    An overflow is a wide range of times when the receiver hardware is unable to transmit received data stored in a hardware buffer. This often occurs when the rate of incoming traffic associated with the traffic exceeds the recipient’s ability to actually process the data.

    What causes overrun packet?

    The overflow can be due to congestion (such as the different packets per second you see in Wireshark) or due to issues with the general network card hardware or operating system interrupt handling (caused sufficient by the driver).

    Interface overflow errors are often caused by a combination of the following:

  • Software level. ASA packets are not fast enough to remove non-interface packets from the FIFO queue. This causes the FIFO queue to fill up and new packets to be dropped.
  • The hardware level. The rate at which packets arrive on the interface is too high, which usually causes the FIFO queue to fill up before the ASA software can drop the packets. Typically, a directed burst burst will cause the FIFO string to fill up quickly.
  • Interface Overflow Troubleshooting Steps

    1. Determine if the ASA is experiencing CPU overload and if they can exacerbate the problem. We are working on ways to reduce prolonged or frequent CPU usage.
    2. Understand interface speed traffic and see if the ASA is oversubscribed with a traffic profile.
    3. Set intermittentth mode if the problem occurs due to bursts of traffic. If so, implement control flow on that particular ASA interface and adjacent switch ports.

    Possible Causes And Solutions

    The CPU On The ASA Is Intermittently Too Busy To Process Incoming Packets (CPU Hogs)

    The ASA platform manages all software packages and uses critical CPU cores that perform all course functions (such as syslogs, Adaptive Security Device Manager connectivity, and application validation) to process incoming packages. If the software interrupts processing on the main CPU for longer than it should, the ASA logs this as a new CPU overload event because the process has “occupied” the CPU. The CPU usage threshold is set in milliseconds and is simply different for each hardware model. The threshold depends on the time required to fill the distributed FIFO interface queue, the CPU power of the coin rig, and the potential traffic switching rate that the device can withstand.

    CPU overloads cause internal overflow errors Cases up to single-core processors such as 5505, 5510, 5520, 5540 and 5550. Particularly long overloads lasting 1 millisecond or more can cause congestion, especially with relatively low levels of car traffic and non-explosive traffic rates. This issue does not affect multi-core consoles as much, since other cores will definitely receive packets from the Rx ring if one of the CPU cores is busy with the process.

    A threshold that lasts longer than my device’s threshold will generate a syslog with ID 711004 to help you, as shown here:

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  • 6. 14:40:42 Feb: 2013 %ASA-4-711004: Task ran for 60ms, process=ssh, pc=90b0155, call stack=6 2:40:42 pm Feb: 2013 %ASA-4-711004 : task was performed for the process = 50 ms SSH, PC is 90B0155, Call Stack = 0x090B0155 0x090BF3B6 0x090B3B84 0x090B3F6E 0x090B4459 0x090B44D6 0x08CA090BCCCAD6D 0x08CA0 0x80FAD6D 0x080efa5a 0x080F0A1C 0x0806922C

    CPU consumption events will continue to be logged by the system. The output of show proc cpu-hog demand shows the following fields:

  • Process: The name of the process that was in turn using the CPU.
  • PROC_PC_TOTAL is the total amountThere are many cases where the CPU of this process was very busy.
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