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Catalyst 4500 CPU Packet Buffer Parser

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Tool available at: https://cway.cisco.com/tools/cat4k_cpu_pkt_to_pcap/

Catalyst 4500 CPU Packet Buffer Parser

   The Catalyst 4500 CPU Packet Buffer Parser tool converts the output of 'show platform cpu packet buffered' from a Catalyst 4500/4900 platform into a PCAP file and provides L2 and L3 statistics.

Description

The Catalyst 4500 CPU Packet Buffer Parser tool converts the output of 'show platform cpu packet buffered' from a Catalyst 4500/4900 platform running IOS or IOS-XE into a PCAP file (that can be analyzed with WireShark) and provides L2 and L3 statistics including:

   * Top Talkers

   * Detailed Counters per L2/L3 packet field

Cat4500 CPU Packet Buffer Parser Features:

   * Outputs including fields in both decimal (older IOS) and hex (IOS-XE) outputs.

   * Multiple cpu packet buffer captures in the same file

 * Supported frames and packets:

     IP, ARP, CDP, dot1q, STP BPDU and VSL frames.

Use Cases

The Cat4500 CPU Packet Buffer Parser is commonly used when troubleshooting any of the following issues on Catalyst 4500/4900 switches:

  • High CPU utilization, which could happen in Campus Networks due to various reasons including:
    • Spanning Tree instability due to misconfigured hosts, misbehaved hosts, L1 problems
    • Worm/Virus causing affecting stations to burst traffic to the network or DoS attacks
    • ARP or Broadcast storms.
    • Multicast streams.
  • Hosts not able to reach a destination upstream.

Tool Developers:

* Ryan Bolenbaugh - High Touch Engineer, FTS

* Alejandro Eguiarte - Technical Leader, Services

Guidelines:

When using the Catalyst 4500 CPU Packet Buffer Parser tool on CCO or at the development site you just need to drag & drop a text file containing the output of `show platform cpu packet buffered` and click Run.

cat4k_run_tz.jpg

 

Here is a sample output of the script:

 cat4k_results_1_tz.jpg

Expanded statistics per frame/packet field:

cat4k_results_2_tz.jpg

Feedback

Your feedback is valuable to help us improve the tool. Please do not hesitate in adding a comment using the icon in the upper right corner of this page.