The screenshot above shows when the EPC capture is stopped. The screenshot above shows the EPC capture starting. monitor capture cap1 interface g1/0/8 both The screenshot above occurred when an interface was attached to the capture point. Yes, I realize that the below is an EPC command, not Wireshark, and this may be confusing since the debug output clearly says Wireshark, but be assured this is EPC. The screenshot above occurs when a new capture is created and an access-list is applied to the capture point. This debug produces much more useful information. The screenshot above shows the debug output when the EPC is stopped. The screenshot above shows the debug output when the EPC is started. There are only two debugs that I am aware of. Monitor capture cap1 export location flash:/cap1.pcap monitor capture cap1 export flash:/cap1.pcap Monitor capture cap1 match ipv4 protocol tcp any any eq 22 Please take note that it works without ever going into configure mode. Monitor capture cap1 interface g1/0/1 both Capturing BGP traffic from the control plane is sometimes better than trying to capture it at the interface level. Real-Life Capture Examples Capture BGP Traffic You can use some really complex Wireshark display filters, you just need to know the syntax! Sh monitor capture capname buffer display-filter "ip.addr=10.20.30.40 & !tcp.port=443" Sh monitor capture capname buffer display-filter "ip.addr=10.20.30.40" Show monitor capture capname buffer detailed After adding the expand command you will see this show monitor command is actually a macro for a show platform command. Network admins can verify this command is a Wireshark command by adding the following to the config terminal exec prompt expand. Show monitor capture capname buffer brief
#WIRESHARK COMMANDS MAC#
After the file is exported it can be copied to remote TFTP, FTP, etc.Ĭonfigures a core filter based on MAC address, IP version (4or6), host, IP Subnet, ports, protocols etc. Use this when the destination is a file on local flash. pcap file on local flash, or remote tftp, ftp etc.
Clearing the buffer is a destructive action, export it first if you need it.Įxports the captured traffic from the buffer to a. Wireshark IOS XE Commands monitor capture bufferĬonfigures a fixed buffer size or circular option.Ĭlears the buffer while the capture is active or stopped. Wireshark on IOS XE exports packets to a well know file format. Wireshark on IOS XE presents information in a text-based user interface, this text interface is also known as tshark. Wireshark is a packet analyzer program that supports multiple protocols. Use this command to capture packets that fit into a size range. Monitor capture (interface / control plane)Ĭonfigures limits like duration (time), packet length (size), or a total number of packets. Use this command to attach an access-list to a capture point. Note: It's possible not all these commands will be available on your platform. Note: The command references show the Wireshark vs EPC commands. Configuration takes place in EXEC mode, not in config mode. Capturing packets that are handled by the CPU (outside the data plane) is performed by attaching the capture to the control plane. EPC allows network administrators to capture data packets flowing through, to, and from a Cisco device and has been in IOS \ IOS XE for many years. Using filters to capture specific traffic can reduce CPU and memory utilization.Įmbedded Packet Capture is a toolset that actually captures the traffic.
Please be aware of typical CPU & memory usage before enabling these features. Wireshark on IOS XE is also a method of capturing and displaying traffic in IOS XE, however, Wireshark is much more flexible when it comes to working with the captured traffic and displaying the captured traffic on the CLI.įinally, both Wireshark and Embedded Packet Capture can be CPU and Memory intensive processes. In summary, Embedded Packet Capture is a method of capturing and displaying traffic in IOS XE. This article is to help network administrators differentiate between Wireshark and EPC and to show examples of both methods.
#WIRESHARK COMMANDS LICENSE#
Wireshark requires a DNA Advantage term license and EPC requires a Network Essentials perpetual license, this has created confusion.
Some monitor capture commands in IOS XE use Wireshark others use EPC. SPAN is another way of redirecting traffic to a monitoring destination but has no local display, this article is NOT about SPAN. Wireshark can also be an application that runs as a container on C9300 and C9400, this article is NOT about that. Wireshark is an application that runs natively inside of IOS XE on the Cat 9k. Wireshark and Embedded Packet Capture (EPC) are methods of capturing and or displaying captured traffic on an IOS XE box.
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