CISCO IOS XE EMBEDDED PACKET CAPTURE GENERATOR
CISCO IOS XE EMBEDDED PACKET CAPTURE SOFTWARE

In addition, export the capture in PCAP format for further analysis:.

Examine the capture in a detailed view:.

Monitor capture CAP match ipv4 protocol tcp any any The filter may be specified inline, or an ACL or class-map canВ be referenced: Monitor capture CAP interface GigabitEthernet0/0/1 both

Define the location where the capture will occur:.

The configuration of the capture is different than Cisco IOS as it adds more features. The Embedded Packet Capture feature was introduced in Cisco IOS-XE Release 3.7 - 15.2(4)S.

See Best Practices for searching Commands in order to obtain more information on the commands used in this section.

When the capture buffer is exported in PCAP format, L2 information (such as Ethernet encapsulation) is not preserved.

The capture point can be defined to capture only on an interface or globally.

The capture point can be defined to capture in the cef or process switching paths.

The capture configuration is not stored in NVRAM and will not persist through reloads.

The packet buffer is stored in DRAM and will not persist through reloads.

In releases earlier than Cisco IOS Release 15.0(1)M, the captured packet size was limited to 1024 bytes.

In releases earlier than Cisco IOS Release 15.0(1)M, the buffer size was limited to 512K.

No monitor capture point ip cef POINT fastEthernet 0 both

Once the necessary data has been collected, delete the 'capture point' and 'capture buffer':.

In such situations, you can take a copy of the hex dump and use any online hex-pcap convertor in order to view the files.

However the previous method is not always practical as it required T/FTP access to the router.

Tip: Enhancement request CSCuw77601 has been filed in order to add a mail-to option under export so you can email the buffer diretly to an email-id.

Export the buffer from the router for further analysis:.

In order to see them in human readable there are two ways. Note: This output only shows the hex dump of the packets captures. Monitor capture point associate POINT BUF

Attach the buffer to the capture point:.

Monitor capture point ip cef POINT fastEthernet 0 both The capture point also defines whether the capture occurs for IPv4 or IPv6 and in which switching path (process versus cef):

Define a 'capture point', which defines the location where the capture occurs.

Permit ip host 172.16.1.1 host 192.168.1.1 monitor capture buffer BUF filter access-list BUF-FILTER Define an Access Control List (ACL) within config mode and apply the filter to the buffer:

A filter can also be applied to limit the capture to desired traffic.

Monitor capture buffer BUF size 2048 max-size 1518 linear There are various options that can be selected when the buffer is defined such as size, maxium packet size, and circular/linear:

Define a 'capture buffer', which is a temporary buffer that the captured packets are stored within.

Cisco IOS Configuration Example Basic EPC Configuration

CISCO IOS XE EMBEDDED PACKET CAPTURE GENERATOR

The Packet Capture Config Generator and AnalyzerВ tool is available for Cisco CustomersВ to aid in the configuration, capture, and extraction of packet captures. As a result, the tool configuration is not stored within the router configuration and will not remain in place after a system reload. The tool is configured in exec mode and is considered a temporary assistance tool. In addition, the data can be exported as a packet capture (PCAP) file to allow for further examination. Once the data is captured, it can be examined in a summary or detailed view on the router. The packets are stored within a buffer in DRAM and are thus not persistent through a reload. When enabled, the router captures the packets sent and received.

If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from devices in a lab environment. Cisco IOS-XE Release 15.2(4)S - 3.7.0 or later.

CISCO IOS XE EMBEDDED PACKET CAPTURE SOFTWARE

The information in this document is based on these software and hardware versions: There are no specific requirements for this document. This document describes the Embedded Packet Capture (EPC) feature in Cisco IOS В® software.

Cisco ios xe embedded packet capture