Brocade Network OS Command Reference v4.1.0 Manuale Utente Scaricare il pdf (Pagina 96)

58 Network OS Command Reference

53-1003115-01

capture packet interface

Enables the capture of packet information on an interface, for display on the switch itself or for

storage in an automatically generated file.

Synopsis capture packet {interface} {all | fortygigabitethernet rbridge-id/slot/port | gigabitethernet

rbridge-id/slot/port | tengigabitethernet rbridge-id/slot/port} {direction {both | rx | tx} {filter {l2 |

l3 | all}

Operands interface Selects an interface (required).

all Selects all interfaces.

fortygigabitethernet Selects a 40-GbE interface.

gigabitethernet Selects a 1-GbE interface.

tengigabitethernet Selects a 10-GbE interface.

rbridge-id/slot/port

Selects the RBridge ID, slot, and port of the respective interface.

direction Selects a direction (required).

both Selects traffic in both transmit and receive directions.

rx Selects received traffic.

tx Selects transmitted traffic.

filter Selects the packet types to be filtered (required).

l2 Filters only Layer 2 packets to the CPU.

l3 Filters only Layer 3 packets to the CPU.

all Filters all packets to the CPU, including transit packets if an access control

list (ACL) is enabled (Refer to the Usage Guidelines.)

Defaults None

Command Modes Privileged EXEC mode

Description Use this command to capture packet information on an interface. This can provide significant help

in debugging, especially for Layer 2 TRILL and Layer 3 packets. Captured packets are stored in a

circular buffer, and they are also written to an automatically generated “pktcapture.pcap” file,

which can store up to 1500 K of data in flash memory (the equivalent of approximately 10k

packets, each having an average size of 100 bytes). Once this file is full, it is saved at *_old.pcap

and data are written to a new pktcapture.pcap file. These files can be exported and viewed

through a packet analyzer such as Wireshark.

NOTE

Up to 100 packets per interface can be captured. Once the buffer is filled, the oldest packets are

replaced with the most recent.

Usage Guidelines This command is supported in VCS and standalone modes. This command can be entered on any

RBridge in a Brocade VCS Fabric.

To disable packet capture globally, use the no capture packet all command.

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Brocade Network OS Command Reference v4.1.0 Manuale Utente Pagina 96