A User Defined Field (UDF) can match up to 128 bytes of a packet starting from the first byte of the packet. The relative offset can be given to the match location. The length of the match can be from 1 to 4 bytes. Hardware with a Trident chip supports the creation of 8 UDF IDs. Each ID can match a 2 byte portion of a packet. Creating a UDF with a length of 3 or 4 bytes requires 2 UDF IDs whereas a UDF with length of 1 or 2 bytes required 1 UDF id. The length specified for each UDF determines the total number of UDFs supported by Netvisor. If you specify a length of 3 or 4 bytes, a maximum of 4 UDFs can be created. If you specify a length of 1 or 2 bytes, a maximum of 8 UDFs can be created.

Syntax   udf-show 

name name-string

Create the UDF name

scope local|fabric

Scope for the UDF

offset number-bytes

The offset in bytes. This is a value between 1, and 128.

length number-bytes

The length in bytes. This is a value between 1, and 4 bytes.

header packet-start|l3-outer|l3-inner|l4-outer|l4-inner

The header used to calculate the offset.

Defaults   None

Access   CLI


Version 2.5.3

Command introduced.

Usage   Use this command to display information about customized fields for vFlow configurations.

Examples  To display a UDF with scope local, offset 10, length 2, and header packet-start, use the following syntax:

CLI (network-admin@switch) > udf-show 

switch name  scope  offset length header

------ ----- ------ ------ ------ ------------

spine1 u1    local  20     4      packet-start 

spine1 u2    local  24     4      packet-start