udf-modify
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-modify name
|
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
History Command introduced in Version 2.5.3.
Usage Use this command to modify customized fields for vFlow configurations.
Examples To modify a UDF, u1, offset 10, length 4, and header packet-start, use the following syntax:
CLI network-admin@switch > udf-modify name u1 offset 10 length 4 header packet-start