Allied Telesis x900-48 series Manual de funciones - Página 13

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Command output

Profile #1:

IPv4 bytes used ......... 3 of 16

Other-Eth bytes used .... 5 of 16

Device Resource, device #1:

Number of rules used ........ 1

Rule space usage ............ 8

Number of rules per application:

Accel. Card(IPv6) ......... 1

Device rule space limit ... 1024

Profile Usage:

Profile #1:

IPv4 bytes used ......... 0 of 16

Other-Eth bytes used .... 6 of 16

Appendix A: How to use the layer 4 mask in classifiers

This section describes the use of L4 mask in classifiers and gives some examples on L4 masks.

The way that L4 masks work is similar to IP subnet masks. You need to be familiar with the

binary system to set the right mask for your need.

The L4 mask is a 2-byte hexadecimal number, the base-16 number system, which consists of

16 unique symbols: the numbers 0 to 9 and the letters A to F.

For example, if we want to set our UDP destination port to 2000:

2000

The default mask

Applying a L4 mask to an UDP/TCP port allows you to identify the constant and variable

parts of the port number. The constant bits are represented by the 1s in the mask, and the

variable bits are represented by the 0s. Performing a bitwise logical AND operation between

the port number and the L4 mask results in the first port number of the range.

Note:

Let's look at some examples.

Page 13 | AlliedWare™ OS How To Note: Hardware Filters

The logical AND operation compares 2 bits and if they are both "1", then the result

is "1", otherwise, the result is "0".

Appendix A: How to use the layer 4 mask in classifiers

Description

Profile used to match on packets

Number of bytes being used in the profile for matching

IPv4 packets

Number of bytes being used in the profile for matching

non-IPv4 ethernet packets

Resources used by device number 2 - accelerator card

1 default rule in the IPv6 card

One 8-rule block has been allocated in the rule table on

the accelerator card

Splitting the rule allocation out on a per-application basis

1 default IPv6 rule

Total number of rules in the rule table on the accelerator

card

Profile used to match on packets

Number of bytes being used in the profile for matching

IPv4 packets

Number of bytes being used in the profile for matching

non-IPv4 ethernet packets

11111010000 (in binary)

07D0 (in hexadecimal)

FF FF

which is 11111111 11111111 (in binary)