How many filters can you create?

2. The profile (mask)

The other item is called the profile. Conceptually, this is a 16-byte mask that decides which set of bytes should be extracted from a packet as it enters the filtering process, to be compared against all the interface ACLs and the QoS class-maps. All filters share a single mask.

In effect, the mask is the sum of all the individual bytes required for each individual ACL or QoS match command. The number of bytes required by each ACL or match command depends on what fields it maps on. For example:

source MAC address—6 bytes

destination MAC address—6 bytes

Protocol type—2 bytes

Ethernet format—2 bytes

VLAN ID—2 bytes

IP protocol type (TCP, UDP, etc)—1 byte

source IP address—4 bytes

destination IP address—4 bytes

TCP port number—2 bytes

UDP port number—2 bytes

DSCP—1 byte

For example, if you make an ACL that matches on destination IP address and source TCP port, this adds 7 bytes to the mask:

1 byte for the IP protocol field (to indicate TCP)

4 bytes for the destination IP address

2 bytes for the source TCP port number.

If you next make an ACL that matches on source MAC address, this adds 6 more bytes to the mask.

If you next make a QoS class-map that matches on destination IP address (4 bytes) and DSCP (1 byte), this adds 1 more byte to the mask, for the DSCP. It does not add 4 more bytes for the destination IP address because the switch already matches on that field.

If you next make an ACL that matches on source IP address and source TCP port, then that does not change the mask, because the switch already matches on those fields.

If you next make an ACL that matches on source UDP port, this also does not add any length to the mask, because it shares the same 2 bytes as the source TCP port. However, if you next make an ACL that matches on destination TCP or UDP port, that uses another 2 bytes.

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Allied Telesis X900-12XT/S, x908 manual Profile mask
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X900-12XT/S, x908 specifications

The Allied Telesis x908 and the SwitchBlade x900 series of network switches are cutting-edge solutions designed to address the demands of modern networking environments. These switches are known for their high performance, reliability, and robust feature sets, making them ideal for enterprise and service provider networks.

The Allied Telesis x908 series consists of modular and chassis-based systems that can accommodate a variety of network configurations. One of the main features of the x908 series is its ability to offer high scalability with support for a large number of ports. This makes it suitable for data centers and large enterprise networks where space and bandwidth optimization are critical.

In addition to scalability, the x908 series supports advanced Layer 2 and Layer 3 switching capabilities. This allows for efficient traffic management and routing, ensuring that data is delivered swiftly and reliably. The x908 also incorporates intelligent features such as Quality of Service (QoS), which prioritizes critical network traffic, ensuring that time-sensitive data—like voice and video—maintains its quality during transmission.

The SwitchBlade x900 series takes this functionality further with its innovative modular architecture. This allows organizations to configure their networks to meet specific needs by choosing from a variety of interface cards and service modules. The SwitchBlade x900 also supports advanced security features such as Access Control Lists (ACLs) and VLAN segmentation, which provide enhanced protection against unauthorized access and network threats.

Another hallmark of the x908 and SwitchBlade series is their support for high-speed Ethernet technologies, including 10G and 40G Ethernet. This enables organizations to keep pace with the increasing bandwidth demands of applications and services, particularly in cloud computing and data-intensive workloads.

Both the x908 and the SwitchBlade x900 series are designed with energy efficiency in mind, featuring power-saving technologies that reduce overall operational costs. Coupled with Allied Telesis' management tools, which provide detailed analytics and monitoring, network administrators can optimize performance and energy consumption simultaneously.

In summary, the Allied Telesis x908 and SwitchBlade x900 series offer a comprehensive suite of features, high performance, scalability, and advanced networking technologies. They represent a strategic investment for organizations looking to build resilient, efficient, and future-proof network infrastructures.
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