Manuals / Allied Telesis / Computer Equipment / Switch

Allied Telesis x900-48 series manual Set the required properties on the egress queues

Models: x900-48 series

1 21
Download 21 pages 2.43 Kb
Page 15
Image 15

Full QoS scenario 1: tiered services for a single customer

The act of assigning packets in a particular traffic class to a particular egress queue is achieved in the pre-marking process. This requires that the pre-marking DSCP map table be set up to send packets to appropriate queues, based on their DSCP value:

set qos dscpmap=premark dscp=0 newqueue=1

set qos dscpmap=premark dscp=30 newqueue=2

set qos dscpmap=premark dscp=40 newqueue=6

The traffic classes all need to be configured to use the DSCP value in the incoming packet as the index to use in looking up this premarking table:

set qos trafficclass=1 premark=usedscp

set qos trafficclass=2 premark=usedscp

set qos trafficclass=3 premark=usedscp

XSet the required properties on the egress queues

The premarking process will use the DSCP map to decide which egress queue to direct the packets into, but that will only be of any use if the egress queues have been set up with the required properties.

What is required is that:

Gold traffic ALWAYS has precedence over Silver or Bronze traffic. So, when a Gold packet arrives at the egress port, it is transmitted immediately, irrespective of how many Silver or Bronze packets might be queued up.

When there are Silver and Bronze packets queued up, they are transmitted according to a Weighted Round Robin (WRR) scheme.

This is achieved by ensuring that the egress queue to which Gold traffic is directed to is a priority queue, and the egress queues to which the silver and bronze traffic are directed are WRR queues.

Actually, we also want to set the egress queue for the packets generated by the switch's CPU (like STP, BGP, OSPF …) to queue 7, and make this the highest priority queue of all, to prevent any loss of these packets.

set switch cputxque=7

So, we need to specify the queue types of queues 1, 2, 6, 7 on port 24:

set qos port=24 egressqueue=6,7 scheduler=strict

set qos port=24 egressqueue=1,2 scheduler=WRR1

The relative weights to give to Silver and Bronze traffic are set by specifying the WRR weight for their queues. For example, to give a 4:1 ratio of Silver to Bronze traffic:

set qos port=24 egressqueue=1 wrrweight=1

set qos port=24 egressqueue=2 wrrweight=4

Page 15 AlliedWare™ OS How To Note: QoS configuration

Page 14 Page 16
Page 15
Image 15
Allied Telesis x900-48 series manual Set the required properties on the egress queues, What is required is that
Page 14 Page 16

x900-48 series specifications

Allied Telesis X900-48 series switches are designed for high-performance networking, making them ideal for enterprise and service provider environments. This series offers advanced features and capabilities that ensure efficiency, scalability, and reliability for demanding network infrastructures.

One of the main features of the X900-48 series is its high port density. With 48 Gigabit Ethernet ports, the switch provides ample connectivity options for numerous devices, which is essential for organizations experiencing rapid growth. Additionally, it supports 10 Gigabit uplinks, allowing for high-speed connections to core networks or other switches, optimizing overall network performance.

The X900-48 series is equipped with a rich set of Layer 2 and Layer 3 features. It supports advanced routing protocols such as OSPF and BGP, enabling efficient and intelligent data routing. The inclusion of VLAN support allows for network segmentation, enhancing security and performance by isolating different traffic types. The support for IPv6 ensures that the network can accommodate future growth as more devices come online.

Quality of Service (QoS) is another critical feature of the X900-48 series. It utilizes intelligent traffic management to prioritize critical applications, ensuring a consistent user experience even during peak loads. The switch supports Power over Ethernet (PoE/PoE+), allowing it to provide power to connected devices like IP phones, cameras, and access points over the same network cable, simplifying installation and reducing costs.

Security is paramount, and the X900-48 series takes this into account with features such as IEEE 802.1X port-based authentication, Access Control Lists (ACLs), and DHCP snooping. These measures protect the network against unauthorized access and enhance data integrity.

The X900-48 series is also built with energy efficiency in mind. It complies with energy standards and integrates technologies that reduce power consumption, making it a cost-effective choice for sustainable networking without compromising performance.

Overall, the Allied Telesis X900-48 series represents a robust, versatile, and efficient switching solution tailored for modern networking demands. Its combination of high port density, Layer 2/Layer 3 functionality, advanced traffic management, and security features makes it suitable for a wide range of applications, ensuring that organizations can meet their networking challenges effectively.