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• Creating Customized Port Profiles    

• Related Topics
• Port Profile Overview
• Creating a Customized Desktop Port Profile
• Creating a Customized Desktop and Phone Port Profile
• Creating a Customized Switched Uplink Port Profile
• Creating a Customized Switched Downlink Port Profile
• Creating a Customized Server Port Profile

Creating Customized Port Profiles

General Settings

Configuring general settings for a customized port profiles, as shown in the figure, includes setting parameters such as a name and description for the profile, and selecting the port profile that you want to customize. Junos Space automatically generates a profile name for the new customized profile. For example, DesktopPort_1.

CoS Settings

The Scheduler Map Configuration block specifies the buffer size, bandwidth, and priority for a queue. By defining schedulers, you can configure the properties of output queues that determine the transmission service level for each queue. These properties include the amount of interface bandwidth assigned to the queue, the size of the memory buffer allocated for storing packets, and the priority of the queue. After defining schedulers you associate them with forwarding classes by means of scheduler maps. By default, the schedulers values are already set.

Forwarding classes allow you to group packets for transmission. You then associate each scheduler map with an interface, and configure the hardware queues and packet schedulers that operate according to this mapping.

When applying or provisioning a port role to an interface, you must map the forwarding classes and schedulers using the scheduler map. The following figure shows the CoS settings that you can set while customizing a port profile.

The schedulers and their settings are:

• Voice— Gets low-latency, strict priority treatment through the fabric and where the packet was sent. Transmission rate is set to 10 percent and buffer size to 5 percent.
• Expedited forwarding— Delivers assured bandwidth, low loss, low delay, and low delay variation (jitter) end-to-end for packets in this service class. Software accepts excess traffic in this class, but in contrast to assured forwarding class, out-of-profile expedited-forwarding class packets can be forwarded out of sequence or dropped. For an expedited scheduler, the transmission rate is set to 30 percent, the buffer size to 30 percent, and priority is set to low.
• Assured forwarding— Offers a high level of assurance that the packets are delivered as long as the packet flow from the customer stays within a certain service profile that you define. The software accepts excess traffic, but applies a tail drop profile to determine if the excess packets are dropped and not forwarded. Up to two drop probabilities (low and high) are defined for this service class. For assured scheduler, the transmission rate is set to 25 percent, the buffer size to 25 percent, and priority is set to low.
• Best effort forwarding— Is a backward compatibility feature. These packets are usually dropped under congested network conditions. For a best effort scheduler, the transmission-rate is set to 35 percent, the buffer size to 40 percent, and priority is set to low.

These are the settings for the Juniper predefined port profiles. While customizing, you can optimize your communication with the network by changing the transmission rate and buffer size. You must ensure that the cumulative bandwidth and buffer percentages is always be 100 percent or less. For example, if the total bandwidth percentage already adds up to 100, you must reduce the bandwidth of one of the categories to increase the bandwidth of another.

Ethernet Switching Options

You can use the Ethernet Switching Options page to set the broadcast limit for network traffic. The broadcast limit is the theoretical maximum of network bandwidth in percent that can be used for broadcast and multicast traffic. Any broadcast or multicast traffic exceeding that limit will be dropped. A zero value (0) indicates that the feature is disabled.