How to check the coefficients of an aggregation switch

You can check the coefficients of an aggregation switch by reviewing traffic policies, queue statistics, and aggregated Ethernet (LAG) configurations to understand traffic distribution and prioritization.

Checking Traffic Policies and Queue Statistics

To verify how traffic is handled and prioritized on an aggregation switch:

1. Display Applied Traffic Policies: Use the command display traffic-policy applied-record [policy-name] to see which traffic policies are applied to interfaces, including policy indexes, classifiers, and behaviors. This shows how packets are classified and which queues they are mapped to (e.g., queue ID, CIR, PIR, passed packets, and dropped packets) .
2. Check Queue-Based Statistics: Run display qos queue statistics to monitor queue performance on uplink interfaces. This provides metrics such as passed rate (pps), passed bytes, dropped packets, and dropped rate, helping you understand how traffic is distributed across priority queues .

Reviewing Aggregated Ethernet (LAG) Settings

For switches using link aggregation:

1. Identify Aggregated Interfaces: Aggregated Ethernet interfaces (AE or LAG) combine multiple physical links into a single logical interface. Use your switch's interface display commands to list AE interfaces and their member links .
2. Verify Load Balancing and Bandwidth: Check that traffic is balanced across all member links. Ensure that all links in the bundle have compatible speeds and that the minimum number of links required for the bundle to be active is configured correctly .
3. Check LACP or Static Aggregation: If using LACP, verify that the protocol is active and that all member links are correctly participating. For static aggregation, confirm that the logical interface is properly configured and operational .

Using Management Tools

Many aggregation switches provide web-based or SNMP management tools:

• Web Interface: Access the switch's web page or device manager to view topology, interface statistics, and applied policies .
• SNMP Monitoring: Use SNMP to query interface counters, LAG status, and QoS metrics for automated monitoring and reporting.

Summary

By combining traffic policy inspection, queue statistics, and aggregated Ethernet interface checks, you can effectively determine the coefficients or parameters that control traffic distribution and prioritization on an aggregation switch. This ensures proper load balancing, QoS enforcement, and optimal network performance.