How to configure the aggregation switch of PCDN

PCDN aggregation switches are configured by grouping multiple physical ports into a logical channel using static or dynamic aggregation with LACP or PAgP, ensuring consistent port attributes and VLAN settings. Step 1: Prepare Ports for AggregationBefore aggregation, ensure all ports have consistent configurations: STP settings: Enable/disable STP, set STP priority and cost consistently.

VLA

N settings: Ensure permitted VLANs and PVID match across all ports. Port attributes: Speed, duplex mode (full duplex required), and link type (trunk, hybrid, or access) must be identical. Step 2: Choose Aggregation ModeStatic (ON mode): Adds ports to a fixed aggregation group without negotiation.

Supports up to 8 ports per group. Dynamic (LACP): Uses IEEE 802. 3ad LACP for negotiation.

Active mode: Port actively initiates LACP negotiation. Passive mode: Port responds to LACP negotiation requests. PAgP (Cisco proprietary): Automatically groups compatible ports using PAgP packets for EtherChannel formation.

Step 3: Configure Aggregation GroupEnter privileged EXEC mode and then global configuration mode. Enter interface configuration mode for each port to be aggregated. Assign the port to a channel group:interface g0/1channel-group 1 mode on! staticchannel-group 2 mode active!

LAC

P activechannel-group 3 mode passive!

LAC

P passive To remove a port from an aggregation group:no channel-group Ensure the channel group ID is consistent across all aggregated ports (range 0–5 or as supported by the switch),. Step 4: Configure Load BalancingAfter aggregation, configure how traffic is distributed across physical ports: Options include src-mac, dst-mac, src-dst-mac, src-ip, dst-ip, or src-dst-ip. Example to set source MAC-based load balancing:aggregator-group load-balance src-mac Default is usually source MAC address.

Step 5: Verify and MonitorUse commands like show etherchannel summary or show port-channel to verify aggregation status. Ensure all ports are up and participating in the logical channel. Monitor traffic distribution to confirm load balancing is effective.

Step 6: Optional System and Port PriorityConfigure system priority and port priority if required for LACP negotiation to influence which ports are active in case of conflicts or failures.

Best Practices

Always match VLANs and port attributes before aggregation.

Use LAC

P dynamic mode for better interoperability and failover. Avoid mixing static and dynamic modes in the same aggregation group. Test failover by shutting down one port to ensure traffic shifts to remaining ports.

By following these steps, a PCDN aggregation switch can be configured for redundancy, load balancing, and optimized bandwidth utilization across multiple physical links.