Huawei 7721 Aggregation Switch

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The Huawei 7721 Aggregation Switch functions as a high-performance gateway in campus networks, supporting stacking, link aggregation, VLAN management, and centralized control for wired and wireless users.

Role in Campus Networks

The Huawei 7721 is typically deployed as an aggregation switch in campus networks, positioned between core switches and access switches or APs. It serves as a gateway for both wired and wireless users, handling routing, forwarding, and DHCP services. Aggregation switches like the 7721 can be stacked to increase interface density, bandwidth, and redundancy, ensuring high network reliability and scalability .

Stacking and Redundancy

Huawei 7721 supports stacking technologies such as CSS (Cluster Switching System) or iStack, allowing multiple switches to operate as a single logical device. Key stacking features include:

Master/Standby hierarchy for failover
Synchronized configurations across stack members
Cross-device link aggregation (Eth-Trunk) for load balancing
Ring topology recommended for redundancy, avoiding single points of failure
Dedicated stack ports for high-speed synchronization

Link Aggregation (Eth-Trunk)

The 7721 supports Layer 2 and Layer 3 link aggregation using Eth-Trunk interfaces:

Manual mode: All links participate in load balancing
LACP mode: Active and backup links provide redundancy
Aggregated links can be configured for Layer 2 VLAN trunking or Layer 3 routed interfaces with IP addresses

Management and Deployment

Huawei 7721 switches can be managed via iMaster NCE-Campus or standalone ACs:

Zero Touch Provisioning (ZTP) allows automatic online deployment
Management VLAN auto-negotiation simplifies plug-and-play setup
DHCP server functionality can be enabled on aggregation switches to assign IPs to downstream devices
VRRP and HSB can be configured for high availability in gateway scenarios

Best Practices

Ensure uniform VRP versions across stack members
Use certified stack cables and verify physical connections
Configure member IDs and priorities before connecting stack cables
Enable cross-member Eth-Trunk aggregation for optimal traffic distribution
Schedule maintenance reboots to test failover and monitor stack health via SNMP

Summary

The Huawei 7721 Aggregation Switch is a versatile, high-performance device for campus networks, providing stacking, link aggregation, VLAN management, and centralized control. Proper configuration of stacking, Eth-Trunks, and management VLANs ensures high availability, scalability, and efficient traffic forwarding for both wired and wireless users.

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