Replacing the core switch with Sangfor

Replacing your core switch with Sangfor involves careful planning of VLANs, Layer 2/3 configurations, and migration steps to ensure minimal downtime and seamless integration with Sangfor NGAF or HCI.

Planning and Preparation

Before replacing your core switch, document your current network topology, including VLANs, IP segments, routing protocols, and connected devices. Decide whether the Sangfor NGAF will act as the VLAN gateway or if the switch will retain that role, as this affects Layer 3 configurations and routing paths .

• Scenario 1: Switch as VLAN gateway – configure VLANs on the switch and point the default gateway to NGAF. Ensure NGAF has return routes to the switch.
• Scenario 2: NGAF as VLAN gateway – configure VLANs on the NGAF, and the switch operates in Layer 2 mode, trunking all VLANs. Inter-VLAN communication is managed by the NGAF .

Configuration Steps

1. Set up the new Sangfor switch next to the existing core switch. Preload basic configurations such as VLANs, SVIs, ACLs, and QoS settings .
2. Map interfaces carefully to match the current network connections. Triple-check IP addresses, loopbacks, and routing protocols to avoid conflicts .
3. Integrate with upstream devices (firewalls, routers) and ensure routing adjacencies are established. If using HSRP or VRRP, configure them on the new switch before migration .
4. Migrate VLANs gradually during a maintenance window. Shut down one VLAN on the old core, bring it up on the new Sangfor switch, and verify connectivity before moving the next VLAN .
5. Test thoroughly for inter-VLAN communication, internet access, and connectivity to critical servers or storage arrays.

Advantages of Using Sangfor

• Seamless integration with HCI: Sangfor HCI consolidates compute, storage, networking, and security, reducing operational silos and simplifying management .
• Built-in security: NGAF provides kernel-level protection, micro-segmentation, and vulnerability management, reducing reliance on third-party security solutions .
• Cost efficiency: Sangfor solutions can reduce TCO compared to traditional enterprise switches while supporting high availability and minimal downtime .

Best Practices

• Maintain a baseline configuration document for reference during migration .
• Schedule the migration during low-traffic periods to minimize business impact .
• Consider gradual migration over a weekend or phased approach to reduce risk.
• Verify compatibility with existing edge switches and ensure trunking and VLAN propagation are correctly configured . By following these steps, you can replace your core switch with a Sangfor solution while maintaining network stability, security, and minimal downtime.