Article Overview
To prevent aggregation switches from accessing each other, use management VLAN isolation, ACLs, and proper Layer 2/Layer 3 segmentation.
Management VLAN Isolation
Configure a dedicated management VLAN for each aggregation switch or group of switches. By assigning each switch to its own management subnet and enabling VLAN auto-negotiation only with the core switch, you can ensure that aggregation switches do not communicate directly with each other over the management network . Use static IP addressing or DHCP with restricted ranges to further control access.
Access Control Lists (ACLs)
Apply ACLs on the interfaces connecting aggregation switches to the network. ACLs can block traffic between aggregation switches while allowing necessary traffic to and from access switches or the core layer . For example, you can create rules that deny all traffic between the IP addresses of aggregation switches but permit traffic to monitoring or core devices.
Layer 2/Layer 3 Segmentation
- EAPS Domains: If using Layer 2 aggregation, configure EAPS (Ethernet Automatic Protection Switching) domains to isolate traffic and prevent loops between aggregation switches . Each aggregation switch can act as a master or transit node in separate domains, ensuring fault isolation.
- Protected VLANs: Assign protected VLANs to prevent broadcast or unicast traffic from traversing between aggregation switches unnecessarily .
- Routing Segmentation: At Layer 3, ensure that aggregation switches are in separate subnets and use routing policies to prevent inter-switch routing unless explicitly required.
Additional Best Practices
- Disable unnecessary trunking between aggregation switches to avoid accidental Layer 2 bridging.
- Use private VLANs or port isolation features on access ports if aggregation switches are connected to the same physical infrastructure.
- Monitor traffic using SPAN or TAP aggregation switches to verify that no unauthorized inter-switch communication occurs . By combining management VLAN isolation, ACL enforcement, and proper Layer 2/Layer 3 segmentation, you can effectively prevent aggregation switches from accessing each other while maintaining connectivity to access and core layers. This approach also enhances network security and reduces the risk of broadcast storms or misconfigurations.
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