Recommendations: Dual Core Switch for redundancy.
Hi Experts, May I ask for your recommendations for this kind of setup. Best practices and other routing and switching stuff. I have the following: 1
Core switch uses dual routing
Dual routing on a core switch can be implemented using redundant Layer 3 links, VRRP/HSRP for gateway redundancy, and dynamic routing protocols like OSPF to manage failover and load balancing.Core PrinciplesRedundancy and high availability are the main goals of dual routing. This involves connecting multiple core switches with redundant links and ensuring that traffic can failover seamlessly if one path or device goes down . Gateway redundancy is typically achieved using VRRP (Virtual Router Redundancy Protocol) or HSRP (Hot Standby Router Protocol). These protocols allow multiple core switches to share a virtual IP address as the default gateway for downstream devices, ensuring uninterrupted Layer 3 connectivity . Dynamic routing protocols such as OSPF or EIGRP are used between core switches and firewalls or other upstream routers. These protocols advertise routes and allow the network to automatically select the preferred path based on cost metrics, providing both failover and load balancing .Step-by-Step ImplementationPhysical RedundancyConnect each core switch to all access switches using multiple links.Use EtherChannel or LAG (Link Aggregation Group) to bundle links for higher bandwidth and redundancy .Connect core switches to each other with a dedicated Layer 3 link for routing synchronization.Configure Gateway RedundancyEnable VRRP or HSRP on the core switches for each VLAN SVI (Switched Virtual Interface).Assign a virtual IP as the default gateway for hosts.Set priorities to control which core switch is active and which is standby.Enable Dynamic RoutingConfigure OSPF or EIGRP between core switches and firewalls.Advertise VLAN subnets and default routes to ensure proper routing.Adjust OSPF cost metrics to control preferred paths and load balancing .Inter-VLAN RoutingConfigure SVIs on the core switches for each VLAN.Ensure that routing between VLANs occurs at the core switch to avoid unnecessary traffic to external routers, improving performance .Layer 2 ConsiderationsUse MSTP or RSTP to prevent loops in redundant Layer 2 links.Optionally, implement VSX or MC-LAG if supported, to allow dual connections without relying on STP for loop prevention .Monitoring and Failover TestingTest failover by shutting down links or core switches to ensure traffic reroutes correctly.Monitor routing tables and VRRP/HSRP states to verify redundancy.Best PracticesKeep core switches as Layer 3 devices and avoid running STP on them if using VSX or MC-LAG.Assign low bridge priorities to core switches to control root bridge selection in spanning tree.Use consistent VLAN and IP addressing schemes across cores to simplify routing and redundancy.Document all routing policies, VRRP/HSRP priorities, and EtherChannel configurations for maintenance and troubleshooting . By following these steps, you can implement dual routing on core switches that provides high availability, efficient inter-VLAN routing, and seamless failover in case of link or device failure.
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Routing on firewall or core switches? : r/networking
In my research I''m getting mixed suggestions - Some say that core switches are for routing, when others say that core switches have to be as fast as possible and have minimal tasks dedicated to them.
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Recommendations: Dual Core Switch for redundancy.
Have both CORE switches have a route via each link to the firewall and control the preferred path with OSPF cost. Also add a trunk group ether-channel between the core switches too.
What Is a Core Switch?
Enables IP routing between VLANs, subnets, and security zones, with advanced routing protocols. Includes dual power supplies, hot-swappable modules, link aggregation (LAG), and support for
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The core layer is critical, yet very simple to design, and allows for network evolution quite easily. Point-to-point links are used between each element, and Fortinet recommends using the MCLAG and dual
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LAN Topologies
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