Hello @Cybermordi
Follow this please: https://www.networkacademy.io/ccna/ethernet/router-on-a-stick
In a network with multiple routers, Inter-VLAN routing is typically not configured on each router. Instead, it is usually centralized on a single device that serves as the L3 gateway for all VLANs. This device can be a L3 switch or a router specifically designated to handle the routing between VLANs.
Centralizing Inter-VLAN routing simplifies network management and reduces configuration complexity. The selected L3 device would have subinterfaces or SVIs configured for each VLAN, each with its own IP address acting as the default gateway for devices within that VLAN. The other routers in the network do not need to participate in Inter-VLAN routing unless there is a specific design requirement, such as distributing the routing load or providing redundancy.
In some cases, if there are multiple sites or segments connected via routers, routing protocols (e.g., OSPF, EIGRP, BGP) can be used between the routers to share the routing information for the VLANs, allowing for communication across different parts of the network. However, the actual Inter-VLAN routing is still typically managed by a central Layer 3 device. Configuring Inter-VLAN routing on multiple routers is less common, as it adds complexity and can lead to issues with route consistency and traffic routing.
Best regards
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