With VRF mode, the switch sees the interface VLAN as a point-to-point connection; the packets are placed directly onto the interface VLAN. But having an extremely big and unsecured network means that a lot of people are able to gain access to any unsecured network and traffic. VRF acts like a logical router, but while a logical router may include many routing tables, a VRF instance uses only a single routing table. Starting with our Layer 2 network design pictured above, we replace the “Big Core Switch” with a router (practically speaking, if you already have a Big Core Switch that can handle VRF’s, routing protocols, and a lot of ARP, you don’t need to change hardware). Additionally, the VRF configuration requires scale on the following fronts: Every VRF will require a unique VLAN, a unique IP address, a unique subinterface and additionally, a unique route peering. Logical Router. Without VRF awareness, HSRP would get confused, whereas the capability allows the protocol to maintain a separate state for the two set of interfaces, as follows: However, because each type VLAN its own domain, a mechanism is needed for VLANS to pass data to other VLANS without passing the data through a router. VLANs reduce the load on a network by keeping local traffic within a VLAN. Just as with a VLAN based network using 802.1q trunks to extend the VLAN between switches, a VRF based design uses 802.1q trunks, GRE tunnels, or MPLS tags to extend and tie the VRFs together. VLAN vs VPN. When a crypto map is attached to an interface VLAN and the ip vrf forwarding command has associated
However, the VRF awareness capability allows, for example, to have two separate Layer 3 VLAN interfaces with overlapping IP addresses and mapped to different VRFs (for example Red and Green).
A virtual LAN or VLAN is any broadcast domain that is segregated and isolated at the data link layer OSI layer 2. Using VRF’s, however, on a capable router or layer 3 switch attached to your firewall, we can overcome these issues. Which eliminates the need to use Spanning Tree Protocol (STP) to converge the topology – but with a more … Each VRF has its own interface VLAN.

SVI vs VLAN.

VXLAN allows you to create smaller layer 2 domains that are connected over a layer 3 network. Networks have grown astronomically over the years and has eventually led to development of the internet which spans the whole world. The biggest challenge with a VRF lite solution is that the VRFs, though configured locally on the switches, are globally significant on the spines. VXLAN vs VLAN: Why Choose VXLAN Instead of VLAN?