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Basics of VXLAN

 Maximum number of VLAN is 4000 where  VXLAN can give 16 million Virtualization by adding 24 bit VNI network Identifier. This Vxlan encapsualtion is called Virtual Ethernet modul or VEM. Each VEM has IP address. The IP is assigned to interface VTEP==>> Vxlan Tunnel end point Each VTEP interfaces associated with one or more VNIs. VXLAN usage is can create multiple tunnels over a underlay network. Mainly used on Spine- Leaf Design  bum traffic for broadcast VXLAN can do the load balance between the port channel. Multiple VNI can associated with same multicast group. ========================================= HSRP VS VRRP VS GLBP HSRP and GLBP is cisco properatory VRRP is opensource protocol. HSRP active and standby and VRRP follows master and slave. VRRP can use interface IP as virtual IP. HSRP sents Hello messages but VRRP sents adverticements. GLBP is used to do for load balancing between routers. It uses different mac address for different machine traffic. SSO: ====...
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ARP and It is Type:

ARP:

Abbreviations :  Address Resolution Protocol:

It operates between Data link layer and Network Layer.

ARP main function is matching network devices MAC address with it's allocated IP address.
This helps other devices to find MAC address based on IP. This way communication between the devices is fast and easy.

Limitations:

It mainly works on a single sub net. It a packet wants to go out of the network they uses the gateway's MAC address as a source .


Types:

1. Reverse ARP.

It act in reverce way of actual ARP.
It Maps MAC addres to IP address  .It  ask its IP  to others and Maps ot.. 

This RARP is been replaced by DHCP now a days .. 

2. Proxy ARP.
3. Inverse ARP.
4. Gratuitous ARP.




Gratuitous ARP:

When machines started to communication they need to establish ARP process to establish the connections between them.

If we enable Gratuitous ARP on the switch ports, It prevent switch from mapping IP address from fake MAC address during ARP process.

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