vrv and vrf interview | vrv and vrf interview questions
What is VRF?
VRF meaning is Virtual routing and Forwarding which is a technology that allows multiple instances of a routing table to co-exist within the same router at the same time.
Because the routing instances are independent, overlapping IP addresses can be used without conflicting with each other.
The multiple Routing instances can be made to traverse different path (ie take different outgoing interfaces).
VRFs are the same methods of network isolation/virtualization as VLANs.
Related – VLAN vs VRF
VLANs are used at the L2 and VRFs are L3 tools.VRFs are to routing table like VLANs are to LANs.
Using Virtual routing and forwarding we are virtualizing routing table into multiple routing tables, similarly to VLANs used to virtualize LANs.
One could say that VLANs are performing L2 virtualization, VRFs are performing L3 virtualization. VLANs make a single switch look like several switches; Virtual routing and forwarding make a single router look like several routers.
VRF Flavours –VRF and VRF Lite
VRF has earned so much popularity in recent years due to its versatility in Data Centers, Corporate LANs and most importantly in Service provider domain.
While we talk about Service providers running MPBGP in MPLS Cloud, VRF is one of the key ingredient responsible for routing multiple customer traffic across the same underlying infrastructure.
Using VRF in provider MPLS domain increases network security and also allows segregation of customer traffic over WAN even in scenarios of overlapping address space.
Considering the superb performance of VRF, its lighter version (VRF Lite) has been widely embraced in Data Center and Campus LAN environments.
Unlike full-blown VRF, VRF Lite does not require configuration of MPBGP including some parameters like Route target etc.
In fact, it is used in data centres to provide end to end segregation of traffic belonging to different zones likes DMZ, Extranet and Inside Zones.
Such an approach has drastically reduced physical infrastructure requirements by using different Logical Routing tables (thanks to VRF Lite).
It segregates traffic of various traffic zones without the need for dedicated physical devices to perform these tasks.
Gem Engserv Interview Rounds and Process Technical
Posted on 8 Jan 2022
Multiprotocol label switching provides a way to process packets based on their labels. It’s a data forwarding service that uses labels instead of routing table lookups to enable high-end network communications from one network node to the next. The need to look up the routing table for each packet slows communication, whereas MPLS utilizes the LFIB/forwarding table to transfer labels from one node to the other.
FAQ
What is difference between VRF and VRV?
Why do we need VRF?
VRV (variable refrigerant volume) and VRF (variable refrigerant flow) are two different terms for the same technology. Because VRV is a trademark of Daikin Industries, Ltd., all other companies that copy this technology refer to it as a VRF system.
