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Webcast-Catalyst9k
New Member

What is VRF?

Hi

please explain me what is VRF also I have found that vrf can be configured on both router and switch. I have 3750 and 3800 so where should I configure vrf.

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2 ACCEPTED SOLUTIONS

Accepted Solutions

Re: What is VRF?

VRFs in general used to virtualizes the routing tables where you can have multiple routing tables in one physical router

VRFs can be used with MP-BGP and MPLS for network like ISPs

also VRFs can be used locally to perform separation between multiple routing instances aka VRF lite

both can be used for Path isolation

useful links

http://packetlife.net/blog/2010/mar/29/inter-vrf-routing-vrf-lite/

http://www.cisco.com/en/US/docs/solutions/Enterprise/Network_Virtualization/PathIsol.html

hope this help

plz rate the helpful posts

Super Bronze

Re: What is VRF?

Disclaimer

The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.

Liability Disclaimer

In  no event shall Author be liable for any damages whatsoever (including,  without limitation, damages for loss of use, data or profit) arising out  of the use or inability to use the posting's information even if Author  has been advised of the possibility of such damage.

Posting

VRF is sort of the L3 version of VLANs.  Whether it should be configured on your 3750 or 3800 or both depends on your needs.

To your later question about the "lite" version of VRF, this often doesn't support as many VRF instances and, on low-end devices, uses VLAN tags or GRE tags to support multiple VRF instances between devices where the full blown version uses MPLS tags.  (NB: When multiple devices share multiple VRFs across a single link, they need some way to distinguish what VRF a packet belongs to.  Sort of the L3 version of a L2 trunk.)

4 REPLIES
Hall of Fame Super Gold

What is VRF?

VRF goes hand-in-hand with MPLS.  Start reading here.  

New Member

What is VRF?

Thanks for quick response Leo. I looked at the config guide, I found VRF config is done on routers

but then I found about vrf lite

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/31sg/configuration/guide/vrf.pdf

The config is done on switches here. Can you explain me the difference and impact.

Re: What is VRF?

VRFs in general used to virtualizes the routing tables where you can have multiple routing tables in one physical router

VRFs can be used with MP-BGP and MPLS for network like ISPs

also VRFs can be used locally to perform separation between multiple routing instances aka VRF lite

both can be used for Path isolation

useful links

http://packetlife.net/blog/2010/mar/29/inter-vrf-routing-vrf-lite/

http://www.cisco.com/en/US/docs/solutions/Enterprise/Network_Virtualization/PathIsol.html

hope this help

plz rate the helpful posts

Super Bronze

Re: What is VRF?

Disclaimer

The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.

Liability Disclaimer

In  no event shall Author be liable for any damages whatsoever (including,  without limitation, damages for loss of use, data or profit) arising out  of the use or inability to use the posting's information even if Author  has been advised of the possibility of such damage.

Posting

VRF is sort of the L3 version of VLANs.  Whether it should be configured on your 3750 or 3800 or both depends on your needs.

To your later question about the "lite" version of VRF, this often doesn't support as many VRF instances and, on low-end devices, uses VLAN tags or GRE tags to support multiple VRF instances between devices where the full blown version uses MPLS tags.  (NB: When multiple devices share multiple VRFs across a single link, they need some way to distinguish what VRF a packet belongs to.  Sort of the L3 version of a L2 trunk.)

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