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VRF-OSPF, what is the max number of VRFs recommended?

marta.mendez
Level 1
Level 1

Hi everyone,

 

We have a network with three routers, where we differentiate client services via VRFs. The current configuration is VRF lite with OSPF (one ospf process per vrf). Does anyone know what is the maximum number of VRFs to be used safely in this scenario?

 

We are working with 8 VRFs at the moment, and are concerned about scalability to accommodate more clients (and their correspondent VRFs) in the future with this configuration.

 

Thanks in advance.

Best regards,

Marta

3 Accepted Solutions

Accepted Solutions

balaji.bandi
Hall of Fame
Hall of Fame

It all depends what device you have, since your original ticket not mentioned the device model and license you have

please refer Cisco document :

 

https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/multiprotocol-label-switching-mpls/prod_white_paper0900aecd8051fbdc.html

 

BB

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View solution in original post

Hi

It depends of your network device hardware, usually they support more than 50 VRFs. Please check this link: https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/multiprotocol-label-switching-mpls/prod_white_paper0900aecd8051fbdc.html

 

These are for ISR Generation 1 and 2, the new router series are more robust. 

 

Hope it is useful

:-)




>> Marcar como útil o contestado, si la respuesta resolvió la duda, esto ayuda a futuras consultas de otros miembros de la comunidad. <<

View solution in original post

I am not aware of a hard limit for the amount of vrf that can be created, you however have to keep in mind that that you will be eventually limited by the amount of interfaces the devices will handle along with the load that is being placed on these devices.

Example :  Amount of dynamic routing protocols being spun up for each vrf as well as the amount of prefixes in each routing table plus overall throughput.

I have a client that has several 2821 series routers on his network  with over 25 vrf, the reason he has not ran into any severe issues as of yet is that these vrf are only passing a maximum of 20Mbps with a few ospf sessions overall.

Eventually as the clients require additional bandwidth he will be forced to upgrade as its a growing network.

P.Williams

View solution in original post

9 Replies 9

balaji.bandi
Hall of Fame
Hall of Fame

It all depends what device you have, since your original ticket not mentioned the device model and license you have

please refer Cisco document :

 

https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/multiprotocol-label-switching-mpls/prod_white_paper0900aecd8051fbdc.html

 

BB

***** Rate All Helpful Responses *****

How to Ask The Cisco Community for Help

Thanks baladí.bandi for the fast response. There is no mention of OSPF on that document... the routers are: Cisco 3945, Cisco 7206 VRX, Cisco 2911

OSPF i do not see limitation here, the document which i was referring for VRF limitations based on the device.

 

BB

***** Rate All Helpful Responses *****

How to Ask The Cisco Community for Help

Hi

It depends of your network device hardware, usually they support more than 50 VRFs. Please check this link: https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/multiprotocol-label-switching-mpls/prod_white_paper0900aecd8051fbdc.html

 

These are for ISR Generation 1 and 2, the new router series are more robust. 

 

Hope it is useful

:-)




>> Marcar como útil o contestado, si la respuesta resolvió la duda, esto ayuda a futuras consultas de otros miembros de la comunidad. <<

Thanks Julio! And what parameter would you check to see if the number of VRFs are too many for the router to handle? CPU consumption?

 

Best regards,

Marta

Hi

You should verify the router model used for the VRF, on the link you can see routers supporting more than 75 VRFs and suggested entries into the routing table. 

You could verify how many entries there is into the routing table, I think you could be working fine unless you are a service provider and you are receiving many of many routes, for example from BGP. CPU utilization can be used to determine if you are reaching the limit of resources supported. 




>> Marcar como útil o contestado, si la respuesta resolvió la duda, esto ayuda a futuras consultas de otros miembros de la comunidad. <<

I am not aware of a hard limit for the amount of vrf that can be created, you however have to keep in mind that that you will be eventually limited by the amount of interfaces the devices will handle along with the load that is being placed on these devices.

Example :  Amount of dynamic routing protocols being spun up for each vrf as well as the amount of prefixes in each routing table plus overall throughput.

I have a client that has several 2821 series routers on his network  with over 25 vrf, the reason he has not ran into any severe issues as of yet is that these vrf are only passing a maximum of 20Mbps with a few ospf sessions overall.

Eventually as the clients require additional bandwidth he will be forced to upgrade as its a growing network.

P.Williams

zinogarphy
Level 1
Level 1

@marta.mendez wrote:

Hi everyone,

 

We have a network with three routers, where we differentiate client services via VRFs. The current configuration is VRF lite with OSPF (one ospf process per vrf). Does anyone know what is the maximum number of VRFs to be used safely in this scenario? Xvideos Youporn Xhamster

 

We are working with 8 VRFs at the moment, and are concerned about scalability to accommodate more clients (and their correspondent VRFs) in the future with this configuration.

 

Thanks in advance.

Best regards,

Marta


It all depends what device you have, since your original ticket not mentioned the device model and license you have

What model Routers or Switches are you using

P.Williams
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