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How many VRF's can I create on a single 2800 router

249856K/12288K bytes of memory available.

I am using OSPF. What are the guidelines, if any.

7 REPLIES

Re: How many VRF's can I create on a single 2800 router

Hi,

I don't think that there is a maximum allowed number of VRFs, i think it would be a function of the platform and memory.

But remember one thing, you can't have more than 30 OSPF process on a router, accordingly the maximum number of VRFs running OSPF would be 30 (router ospf id vrf vrf_name).

HTH, please rate if it does help,

Mohammed Mahmoud.

Cisco Employee

Re: How many VRF's can I create on a single 2800 router

Mohammed,

The restriction on the number of OSPF processes has been removed in 12.3T.

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Re: How many VRF's can I create on a single 2800 router

Hi Harold,

Thank you for the update, what would be the maximum number now (i think that it was related to the maximum number of routing processes that can run on a single router).

BR,

Mohammed Mahmoud.

Cisco Employee

Re: How many VRF's can I create on a single 2800 router

Mohammed,

You are correct, the limitation was due to the maximum number of Process Data Block (PDB) that could exist in IOS and the fact that each OSPF VRF instance was using a separate PDB. The PDB is an internal IOS structure just as the IDB is.

The limit of 32 PDBs is still there but now all the OSPF VRF instances are link to the same PDB, although they run as separate processes.

The limit now is purely related to resources (memory, processor, etc) available on a given device.

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Re: How many VRF's can I create on a single 2800 router

Hi Harold,

Thank you for this nice info, this kind of info is not available in books.

BR,

Mohammed Mahmoud.

Cisco Employee

Re: How many VRF's can I create on a single 2800 router

Mohammed,

You are very welcome. You are correct about the fact that some of that information can't be found in any book. It would take too big of a book ;-)

Have a great weekend,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Re: How many VRF's can I create on a single 2800 router

Thanks Harold, have a nice weekend you too.

BR,

Mohammed Mahmoud

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