VRF

Answered Question
Oct 2nd, 2008
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I want to create 15 subinterfaces in F0/0 and 15 subinterfaces in F0/1 and add each pair to a VFP.

EX:

F0/0.1 and F0/1.1 -> VRF1

F0/0.2 and F0/1.2 -> VRF2

.

.

F0/0.15 and F0/1.15 -> VRF15


Is it possible? What router support 15 VRFs?

Correct Answer by cpubob about 8 years 5 months ago

I just tried this on my Cisco 2600 and I stopped trying after I created 35 VRF's and added 35 subinterfaces, each belonging to 1 vrf.


I did get a warning message after the 15th vrf was created telling me that smartinit had been disabled and the system thinks thats a bad idea. I believe your only limited by memory at this point so if your low on memory, you won't be able to keep configuring vrf's but if you have a lot of free memory, you can configure a bunch.



Of course, I found Cisco's recommended numbers on this doc:


http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6557/prod_white_paper0900aecd8051fbdc.html


About 3/4 down the page is the "PERFORMANCE AND SCALABILITY" section. They only recommend 5 vrf's on a 2600XM.


Although it may be possible to configure 100 vrf's on the box and have everything working, you may run into a problem if you have to call TAC for support.


GL


-Rob

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Giuseppe Larosa Thu, 10/02/2008 - 10:22
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Hello Andre,

15 VRFs are not a scalability issue you can use whatever router supports MPLS VPN.


I would try to understand if you want to have a real PE with MPLS forwarding capabilities or a device MultiVRF CE with a subset of features.


as a multiVRF CE you can also use a multilayer switch starting from c3550 with enterprise image


as PE router you can use different platforms depending on the aggregate traffic volume you want to support/expect for your VRFs.

Again you can use a multilayer switch like C6500 with SUP720 BXL or simply an ISR router like C2811 you want to build a lab or demo.


Hope to help

Giuseppe


Correct Answer
cpubob Thu, 10/02/2008 - 10:26
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I just tried this on my Cisco 2600 and I stopped trying after I created 35 VRF's and added 35 subinterfaces, each belonging to 1 vrf.


I did get a warning message after the 15th vrf was created telling me that smartinit had been disabled and the system thinks thats a bad idea. I believe your only limited by memory at this point so if your low on memory, you won't be able to keep configuring vrf's but if you have a lot of free memory, you can configure a bunch.



Of course, I found Cisco's recommended numbers on this doc:


http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6557/prod_white_paper0900aecd8051fbdc.html


About 3/4 down the page is the "PERFORMANCE AND SCALABILITY" section. They only recommend 5 vrf's on a 2600XM.


Although it may be possible to configure 100 vrf's on the box and have everything working, you may run into a problem if you have to call TAC for support.


GL


-Rob

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