How to configure VRF in IOS XR

[Muhammad Thanveer]

Hello Folks,

I know this, is this correct?

Can we configure rd in ios xr? I am unable to find it.

I found somewhere that IOS XR by default uses vrf.

vrf vrf_cu1

interface interface-type1

interface interface-type2

addipv4 uni

route-target import 1:1

route-target export 1:1

Regards
Thanveer
"Everybody is genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is a stupid."       

[Vivek Ruhil · Accepted solution]

Hi

RD is configured under BGP for a particular VRF.

Example:

router bgp 1

vrf ABC

  rd 1:!

!

For more information, check the below link:

http://www.cisco.com/en/US/docs/routers/asr9000/software/asr9k_r4.3/lxvpn/configuration/guide/vcasr9k43v3.html#wp1167357

Regards

[Harold Ritter · Accepted solution]

Hi Thanveer,

in IOS-XR the RD is not configured under the VRF definition as such but rather under BGP as follow:

router bgp 100

    !        

    vrf vpn1

    rd 100:1

    address-family ipv4 unicast

      redistribute connected

    ! 

Please refer to the following document for more information.


http://www.cisco.com/en/US/docs/routers/asr9000/software/asr9k_r4.3/lxvpn/configuration/guide/vcasr9k43v3.html
 

Hope this helps

[Muhammad Thanveer]

Thanks Harold and Vivek,

I dont know whether or not to ask but I have a small doubt

This is the case even when my pe to ce potocol is other than bgp, am i right?

Regards
Thanveer
"Everybody is genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is a stupid."

[Harold Ritter]

Correct. Even if you use another PE-CE routing protocol, you will still need to configure the VRF section under the BGP configuration.

Hope this helps

[Muhammad Thanveer]

Thanks Harold,

I have a creepy doubt now.

Think I have a scenario

                R4

                 |

                 |

R1------->R2<-------R3

                 |

                 |

                R5

Here I want R1 to communicate with R3

and             R4  to communicate with R5

I have put interfaces going to R1 and R3 in vrf_1

and th interfaces going to R4 and R5 in vrf_2 in R2

Now R2 has protocol for R1 and R3 as ospf

and for R4 and R5 also has the same.

R2 is bgp free and where do I have my RD configured? How the router R2 distinguishes between two vrfs

Does it do automatically?

For the Scenario in which I have bgp and If I donot configure RD, does the router take it automatically or  I  must and should configure RD?

I am unable to catch the point why We need to configure RD in bgp addressfamily for VRF

Regards
Thanveer
"Everybody is genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is a stupid."

[Harold Ritter · Accepted solution]

Hi Thanveer,

This is more a VRF-lite (multiVRF) scenario. In such a scenario, you wouldn't even need an RD. RD is only required to make VPNv4 prefixes unique and there is no VPNv4 involved in this scenario.

Hope this helps

[Muhammad Thanveer]

Hurray....!!!!

I got the point .

Thank you very much..

Regards
Thanveer
"Everybody is genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is a stupid."