There are two kinds of RD(router distinguish) , what is second RD for?

[wfqk]

There are two kinds of RD. One is under global mode, second is under bgp mode as below. What is second used for? Thank you

router bgp 2111

 vrf WWE

  rd 2111:222

[Vinit Jain]

If I'm not mistaken, the stated configuration is on IOS XR router. 

the way of configuring / defining RD in IOS XR is different than IOS device. in IOS device, it is configured in VRF configuration mode as shown below:

ip vrf ABC
rd 1:1
. . . 

In IOS XR, the same RD is configured under BGP VRF configuration.

Hope this answers your question

Thanks

Vinit

[wfqk]

Thank you so much for your reply. I think you are right.

Due to some reason, the RD value is wrong. so if we change it, what would happen? what else do we need to do if we want to change the RD? thank you again

[Vinit Jain]

If there is active traffic flowing through that VRF, that will get affected. So its better to do it during a change / maintenance window.

- Also note that changing the RD sometimes takes time to update on the system itself (usually seen on IOS devices), thus traffic across that VRF will get impacted. So ensure you have extended window. 

- If you run into any kind of issues, then best is to remove the VRF and re-add the VRF with new RD value.

Hope this helps.

Thanks

Vinit

[wfqk]

I think you are right. I could not find document for it. Can you provide a link how to change rd? Thank you