MPLS BGP

Hi Experts,

JR engineer trying to solidify understanding of MPLS at the CORE. We are acting as a service provider to suites inside our building who rent space from us. Was looking over our PE configs and want to make sure I undertand the meanings of the address-family. It's used 3 times to establish a connection for a VRF. Please let me know if my assumptions are correct.

1. address-family ipv4  

This is needed so that the the PE can communicate with the P. If I remove this, the PE can no longer communicate with the P?

2. address-family ipv4 vrf RED

This is needed so that MP-BGP knows which VRF routes to carry between PE routers. Is it just routes that get carried through this command or other information?

3. address-family vpnv4

This allows #2 to work. Without this, the VRF routes will be identified to MP-BGP, but won't have a way to pass it along to other PEs.

So are all 3 address-family commands necessary? #2 and #3 seem like they are the same. I think #2 is identifying the VRF and #3 is allowing it to work. Maybe they should put those two into 1 command.
trojan81Asked:
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TYoungCommented:
The address-family ipv4 vrf <name> allows for the redistribution of VRF routes into BGP. The address-family vpnv4 specifies that the router will subsequently redistribute routes to other BGP peers under the vpnv4 context.

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trojan81Author Commented:
tyong,

So to redistribute VRF routes into BGP, the address-family ipv4 vrf (name) and address-family vpnv4 commands need to be present, correct? The two commands need to work together. So if I remove the address-family vpnv4, then vrf routes will not be able to be exchanged between PEs?
TYoungCommented:
Yes you are absolutely correct in your last post, both commands are needed.

Sorry for the delay, and happy new year.
trojan81Author Commented:
question answered.
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