You are provisioning a new customer for access to your Layer 3 VPN. The customer is using 172.16.35.0/24 as their internal IP address space, which is also being used by an existing Layer 3 VPN customer. The two customers share many PE routers in common across your network.Which mechanism allows these duplicate addresses to exist in your network?
A.
route origin
B.
route target
C.
route refresh
D.
route distinguisher
answer is B route Target
Joseph!!!! Look a simple google search would help you understand! Here:
http://www.rogerperkin.co.uk/ccie/index.php/mpls/route-distinguisher-vs-route-target/
And that is Cisco!!!
http://www.juniper.net/techpubs/software/junos/junos94/swconfig-routing/configuring-a-route-distinguisher_1.html#id-10850884
ADMIN!!! Please consider limiting or at a minimum placing Josephs comments in a pending status until verified. This must be deliberate! Somebody expecting to break into the Service Provider Routing/Switching cannot be so ignorant and completely clueless!!! Otherwise it is deliberate and for that reason should be banned!! I am going to look to see if he has entered a single correct guess!
Route Target is correct. The RD is unique only to the local router, it’s the RT that really defines the VPN. You can have two customers with different RD configure on multiple PE yet it’s the RT that you need to consider when you import or export their routes and that is what you use to control routes from being leaked between different VPN.
No, traffikator is right!
The route distinguisher helps making the prefixes unique as VPNv4 addresses, so that they can be seperated for every customer. Please note that “the two customers share many PE routers”!!! That means that prefixes of BOTH customers will be imported on some PEs no matter what the route target is!
D is correct.
Each routing instance must have a unique route distinguisher.
Route target is dependent on a setup of import-policy and export-policy, and it can overlaps.