When playing with the MPLS Inter AS options I was obliged to use the
neighbor x.x.x.x send-label command to exchange my label information between to AS. the interesting thing is that depending on how I was send the PE loopbacks in BGP I could loose connectivity between CEs.
Lets play around with the
send-label command to see how it really works. I built a 6 router topology in 2 AS’s has shown in the following exhibit.
Internetwoking is a feature on L2VPN that makes possible to connect an ethernet interface to a frame relay interface for example. Not sure if this is in the scope of the CCIE but I fell on it while studying L2TPv3.
We are going to configure an internetworking between R1 and R9, R1 will be on ethernet and R9 on frame relay.
The topology is still based on the CsC topology with an added router R9 running frame relay with R7.
Same as for L2TPv3 we’ll go over the basic configuration of an AToM tunnel. In this example we’ll only do ethernet to ethernet. We’ll go in internetworking in another post.
As for L2TPv3 we’ll use the CsC configuration to setup our tunnels between R1 and R8
To manage this interconnection we’ll be using the interface G1/0 of R2 and G2/0 of R7.
As usual when you study CCIE you need to know at leat 2 ways to do everything, same for CsC. I know that InterNetwork Expert they say that the chances are slim to have CsC but you never know, it’s not the biggest bit of study anyway.
So for our setup I’ll be using a 8 router setup
AS100 will be our super service provider providing the CsC service, AS200 will be our CsC customer. R1 and R8 are our customer devices running EIGRP with the PE devices.
After the next-hop-self time to talk about next-hop-unchanged. I couldn’t figure out the real life usage of this before I labbed it.
In this setup I’ll use my interAS topology
R1 and R5 will be our route reflectors, they’ll be peering through eBGP multihop only for address family vpvn4. R2 and R4 will be our ASBRs they’ll peer through eBGP on address family ipv4 with send-label and redistribute the loopbacks from both AS in OSPF.