MPLS-VPN design best practices

I was hoping someone could help me with building some redundancy in the backbone of my lab. I have 4 PEs and 2 P routers. All provider routers are running OSPF and the PEs are running iBGP.

My questions:

- How can I redesign this to best practices in case some routers fail? Do I need to add 2 more P routers to do this right?

-Where would I introduce a RR? Would it be a P router? Would it have any other function?

thanks
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orusAsked:
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harbor235Commented:


You only have two P routers so this does limit your choices but you still have alot you could do

Here are  a couple things that I would look at;

1) Home your PE's to multiple Ps
2) Extend dot1q from your PEs to your CEs to better facilitate service expansion or when delivering multiple services to a CE
3) Add a redundant link between the Ps or add another P into a triangle architecture
4) Home your CEs to muliple PEs

As far as Route Reflector, you can hang it off one of the Ps and can be a router on a stick, the RR does not have to forward user traffic, the PEs just need to route to it so it can iBGP peer.

harbor235 ;}
orusAuthor Commented:
"As far as Route Reflector, you can hang it off one of the Ps and can be a router on a stick, the RR does not have to forward user traffic, the PEs just need to route to it so it can iBGP peer.
"

Can you show me what you mean?  I know what router on a stick is, but not sure how it would work in this network.  

The RR will speak iBGP to the PEs correct?  Placement in the provider network does not matter, as long as connectivity is there?
harbor235Commented:

So all that is needed is that the PEs can route to it and form a iBGP adjacency, so if you add a single link off one of the Ps, enable OSPF/IS-IS, LDP, MPLS etc, and peer with a loopback address you now have connectivity from all PEs to the RR, remember, you need the RR to overcome scaling issues and as a way to get aroound the iBGP limiatations, it's function is to provide a central peering route for distribution of customer routes

harbor235 ;}

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