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MPLS L3VPN

Latest reply: Jul 1, 2020 03:40:10 163 7 1 0

we want to implement mpls l3vpn to connect customers branches through mpls cloud,

Please, I  need help about this:

-          Which is the best PE-CE routing protocol

-          Which is the best network topology for vpn (mesh or hub-spok)


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chenhui
Admin Created Jun 25, 2020 00:50:34 Helpful(0) Helpful(0)

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jahangirgp
MVE Created Jun 25, 2020 02:47:14 Helpful(2) Helpful(2)

As per my observation:

Which is the best PE-CE routing protocol:
underlay: ISIS
Overlay: IBGP with route reflector,
- Which is the best network topology for vpn (mesh or hub-spok)- mesh will be good in case of protection requiments
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Kolli Created Jun 29, 2020 21:23:46
what are mean "overlay" and underlay" ?  
jahangirgp Reply Kolli  Created Jun 30, 2020 05:01:05
Overlay: Higher level, depends on other protocol- for instance- to run MPLS(overlay) you need IGP(OSPF,ISIS), BGP as lower layer protocol, another expemple: IP protrol(Over protocol) run over DWDM(underlay)
An Overlay Network is a virtual network that is built on top of underlying network infrastructure (Underlay Network). Actually, “Underlay” provides a “service” to the overlay.

Underlay: lower level. Underlay Network is physical infrastructure above which overlay network is built.  
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tesfama
Created Jun 29, 2020 13:13:44 Helpful(0) Helpful(0)

Overlay: IBGP
underlay: OSPF is preferred.
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tesfama Created Jun 29, 2020 13:14:31
but this is for intra-AS MPLS.  
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taipm
Created Jul 1, 2020 03:40:10 Helpful(0) Helpful(0)

We can use:
intra-AS : underlay OSPF / overlay IBGP / MPLS
inter-ASS: between two AS use eBGP unicast label.
-> Target Unified MPLS
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