skywalker7
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BGP, Full Mesh and Route Reflector setup
Hello Experts,
We are small wisp, and have an ospf network, as attached, and now we want to do full mesh bgp and route reflection, i ahve tried to read on internet but cannot understand how full mesh is implemented and works, on the map R1 and R2 are main routers, and R3 to R9, are routers but have clients connected to them, part of our main ospf network. This is just an example but we have like 30 routers, with clients on them and connected by various links, wireless and fiber so multiple link to each router.
If i do full mesh bgp, how do i link all these up ?
Any pointers ?
Many thanks for the time.
map.png
We are small wisp, and have an ospf network, as attached, and now we want to do full mesh bgp and route reflection, i ahve tried to read on internet but cannot understand how full mesh is implemented and works, on the map R1 and R2 are main routers, and R3 to R9, are routers but have clients connected to them, part of our main ospf network. This is just an example but we have like 30 routers, with clients on them and connected by various links, wireless and fiber so multiple link to each router.
If i do full mesh bgp, how do i link all these up ?
Any pointers ?
Many thanks for the time.
map.png
ASKER
At the moment all is osfp, I just want to start to configure ibgp on these routers as full mesh, but have no idea on which routers to configure and how to peer to each other.
Thanks,
Thanks,
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ASKER
Thank you for the response, at the moment I am not doing bgp with upstream, and i only want to do full bgp mesh where later i can do route reflect, after that i can do bgp with my clients who are connected to me with more then one link.
But am stuck on how to do full mesh bgp, how do i go about it, like R3 - R4, and R4-R5 and R5 - R6 or how do i go about it.
Thanks.
But am stuck on how to do full mesh bgp, how do i go about it, like R3 - R4, and R4-R5 and R5 - R6 or how do i go about it.
Thanks.
Full-mesh would require that each router is configured as a neighbor to every other router. So, in your diagram, on R1, you'll configure a neighbor to R2, R3, R4, ... , R9. Same then for R2 (neighbors to R1, R3, ... , R9), and so on. This can become tiresome on 30 routers, which is where route-reflectors start to become handy.
Remember that BGP runs on TCP sessions between BGP speakers, so a) neighbors does not need to be directly connected, and b) you will still need an IGP for internal reachability.
Remember that BGP runs on TCP sessions between BGP speakers, so a) neighbors does not need to be directly connected, and b) you will still need an IGP for internal reachability.
ASKER
Thank you for the response.
To make it simple, can i make R1 and R2 to be route reflectors and R3 to R7 to peer with R1 and R2 ? Would that work ? and do i do iBGP ? and if a client connects to R5 and R9, how can i do BGP with client, Ibgp or eBGP ? thanks.
I have ospf for internal reachability.
To make it simple, can i make R1 and R2 to be route reflectors and R3 to R7 to peer with R1 and R2 ? Would that work ? and do i do iBGP ? and if a client connects to R5 and R9, how can i do BGP with client, Ibgp or eBGP ? thanks.
I have ospf for internal reachability.
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ASKER
Thank you for the detailed explanation, this will help me plan my network. I am going set a design on paper and then implement it.
Thanks again.
Thanks again.
Typically, I configure eBGP on each router to its external peer and all routers with eBGP peering sessions have an iBGP session between each other.
Everything else is OSPF.
You have 9 eBGP peering sessions?