Need some advice on the best way to implement the attached.
So R1A and R1B will be advertising their local networks (10.0.10.0/24 and 10.0.20.0/24) There is a 100Mb interconnect between R2A and R2B and then somewhere within the MPLS cloud there is another 30Mb link which is the backup
Now I want to run my IGP as OSPF, R2A and R2B will be sending out a default route via OSPF, the routers within the "cloud" should pick up their default gateways automatically via metrics, weights etc. However the problem that I have is that if R2A dies, R1A will still be advertising 10.0.10.0/24. So traffic will go out via R1B but try to get back in via R1A. How can I get around this problem?
The second problem is that I do not know the best way to connect R1A with R2A, should I expand my OSPF area 0 to R1A or use a default route with something like IP SLA?
Ah OK, I see where you are going with that. At the moment its just network x.x.x.x mask x.x.x.x but I guess I could redistribute my OSPF subnets into BGP and filter them with route-maps...would that work? If it would then what relationship do you think R1A and R2A should have? Is the above also vulnerable to route flapping to my upstream provider?
I should also mention that my 2 upstream transit providers provide me with a default route only.
Yes, redistributing OSPF subnets with careful filtering with route-maps will work. This will directly translate the advertisement or withdrawal of your internal networks based upon OSPF advertisements. You may tune BGP dampening parameters as well.
Otherwise, you can keep the existing configuration (network xxx) as it is and utilize the BGP conditional advertisement of 10.x.x.x by tracking the reachability to R2A.
DMVPN (Dynamic Multipoint VPN) Introduced by Cisco in late 2000 is a routing technology you can use to build a VPN network with multiple sites (spokes) without having to statically configure all devices. It’s a “hub and spoke” network, where the spok...
On 24th August 2021, Cisco announced the latest IOS XE release - Cisco IOS XE Bengaluru 17.6.1a
IOS XE 17.6.1a unlocks various routing features and enhancements comprehensively covering different technology segments such as voice, security,...
DMVPN (Dynamic Multipoint VPN) Introduced by Cisco in late 2000 is a routing technology you can use to build a VPN network with multiple sites (spokes) without having to statically configure all devices. It’s a “hub and spoke” network, where th...
SummaryRequirementsConfiguration StepsVerificationFAQTroubleshootingReferences & Tools
In the past when IOS 12.x was hot stuff we used MD5 to authenticate OSPF neighbors. This worked great on ethernet networks because OSPF is a m...
Chapter 1 – Pre-requisite
You have Root or Super Users access privileges of Cisco Prime Infrastructure.
You have access credentials of Cisco DNA Center.
You use Cisco Prime Infrastructure version 3.5 and above which is compatible with Cisco DNA Center v...