08-21-2011 03:18 AM - edited 03-04-2019 01:20 PM
Hi,
Scenario:
My topology diagram is attached. Please note the following:
MPLS/BGP Link to Head Office.
Diagram:
Config:
For example, Branch_1 router interfaces would look something like this:
F0/0 -- LAN -- ip address/24 -- OSPF Area 1
F0/1 -- VSAT Device -- ip address/29 (non-routed)
S0/0 -- MPLS/BGP -- ip address/30
BRI0/0 -- ISDN Line
Dialer 1 -- ISDN to Regional Office (RO) -- ipaddress/30 -- OSPF Area 1
Dialer 2 -- ISDN to Head Office (HO/DC) -- ipaddress/30 -- OSPF Area 0
Tunnel 1 -- GRE Tunnel running over VSAT to Head Office (HO/DC) -- ipaddress/30 -- OSPF Area 0
The branch basically becomes a stub node when both link 1 & 2 are down (MPLS and ISDN).
Goal: My goal is to tune OSPF on the VSAT link in such a way that minimal routing traffic is sent and the OSPF converges very quickly.
Options worth exploring: I have few solutions that I plan to try , but, I want to double sure on the design part and also future issues that may occur.
Thats all I could come up with. What will be the best method to solve this matter? Looking for some suggestions. Please let me know if more insight or details are needed.
--TIA
Added few more things...
08-21-2011 03:40 AM
Option #5: Put a new router between HO/DC Core Router to act as an ABR. Now put all the VSAT GREs in a new Area 500. Make it a NSSA or originate default route or something clever. However, problem would be getting a new router with enough power, the Backhaul link termination on the new router etc.
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