11-09-2011 03:14 PM - edited 03-04-2019 02:13 PM
Hi how do you configure BGP in the below scenario?
R1/R2 = Customer Router
ISP1
ISP2
R1 connected to ISP1 and ISP2, R2 to ISP1 and ISP2, R1 connected to R2. So far most design and configuration I have seen is R1 to ISP1, R2 to ISP2, R1 to R2.
Thanks
11-09-2011 04:33 PM
frsisqo14344 wrote:
Hi how do you configure BGP in the below scenario?
R1/R2 = Customer Router
ISP1
ISP2
R1 connected to ISP1 and ISP2, R2 to ISP1 and ISP2, R1 connected to R2. So far most design and configuration I have seen is R1 to ISP1, R2 to ISP2, R1 to R2.
Thanks
How much redundancy do you want?
I implemented a similar situation, except I ran a layer two network with a couple of VLAN's between the two routers and VRRP on the ISP interface so that if one router failed the toher would take over and still maintain my BGP adjacency with both ISP's - I also ran an iBGP between the two routers, and had the link to the "inside" vias my firewall running VRRP as well.
If you don't need that kind of redundancy, then your way will work - just run iBGP between the two routers and let them sort out the best route between them.
Cheers.
11-09-2011 10:54 PM
Hi,
Best implementation for the redundancy level you want will be:
On LAN side Configure HSRP
Run iBGP between R1 and R2
and eBGP with ISP.
That if you want normal BGP behaviour. Means it will use any single ISP at the moment for the best routes.
If you want to load balance the things between your 2 ISP, then you need to tweak BGP.
HTH,
Smitesh
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