11-04-2021 10:15 AM - last edited on 01-01-2023 08:17 PM by Translator
I have a customer, who uses the same BGP AS for all of their sites(AS 65002). These sites only peer with the ISP MPLS(AS 65001). How does the ISP AS 65001, advertise routes learned from all the peers, to each other?
I'm trying to replicate it in my lab, but am unable.
Here is a sample configuration, as configured in the wild(With the exception of the ISP, that's the part I'm trying to figure out)
Remote 1
router bgp 65002
bgp log-neighbor-changes
redistribute connected
neighbor 172.16.1.6 remote-as 65001
Remote 2
router bgp 65002
bgp log-neighbor-changes
redistribute connected
neighbor 172.16.1.10 remote-as 65001
HUB 1
router bgp 65002
bgp log-neighbor-changes
redistribute connected
redistribute static
neighbor 172.16.1.2 remote-as 65001
ISP
router bgp 65001
bgp router-id interface Loopback0
bgp log-neighbor-changes
redistribute connected
neighbor 172.16.1.1 remote-as 65002
neighbor 172.16.1.5 remote-as 65002
neighbor 172.16.1.9 remote-as 65002
default-information originate
Disregard the link between R1 and R2.
Solved! Go to Solution.
11-04-2021 11:21 AM - last edited on 01-01-2023 08:20 PM by Translator
Hi @David Rollins ,
On the SP side, this is normally done using the
as-override
configuration, which will replace the customer ASN with the SP ASN.
ISP:
router bgp 65001
neighbor 172.16.1.1 remote-as 65002
neighbor 172.16.1.1 as-override
neighbor 172.16.1.5 remote-as 65002
neighbor 172.16.1.5 as-override
neighbor 172.16.1.9 remote-as 65002
neighbor 172.16.1.9 as-override
This is normally done in a VRF context as the SP offers a MPLS L3VPN service.
Regards,
11-04-2021 11:21 AM - last edited on 01-01-2023 08:20 PM by Translator
Hi @David Rollins ,
On the SP side, this is normally done using the
as-override
configuration, which will replace the customer ASN with the SP ASN.
ISP:
router bgp 65001
neighbor 172.16.1.1 remote-as 65002
neighbor 172.16.1.1 as-override
neighbor 172.16.1.5 remote-as 65002
neighbor 172.16.1.5 as-override
neighbor 172.16.1.9 remote-as 65002
neighbor 172.16.1.9 as-override
This is normally done in a VRF context as the SP offers a MPLS L3VPN service.
Regards,
11-04-2021 11:40 AM - last edited on 01-01-2023 08:21 PM by Translator
For those of you viewing and wondering, it was the following command on the ISP router.
neighbor x.x.x.x as-override
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