Hello,
I’m doing a simple Lab to understand the LOOP caused by configuring different Site-Of-Origins (SoO) with BGP in Multihomed sites.
The following scheme demonstrates what I did : 3 PEs with MPLS implemented between them. PE-1 is connected to CE-1 with eBGP. PE-2 is connected to CE-2 with eBGP.
I did a loop by connecting the two CEs with a direct Link using (iBGP).
The MPLS Backbone is in its own AS. The 3 sites (PE-1, PE-2 et PE-3) are connecting CEs in another unique AS. SO I used the AS-Override command 😊
My Problem : I didn’t obtain a LOOP Problem as I expected (I didn’t configure soo in PE-1 and PE-2 with their CEs neighbors) and the Ping connectivity from LAN X to LAN Y is working well !
Could you explain to me why ? Is the LOOP not obligatory or happening only in some cases ?
Thanks in advance.
Regards.
