Re: Comcast route server not reflecting their reality

Unlike AS2914 which purely interconnects with AS7922, it seems that AS3356 also has direct interconnections to the various Comcast subsidiary networks which are hidden from the DFZ through no-export communities.

I'm curious how this works and why it's done this way. I have a friend who has transit from AS7922 (the remote AS in his BGP sessions are all 7922), but CenturyLink's looking glass shows an AS path of "33657 <his ASN>" and includes the no-export community. Why is the AS path rewritten? What is the design here? -Ross