From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Fri Aug 26 2005 - 00:16:12 GMT-3
At 7:46 AM +0800 8/26/05, =?gb2312?B?s8LB1g==?= wrote:
>hi group:
>
>I have a question and need your help:
>
>we rent IP add 85.1.0.0/22 from ISPA before, and we used default
>route to upstream ISP A.
>but now, we applied public AS number and IP address 99.1.0.0/21
>ourself. we are going to BGP connect to Upstream ISP A. I am
>confused with the old IP address 85.1.0.0/22. This IP address block
>is blong to ISP A, if we use BGP connection, this IP address origin
>from our AS number, not from ISPA AS number.
>
>I think it will work fine, but i do not know if it is illegal.how to
>do with it.
>
>thanks.
>
>Woody
You need to coordinate with your upstream such that they stop
originating 85.1.0.0/22 and simply advertise it.
Once that is done, you will announce to ISP A, showing you as originating AS:
85.1.0.0/22
99.1.0.0/21
ISP A will advertise the AS-Paths
You---ISP A---85.1.0.0/22
You---ISP A---99.1.0.0/21
ISP A---its other originated routes
Other AS--ISP A--other routes to which ISP A offers transit
This archive was generated by hypermail 2.1.4 : Sun Sep 04 2005 - 17:01:20 GMT-3