Its indeed a bad idea to prpend AS other than your own AS, the reason is because the traffic could be dropped if AS 253 exist in the path due to BGP split horizon rule.
Traffic will never reach AS 253 if its exist in the path. So its better to prepend your own AS Always. However, prepending could be done more than one time , it depends on the configuration and the requirement.
Prepending is usually done whenever you want to influence the return path. Shortes AS-path is prefered from the upstream and internet IF (Local preference and Weight) are not configured to influence outgoing path selection.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.