Re: BGP Regular Expressions (Originated AS Expressions)
Just a few remarks to what Harold wrote:
With regular expressions the router treats the AS path like a text string.
_ (underscore) searches for space, begin of string, end of string ... anything except numbers
^ means begin of string, so ^4 means an AS path starting with 4 (this includes 4 or 4123)
$ means end of string, so 1$ means f.e. "4321" or "3123 1"
When writing filters keep in mind that the originating AS will be at the end of the AS path and the AS you learn a prefix from will be the first in the AS path. Another thing to keep in mind is that due to AS path prepending any AS number could occur more than once.
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.