> Hello,
> Can any explain what these EXACTLY mean?
>
> ip as-path access-list 1 permit _109_

Matches any prefix that passed through AS 109.

> ip as-path access-list 2 permit _200$

Matches any prefix that originated in AS 200.

> ip as-path access-list 2 permit ^100$

Matches any prefix that only has AS 100 in the AS path.  This would assume
that AS100 is directly adjacent and the prefix originated there.

It would probably be helpful for you to learn about BGP regular expressions.
Do a search on Google using the terms "unix regular expressions" and you'll
find plenty of information that should clarify their use.

Good luck,
John




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