Examples: Configuring AS Path Regular Expressions

Exactly match routes with the AS path 1234 56 78 9 and accept them:

[edit]

policy-options {

    wellington "1234 56 78 9";

    policy-statement from-wellington {

        term term1 {

            from as-path wellington;

            }

            then {

                preference 200;

                accept;

            }

        term term2 {

            then reject; 

        }

    }

}

Match alternate paths to an AS and accept them after modifying the preference:

[edit]

policy-options {

    wellington-alternate "1234{1,6} (56|47)? (78|101|112)* 9+";

    policy-statement from-wellington {

        from as-path wellington-alternate; 

        }

        then {

            preference 200;

            accept;

        }

    }

} 

Match routes with an AS path of 123, 124, or 125 and accept them after modifying the preference:

[edit]

policy-options {

    addison "123-125";

    policy-statement from-addison {

        from as-path addison;

        }

        then {

            preference 200;

            accept;

        }

    }

}