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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;
}


}


}

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