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Configuring BGP Services
117356-A Rev. A 8-53
Configuring a BGP-4 AS Pattern-Matching Policy
Table 8-3 describes the special characters used in the Bay Networks
implementation of AS pattern-matching.
Table 8-3. Characters in AS Path Pattern-Matching
Symbol or
Operator
Meaning
< Denotes the beginning of an AS SEQUENCE segment
> Denotes the end of an AS SEQUENCE segment
{ Denotes the beginning of an AS SET segment
} Denotes the end of an AS SET segment
<
seq
>{
set
} Denotes an AS path containing a sequence in the first segment and
a set in the second segment
^ Denotes the following pattern occurs at the beginning of the AS path
$ Denotes the preceding pattern occurs at the end of the AS path
| Denotes logical OR - match this or that
_
X
_ Match exactly AS =
X
_
X
Match AS pattern beginning with
X
(for example, “_99” matches 99,
991, 9934)
X
_ Match AS pattern ending with
X
(for example, “99_” matches 99,199,
23299)
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