Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manuel d'utilisateur télécharger pdf (Page 137)

Configuring BGP Accept and Announce Policies

308628-15.0 Rev 00

5-27

Configuring BGP-4 AS Path Pattern-Matching

Table 5-7 describes the special characters used in the Nortel Networks

implementation of AS path pattern-matching.

Table 5-7. 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

. (period) Matches any single character, including white space

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

_ Matches exactly the AS specified by

Matches the AS pattern beginning with

(for example, “_99”

matches 99, 991, 9934)

_ Matches the AS pattern ending with

(for example, “99_” matches

99,199, 23299)

1 2 ... 132 133 134 135 136 137 138 139 140 141 142 ... 275 276

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Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manuel d'utilisateur Page 137