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Configuring BGP
Matches:
Doesn't Match:
^500
Meaning:
Matches:
Doesn't Match:
[100-199]*
Meaning:
500
(900|950)$
Matches:
Doesn't Match:
Some examples of invalid regular expressions are shown in the following table:
Error
Description
66543
Number is too large. AS numbers must be in the range 1 to 65535.
64,512
Possibly an error, if the user meant the number 64512. The comma gets interpreted as
a separator, thus the pattern is equivalent to the two AS numbers 64 and 512.
(100 200 | 300)
Alternation sequences must consist of single AS numbers separated by vertical bars,
enclosed by parentheses.
(100*|200)
No metacharacters other than vertical bars may be included within an alteration
sequence.
(100 |
Parthentheses may not be nested. This pattern is actually equivalent to (100|200|300).
(200|300))
100 ^ 200
The "^" metacharacter must occur first in the pattern, as it matches the beginning of
the AS path.
^500 $600
The "$" metacharacter must occur last in the pattern, as it matches the end of the AS
path.
^? 100
The repetition metacharacters (?,+,*) cannot be applied to the beginning of the line. If
it were legal, this pattern would be equivalent to the pattern: 100.
[1-(8|9)]*
A range cannot contain an alternation sequence.
OmniSwitch AOS Release 7 Advanced Routing Configuration Guide
100 350 501
200 250 260 270 280 600
100 600
100 400 600 700
Only routes consisting of a single AS, 500.
500
500 600
100 500 600
Any route which ends with any number of occurrences of AS num-
bers in the range 100 to 199, followed by 500, followed by either a
900 or 950.
100 150 175 500 900
100 500 950
100 200 500 900
100 199 500
March 2011
BGP Overview
page 3-15
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