Thursday, 14 May 2009 20:19 | 
Written by CiscoNET | 
1. Atom An atom is a single character, such as the following
Matches any single character Matches the beginning of the input string Matches the end of the input string Matches the character Matches a comma (,), left brace ({), right brace (}), the beginning of the input string, the end of the input string, or a space.
.
^
$
\
-
2. Piece A piece is an atom followed by one of the following symbols
Matches 0 or more sequences of the atom Matches 1 or more sequences of the atom Matches the atom or the null string
*
+
?
3. Branch A branch is a 0 or more concatenated pieces
Any occurrence of the letter "a", including none At least one occurrence of the letter "a" should be present) This matches "aa" or "aba" Via AS100 Origin AS100 Coming from AS100 Originated from this AS
a*
a+
ab?a
_100_
^100$
^100 .*
^$
Examples
3-1-1, Filtering bgp output with route only origin from AS7018
Cisco Router#sh ip bgp regexp ^7018$
BGP table version is 199154652, local router ID is x.x.x.x
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i3.51.92.0/23 12.122.126.39 10 100 0 7018 ?
* i 12.122.126.39 10 100 0 7018 ?
*>i12.0.0.0/9 12.122.126.39 10 100 0 7018 i
* i 12.122.126.39 10 100 0 7018 i
*>i12.0.0.0 12.122.126.39 10 100 0 7018 i
:
:
3-1-2, Filtering bgp output with route origin from AS46164
Cisco Router#sh ip bgp regexp _46164$
BGP table version is 199155849, local router ID is x.x.x.x
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
* i4.23.88.0/24 12.122.126.39 10 100 0 7018 46164 i
*>i 12.122.126.39 10 100 0 7018 46164 i
*>i4.23.88.0/23 12.122.126.39 10 100 0 7018 46164 i
:
:
3-2, Filtering bgp output with route pass thru AS46164
Cisco Router#sh ip bgp regexp _6762_
BGP table version is 199165809, local router ID is x.x.x.x
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i2.0.0.0/16 144.228.243.250 10 100 0 1239 6762 12654 i
* i 144.228.243.250 10 100 0 1239 6762 12654 i
*>i2.1.0.0/21 144.228.243.250 10 100 0 1239 6762 12654 i
* i 144.228.243.250 10 100 0 1239 6762 12654 i
:
:
3-4, Filtering bgp output with route only origin from AS1239 and directly attached with AS1239
Cisco Router#sh ip bgp regexp ^1239_[0-9]*$
BGP table version is 199175215, local router ID is x.x.x.x
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i8.3.213.0/24 144.228.243.250 10 100 0 1239 4739 i
* i 144.228.243.250 10 100 0 1239 4739 i
*>i8.10.245.0/24 144.228.243.250 10 100 0 1239 17151 i
* i 144.228.243.250 10 100 0 1239 17151 i
3-5, Filtering bgp output with route origin from AS46164
Cisco Router#sh ip bgp regexp ^1239$
BGP table version is 199175920, local router ID is x.x.x.x
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i12.70.138.0/24 144.228.243.250 10 100 0 1239 i
* i 144.228.243.250 10 100 0 1239 i
*>i12.195.4.0/24 144.228.243.250 10 100 0 1239 i
3-6, Filtering bgp output with route learning from AS1239
Cisco Router#sh ip bgp regexp ^1239_
BGP table version is 199177194, local router ID is x.x.x.x
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i2.0.0.0/16 144.228.243.250 10 100 0 1239 6762 12654 i
* i 144.228.243.250 10 100 0 1239 6762 12654 i
*>i2.1.0.0/21 144.228.243.250 10 100 0 1239 6762 12654 i
3-7, Filtering bgp output with route only direct connected ASs
Cisco Router#sh ip bgp regexp ^[0-9]+$
BGP table version is 199177786, local router ID is x.x.x.x
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i3.51.92.0/23 12.122.126.39 10 100 0 7018 ?
* i 12.122.126.39 10 100 0 7018 ?
*>i4.0.0.0/9 4.68.185.60 10 100 0 3356 i
3-8, Filtering bgp output with route only direct connected ASN with letter 1, 7 and 4
Cisco Router#sh ip bgp regexp ^[174]+$
BGP table version is 199179097, local router ID is x.x.x.x
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i24.238.0.0/24 154.54.13.137 10 100 0 174 i
* i 154.54.13.137 10 100 0 174 i
*>i24.238.2.0/24 154.54.13.137 10 100 0 714 i
* i 154.54.13.137 10 100 0 714 i
3-9, Filtering bgp output with route origin from AS46164 and thru AS7018
Cisco Router#sh ip bgp reg ^7018_46164$
BGP table version is 199190289, local router ID is x.x.x.x
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
* i4.23.88.0/24 12.122.126.39 10 100 0 7018 46164 i
*>i 12.122.126.39 10 100 0 7018 46164 i
*>i4.23.88.0/23 12.122.126.39 10 100 0 7018 46164 i
* i 12.122.126.39 10 100 0 7018 46164 i
3-10, Filtering bgp output with route locally origin
Cisco Router#sh ip bgp reg ^$
BGP table version is 199192287, local router ID is x.x.x.x
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i4.68.62.96/30 140.222.130.48 100 0 i
* i 140.222.130.48 100 0 i
*>i4.68.63.140/30 140.222.130.48 100 0 i
* i 140.222.130.48 100 0 i
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Last Updated (Thursday, 25 March 2010 17:48)
