Dell S4048T, Configuration Manual

Page: 242 / 1277

CONFIG-ROUTER-BGP mode
neighbor { ip-address | peer-group-name } filter-list as-path-name {in | out}
If you assign an non-existent or empty AS-PATH ACL, the software allows all routes.
Example of the
show ip bgp paths
Command
To view all BGP path attributes in the BGP database, use the
show ip bgp paths
command in EXEC
Privilege mode.
Dell#show ip bgp paths
Total 30655 Paths
Address Hash Refcount Metric Path
0x4014154 0 3 18508 701 3549 19421 i
0x4013914 0 3 18508 701 7018 14990 i
0x5166d6c 0 3 18508 209 4637 1221 9249 9249 i
0x5e62df4 0 2 18508 701 17302 i
0x3a1814c 0 26 18508 209 22291 i
0x567ea9c 0 75 18508 209 3356 2529 i
0x6cc1294 0 2 18508 209 1239 19265 i
0x6cc18d4 0 1 18508 701 2914 4713 17935 i
0x5982e44 0 162 18508 209 i
0x67d4a14 0 2 18508 701 19878 ?
0x559972c 0 31 18508 209 18756 i
0x59cd3b4 0 2 18508 209 7018 15227 i
0x7128114 0 10 18508 209 3356 13845 i
0x536a914 0 3 18508 209 701 6347 7781 i
0x2ffe884 0 1 18508 701 3561 9116 21350 i
0x2ff7284 0 99 18508 701 1239 577 855 ?
0x2ff7ec4 0 4 18508 209 3561 4755 17426 i
0x2ff8544 0 3 18508 701 5743 2648 i
0x736c144 0 1 18508 701 209 568 721 1494 i
0x3b8d224 0 10 18508 209 701 2019 i
0x5eb1e44 0 1 18508 701 8584 16158 i
0x5cd891c 0 9 18508 209 6453 4759 i
--More--
Regular Expressions as Filters
Regular expressions are used to filter AS paths or community lists. A regular expression is a special character
used to define a pattern that is then compared with an input string.
For an AS-path access list, as shown in the previous commands, if the AS path matches the regular expression
in the access list, the route matches the access list.
The following lists the regular expressions accepted in Dell Networking OS.
Regular
Expression
Definition
^ (caret) Matches the beginning of the input string. Alternatively, when used as the first character
within brackets [^ ], this matches any number except the ones specified within the
brackets.
$ (dollar) Matches the end of the input string.
. (period) Matches any single character, including white space.
Border Gateway Protocol IPv4 (BGPv4) 242