Dell S6100 Configuration Manual page 201

To configure an AS-PATH ACL to filter a specific AS_PATH value, use these commands in the following sequence.
1 Assign a name to a AS-PATH ACL and enter AS-PATH ACL mode.
CONFIGURATION mode
ip as-path access-list as-path-name
2 Enter the parameter to match BGP AS-PATH for filtering.
CONFIG-AS-PATH mode
{deny | permit} filter parameter
This is the filter that is used to match the AS-path. The entries can be any format, letters, numbers, or regular expressions.
You can enter this command multiple times if multiple filters are desired.
For accepted expressions, refer to
3 Return to CONFIGURATION mode.
AS-PATH ACL mode
exit
4 Enter ROUTER BGP mode.
CONFIGURATION mode
router bgp as-number
5 Use a configured AS-PATH ACL for route filtering and manipulation.
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
0x4013914 0 3
0x5166d6c 0 3
0x5e62df4 0 2
0x3a1814c 0 26
0x567ea9c 0 75
0x6cc1294 0 2
0x6cc18d4 0 1
0x5982e44 0 162
0x67d4a14 0 2
0x559972c 0 31
0x59cd3b4 0 2
0x7128114 0 10
0x536a914 0 3
0x2ffe884 0 1
0x2ff7284 0 99
0x2ff7ec4 0 4
0x2ff8544 0 3
0x736c144 0 1
0x3b8d224 0 10
0x5eb1e44 0 1
0x5cd891c 0 9
--More--
Regular Expressions as
18508 701 3549 19421 i
18508 701 7018 14990 i
18508 209 4637 1221 9249 9249 i
18508 701 17302 i
18508 209 22291 i
18508 209 3356 2529 i
18508 209 1239 19265 i
18508 701 2914 4713 17935 i
18508 209 i
18508 701 19878 ?
18508 209 18756 i
18508 209 7018 15227 i
18508 209 3356 13845 i
18508 209 701 6347 7781 i
18508 701 3561 9116 21350 i
18508 701 1239 577 855 ?
18508 209 3561 4755 17426 i
18508 701 5743 2648 i
18508 701 209 568 721 1494 i
18508 209 701 2019 i
18508 701 8584 16158 i
18508 209 6453 4759 i
Filters.
Border Gateway Protocol IPv4 (BGPv4) 201