match as-path

Use this command to match a packet against its AS path attribute.

Syntax

match as-path as-path-string

no match as-path as-path-string

Parameters

as-path-string

Specifies a string value to match against this packets AS path attribute.

Defaults

None.

Mode

BGP route map configuration.

Usage

The match as-path command supports the following regular expressions:

^ - start of string (eg ^200 matches any string starting with 200)
$ - end of string (eg 200$ matches any string ending with 200)
. - matches any character (eg 2.0 match 200, 210, 220, etc)
* - matches preceding element zero or more times (eg 22* matches 2, 22, 222, etc)
.* - matches any character any number of times (i.e. this is a match all)
[] - match a single character inside the brackets
[-] - denotes a range (eg [0-9] matches any number from 0 to 9)
() - a subexpression (eg (200:500) is treated as a single entity).
[^] - match any single character not in brackets.
? - match preceding element zero or one time.
+ - match preceding element one or more times.
| - choice operator matches either expression before or after operator.

The no match as-path command removes the match clause from this route map.

Example

This example shows how to match a packet AS path attribute that starts with AS number 20313 and with the next AS number ending with 13:

System(su)->configure
System(su-config)->route-map bgp bgprm1 permit
System(su-config-route-map-bgp)->match as-path ^20313.*13$
System(su-config-route-map-bgp)->show route-map bgprm1
 route-map bgp bgprm1 permit 10
  match afi ipv6
  match safi unicast
  match as-path "^20313_$13"
System(su-config-route-map-bgp)->

Published May 2016prev | next

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