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246 | Border Gateway Protocol IPv4 (BGPv4)
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As seen in Figure 10-27, the expressions are displayed when using the show commands. Use the show
config
command in the CONFIGURATION AS-PATH ACL mode and the show ip as-path-access-list
command in EXEC Privilege mode to view the AS-PATH ACL configuration.
For more information on this command and route filtering, refer to Filter BGP routes.
Redistribute routes
In addition to filtering routes, you can add routes from other routing instances or protocols to the BGP
process. With the
redistribute command syntax, you can include ISIS, OSPF, static, or directly connected
routes in the BGP process.
Use any of the following commands in ROUTER BGP mode to add routes from other routing instances or
protocols.
( ) (parenthesis) Specifies patterns for multiple use when followed by one of the multiplier metacharacters:
asterisk *, plus sign +, or question mark ?
[ ] (brackets) Matches any enclosed character; specifies a range of single characters
- (hyphen) Used within brackets to specify a range of AS or community numbers.
_ (underscore) Matches a ^, a $, a comma, a space, a {, or a }. Placed on either side of a string to specify a
literal and disallow substring matching. Numerals enclosed by underscores can be preceded or
followed by any of the characters listed above.
| (pipe) Matches characters on either side of the metacharacter; logical OR.
Command Syntax Command Mode Purpose
redistribute {connected | static}
[route-map map-name]
ROUTER BGP or
CONF-ROUTER_BGPv6_
AF
Include, directly connected or
user-configured (static) routes in BGP.
Configure the following parameters:
• map-name: name of a configured route
map.
redistribute isis [level-1 | level-1-2 |
level-2] [metric value] [route-map
map-name]
ROUTER BGP or
CONF-ROUTER_BGPv6_
AF
Include specific ISIS routes in BGP.
Configure the following parameters:
• level-1, level-1-2, or level-2: Assign
all redistributed routes to a level.
Default is level-2.
• metric range: 0 to 16777215. Default is
0.
• map-name: name of a configured route
map.
Table 10-4. Regular Expressions
Regular
Expression Definition