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Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
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Chapter 38 Configuring IP Unicast Routing
Configuring Protocol-Independent Features
a criterion must be matched. The
set
command specifies an action to be taken if the routing update meets
the conditions defined by the match command. Although redistribution is a protocol-independent
feature, some of the
match
and
set
route-map configuration commands are specific to a particular
protocol.
One or more
match
commands and one or more
set
commands follow a
route-map
command. If there
are no
match
commands, everything matches. If there are no
set
commands, only the match action
occurs. Therefore, you need at least one
match
or
set
command.
Note
A route map with no
set
route-map configuration commands is sent to the CPU, which causes high CPU
utilization.
You can also identify route-map statements as
permit
or
deny
. If the statement is marked as a deny, the
packets meeting the match criteria are sent back through the normal forwarding channels
(destination-based routing). If the statement is marked as a permit, set clauses are applied to packets
meeting the match criteria. Packets that do not meet the match criteria are forwarded through the normal
routing channel.
You can use the BGP route map
continue
clause to execute additional entries in a route map after an
entry is executed with successful match and set clauses. You can use the
continue
clause to configure
and organize more modular policy definitions so that specific policy configurations are not repeated
within the same route map. The switch supports the
continue
clause for outbound policies. For more
information about using the route map
continue
clause, see the BGP Route-Map Continue Support for
an Outbound Policy feature guide for Cisco IOS Release 12.4(4)T at this URL:
http://www.cisco.com/en/US/products/ps6441/products_feature_guides_list.html
Note
Although each of Steps 3 through 14 in the following section is optional, you must enter at least one
match
route-map configuration command and one
set
route-map configuration command.
Beginning in privileged EXEC mode, follow these steps to configure a route map for redistribution:
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
route-map
map-tag
[
permit
|
deny
] [
sequence number
] Define any route maps used to control redistribution, and
enter route-map configuration mode.
map-tag
—A meaningful name for the route map. The
redistribute
router configuration command uses this
name to reference this route map. Multiple route maps
can share the same map tag name.
[
permit
|
deny
] (Optional)—If
permit
is specified and
the match criteria are met for this route map, the route is
redistributed as controlled by the set actions. If
deny
is
specified, the route is not redistributed.
sequence number
(Optional)—Number that defines the
position a new route map is to have in the list of route
maps already configured with the same name.
Step 3
match as-path
path-list-number
Match a BGP autonomous-system path access list.
Step 4
match community-list
community-list-number
[
exact
]
Match a BGP community list.
