Defining neighbor distribute lists
A neighbor distribute list is a list of BGP4 address filters or ACLs that filter the traffic to or from a neighbor.
To configure a distribute list that uses ACL 1, enter a command such as the following.
device(config-bgp)# neighbor 10.10.10.1 distribute-list 1 in
This command configures the device to use ACL 1 to select the routes that the device will accept from neighbor 10.10.10.1.
Syntax:
[no] neighbor
ip-addr
distribute-list
name-or-num
in
|
out
The
ip-addr
parameter specifies the neighbor.
The
name-or-num
parameter specifies the name or number of a standard or named ACL.
The
in
and
out
parameters specify whether the distribute list applies to inbound or outbound routes:
•
in
- controls the routes the device will accept from the neighbor.
•
out
- controls the routes sent to the neighbor.
Defining route maps
A route map is a named set of match conditions and parameter settings that the device can use to modify route attributes and to control
redistribution of the routes into other protocols. A route map consists of a sequence of instances . If you think of a route map as a table,
an instance is a row in that table. The device evaluates a route according to route map instances in ascending numerical order. The route
is first compared against instance 1, then against instance 2, and so on. When a match is found, the device stops evaluating the route.
Route maps can contain match clauses and
set
statements. Each route map contains a
permit
or
deny
action for routes that match the
match clauses:
•
If the route map contains a
permit
action, a route that matches a match statement is permitted; otherwise, the route is denied.
•
If the route map contains a
deny
action, a route that matches a match statement is denied.
•
If a route does not match any match statements in the route map, the route is denied. This is the default action. To change the
default action, configure the last match statement in the last instance of the route map to
permit any any
.
•
If there is no match statement, the software considers the route to be a match.
•
For route maps that contain address filters, AS-path filters, or community filters, if the action specified by a filter conflicts with
the action specified by the route map, the route map action takes precedence over the filter action.
If the route map contains set clauses, routes that are permitted by the route map match statements are modified according to the set
clauses.
Match statements compare the route against one or more of the following:
•
The route BGP4 MED (metric)
•
A sequence of AS-path filters
•
A sequence of community filters
•
A sequence of address filters
•
The IP address of the next hop device
•
The route tag
•
For OSPF routes only, the route type (internal, external type-1, or external type-2)
•
An AS-path ACL
•
A community ACL
Filtering
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