Controlling Route Distribution and Reception 385
Configuring BGP Route
Reception Filtering
Policies
Follow these steps to configure BGP route reception filtering policies:
n
■ Only routes permitted by the specified filtering policies can they be installed
into the local BGP routing table.
■ Members of a peer group can have different route reception filtering policies
from the peer group.
Configure the filtering of
outgoing redistributed routes
filter-policy { acl-number |
ip-prefix ip-prefix-name }
export [ direct | isis
process-id | ospf process-id |
rip process-id | | static ]
Required to choose any;
Not configured by default;
You can configure a filtering
policy as needed;
If several filtering policies are
configured, they are applied
in the following sequence:
■ filter-policy export
■ peer filter-policy export
■ peer as-path-acl export
■ peer ip-prefix export
■ peer route-policy export
Only routes pass the first
policy, can they go to the
next, and only routes passing
all the configured policies, can
they be advertised.
Reference a routing policy to
filter routes to a peer/peer
group
peer { group-name |
ip-address } route-policy
route-policy-name export
Reference an ACL to filer
routes to a peer/peer group
peer { group-name |
ip-address } filter-policy
acl-number export
Reference an AS path ACL to
filter routing information to a
peer/peer group
peer { group-name |
ip-address } as-path-acl
as-path-acl-number export
Reference an IP prefix list to
filer routing information to a
peer/peer group
peer { group-name |
ip-address } ip-prefix
ip-prefix-name export
To do… Use the command… Remarks
To do… Use the command… Remarks
Enter system view system-view -
Enter BGP view bgp as-number -
Filter incoming routes with an
ACL or IP prefix list
filter-policy { acl-number |
ip-prefix ip-prefix-name }
import
Required to choose any;
No route reception filtering is
configured by default;
You can configure a filtering
policy as needed;
If several filtering policies are
configured, they are applied
in the following sequence:
■ filter-policy import
■ peer filter-policy import
■ peer as-path-acl import
■ peer ip-prefix import
■ peer route-policy import
Only routes passing the first
policy, can they go to the
next, and only routes passing
all the configured policies, can
they be received.
Reference a routing policy to
filter routes from a peer/peer
group
peer { group-name |
ip-address } route-policy
policy-name import
Reference an ACL to filter
routing information from a
peer/peer group
peer { group-name |
ip-address } filter-policy
acl-number import
Reference an AS path ACL to
filter routing information from
a peer/peer group
peer { group-name |
ip-address } as-path-acl
as-path-acl-number import
Reference an IP prefix list to
filter routing information from
a peer/peer group
peer { group-name |
ip-address } ip-prefix
ip-prefix-name import
Specify the maximum number
of routes that can be received
from a peer/peer group
peer { group-name |
ip-address } route-limit limit
[ percentage ]
The number is unlimited by
default.
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