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Step
3.
Configure BGP route
distribution filtering policies.
Configuring BGP route reception filtering policies
You can use the following methods to configure BGP route reception filtering policies:
•
Use an ACL or prefix list to filter routing information received from all peers.
•
Use a routing policy, ACL, AS path list, or prefix list to filter routing information received from a
peer or peer group.
If you configure multiple filtering policies, apply them in the following sequence:
1.
filter-policy import
2.
peer filter-policy import
3.
peer as-path-acl import
4.
peer prefix-list import
5.
peer route-policy import
Only routes passing all the configured policies can be received.
To configure BGP route reception filtering policies (IPv4 unicast/multicast address family):
Command
•
Reference an ACL or IPv6
prefix list to filter advertised
BGP routes:
filter-policy
{ ipv6-acl-number |
prefix-list ipv6-prefix-name }
export [ direct | isisv6
process-id | ospfv3
process-id | ripng process-id
| static ]
•
Reference a routing policy to
filter BGP routes advertised
to a peer or peer group:
peer { group-name |
ipv6-address
[ prefix-length ] }
route-policy
route-policy-name export
•
Reference an ACL to filter
BGP routes advertised to a
peer or peer group:
peer { group-name |
ipv6-address
[ prefix-length ] } filter-policy
ipv6-acl-number export
•
Reference an AS path list to
filter BGP routes advertised
to a peer or peer group:
peer { group-name |
ipv6-address
[ prefix-length ] } as-path-acl
as-path-acl-number export
•
Reference an IPv6 prefix list
to filter BGP routes
advertised to a peer or peer
group
peer { group-name |
ipv6-address
[ prefix-length ] } prefix-list
ipv6-prefix-name export
245
Remarks
Use at least one method.
By default, no BGP distribution
filtering policy is configured.
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Troubleshooting
