Configuring Routing Policies; Overview; Filters - HPE FlexNetwork HSR6800 Configuration Manual

Configuring routing policies

Routing policies control routing paths by filtering and modifying routing information. This chapter
describes both IPv4 and IPv6 routing policies.

Overview

Routing policies can filter advertised, received, and redistributed routes, and modify attributes for
specific routes.
To configure a routing policy:
Configure filters based on route attributes, such as destination address and the advertising
1.
router's address.
Create a routing policy and apply filters to the routing policy.
2.

Filters

The filters that routing protocols can use to filter routes include ACL, IP prefix list, AS path list,
community list, extended community list, and routing policy. These filters cannot work alone. They
must be referenced by specific commands to take effect. A routing policy can use all the other filters
as its own match criteria.
ACL
ACLs include IPv4 ACLs and IPv6 ACLs. An ACL can match the destination or next hop of routing
information.
For more information about ACL, see ACL and QoS Configuration Guide.
IP prefix list
IP prefix lists include IPv4 prefix lists and IPv6 prefix lists.
An IP prefix list matches the destination address of routing information. You can use the gateway
option to receive routing information only from specified routers. For gateway option information,
see "Configuring RIP" and "Configuring OSPF."
An IP prefix list, identified by name, can comprise multiple items. Each item, identified by an index
number, specifies a prefix range to match. An item with a smaller index number is matched first. A
route that matches one item matches the IP prefix list.
AS path list
An AS path list matches the AS-PATH attribute of BGP routing information.
For more information about AS path list, see "Configuring BGP."
Community list
A community list matches the community attribute of BGP routing information.
For more information about community list, see "Configuring BGP."
Extended community list
An extended community list matches the extended community attribute (Route-Target for VPN and
Source of Origin) of BGP routing information.
For more information about extended community list, see MPLS Configuration Guide.
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