HP VPN Firewall Appliances Network Management Configuration Guide

927
Configuring routing policies
The term "router" in this document refers to both routers and routing-capable firewalls and firewall
modules.
Routing policy can be configured only at the CLI.
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:
1. Configure filters based on route attributes, such as destination address and the advertising router's
address.
2. Create a routing policy and apply filters to the routing policy.
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 Access Control 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 Network
Management Command Reference.
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."