Operation Manual – Routing ProtocolH3C S7500 Series Ethernet Switches Chapter 7 IP Routing Policy Configuration7-8By default, no AS path list is defined.7.2.4 Configuring a Community ListIn BGP, community attributes are optional transit attributes. Some communityattributes are globally recognized and they are called standard community attributes.Some are for special purposes and they can be customized.A route can have one or more community attributes. The speaker of multiplecommunity attributes of a route can act based on one, multiple or all attributes. Arouter can decide whether to change community attributes before forwarding a routeto peers.A community list is used to identify community information. It falls in to two types:basic community list and advanced community list. The former ranges from 1 to 99,and the latter ranges from 100 to 199.Follow these steps to configure a community list:To do... Use the command... RemarksEnter system view system-view —Configure a basiccommunity listip community-listbasic-comm-list-number { permit | deny }[ aa:nn | internet | no-export-subconfed |no-advertise | no-export ]*OptionalConfigure anadvancedcommunity listip community-list adv-comm-list-number{ permit | deny } comm-regular-expression OptionalBy default, no BGP community list is defined.7.2.5 Applying a Routing Policy to Import RoutesA routing protocol can import the routes discovered by other routing protocols toenrich its route knowledge. During route import, you can adopt a route-policy to filterrouting information, so as to import only needed routes. If the destination routingprotocol cannot directly use the cost of the source routing protocol, you should specifya cost for the imported routes.Note:The import-route command (used to import routes) is somewhat different in form indifferent routing protocol views. Refer to the import-route command descriptionunder routing protocols in the command manual.
