Dell PowerConnect W-IAP Remote Configuration Guide - Page 1051

Optional configuration tasks 30 To configure a route map, and use it to set or change route attributes for a network you define for BGP4 to advertise, enter commands such as the following. PowerConnect(config)#route-map set_net permit 1 PowerConnect(config-routemap set_net)#set community no-export PowerConnect(config-routemap set_net)#exit PowerConnect(config)#router bgp PowerConnect(config-bgp-router)#network 100.100.1.0/24 route-map set_net The first two commands in this example create a route map named "set_net" that sets the community attribute for routes that use the route map to "NO_EXPORT". The next two commands change the CLI to the BGP4 configuration level. The last command configures a network for advertising from BGP4, and associates the "set_net" route map with the network. When BGP4 originates the 100.100.1.0/24 network, BGP4 also sets the community attribute for the network to "NO_EXPORT". Syntax: network [route-map ] | [weight ] | [backdoor] The route-map parameter specifies the name of the route map you want to use to set or change BGP4 attributes for the network you are advertising. The route map must already be configured. For information about the other parameters, refer to "Defining route maps" on page 1042. Changing the default local preference When the router uses the BGP4 algorithm to select a route to send to the IP route table, one of the parameters the algorithm uses is the local preference. Local preference is an attribute that indicates a degree of preference for a route relative to other routes. BGP4 neighbors can send the local preference value as an attribute of a route in an UPDATE message. Local preference applies only to routes within the local AS. BGP4 routers can exchange local preference information with neighbors who also are in the local AS, but BGP4 routers do not exchange local preference information with neighbors in remote autonomous systems. The default local preference is 100. For routes learned from EBGP neighbors, the default local preference is assigned to learned routes. For routes learned from IBGP neighbors, the local preference value is not changed for the route. When the BGP4 algorithm compares routes on the basis of local preferences, the route with the higher local preference is chosen. NOTE To set the local preference for individual routes, use route maps. Refer to "Defining route maps" on page 1042. Refer to "How BGP4 selects a path for a route" on page 983 for information about the BGP4 algorithm. To change the default local preference to 200, enter the following command. PowerConnect(config-bgp-router)#default-local-preference 200 Syntax: default-local-preference The parameter indicates the preference and can be a value from 0 through 4294967295. PowerConnect B-Series FCX Configuration Guide 53-1002266-01 1009