BigIron RX Series Configuration Guide 77953-1001986-01Using a table map to set the tag value 26The metric parameter changes the metric. You can specify a value from 0 – 4294967295.The defaultis 0.The route-map parameter specifies a route map to be consulted before adding thestatic route to the BGP4 route table.The route map you specify must already be configured on the router. Refer to “Defining route maps”on page 791 for information about defining route maps.Using a table map to set the tag valueRoute maps that contain set statements change values in routes when the routes are accepted bythe route map. For inbound route maps (route maps that filter routes received from neighbors),this means that the routes are changed before they enter the BGP4 route table.For tag values, if you do not want the value to change until a route enters the IP route table, you canuse a table map to change the value. A table map is a route map that you have associated with theIP routing table. The device applies the set statements for tag values in the table map to routesbefore adding them to the route table.To configure a table map, you configure the route map, then identify it as a table map. The tablemap does not require separate configuration. You create it simply by calling an existing route mapa table map. You can have one table map.NOTEUse table maps only for setting the tag value. Do not use table maps to set other attributes. To setother route attributes, use route maps or filters.To create a route map and identify it as a table map, enter commands such as following. Thesecommands create a route map that uses an address filter. For routes that match the IP prefix listfilter, the route map changes the tag value to 100. This route map is then identified as a table map.As a result, the route map is applied only to routes that the device places in the IP route table. Theroute map is not applied to all routes. This example assumes that IP prefix list p11 has alreadybeen configured.BigIron RX(config)# route-map TAG_IP permit 1BigIron RX(config-routemap TAG_IP)# match ip address prefix-list p11BigIron RX(config-routemap TAG_IP)# set tag 100BigIron RX(config-routemap TAG_IP)# router bgpBigIron RX(config-bgp)# table-map TAG_IPChanging the keep alive time and hold timeThe Keep Alive Time specifies how frequently the router will send KEEPALIVE messages to its BGP4neighbors. The Hold Time specifies how long the router will wait for a KEEPALIVE or UPDATEmessage from a neighbor before concluding that the neighbor is dead. When the router concludesthat a BGP4 neighbor is dead, the router ends the BGP4 session and closes the TCP connection tothe neighbor.The default Keep Alive time is 60 seconds. The default Hold Time is 180 seconds.
