BigIron RX Series Configuration Guide 87153-1001986-01Configuring IPv4 address family route parameters 28NOTEThis feature requires the presence of a default route in the IPv4 route table.To enable the device to advertise a default route that is originated a Level 2, enter the followingcommand at the IPv4 IS-IS unicast address family configuration level.BigIron RX(config-isis-router-ipv4u)# default-information-originateThis command enables the device to advertise a default route into the IPv4 IS-IS area to which thedevice is attached.Syntax: [no] default-information-originate [route-map ]The route-map parameter allows you to specify the level on which to advertise the defaultroute. You can specify one of the following:• Advertise to Level-1 ISs only.• Advertise to Level-2 ISs only.• Advertise to Level-1 and Level-2 ISs.NOTEThe route map must be configured before you can use the route map as a parameter with thedefault-information-originate command.To use a route map to specify the router to advertise a default route to Level 1, enter commandssuch as the following at the Global CONFIG level.BigIron RX(config)# route-map default_level1 permit 1BigIron RX(config-routemap default_level1)# set level level-1BigIron RX(config-routemap default_level1)# exitBigIron RX(config)# router isisBigIron RX(config-isis-router)# address-family ipv4 unicastBigIron RX(config-isis-router-ipv4u)# default-information-originate route-mapdefault_level1These commands configure a route map to set the default advertisement level to Level 1 only.Syntax: [no] route-map permit | deny Syntax: [no] set level level-1 | level-1-2 | level-2For this use of a route map, use the permit option and do not specify a match statement. Specify aset statement to set the level to one of the following:• level-1 – Level 1 only.• level-1-2 – Level 1 and Level 2.• level-2 – Level 2 only (default).Changing the administrative distance for IPv4 IS-ISWhen the device has paths from multiple routing protocols to the same destination, it comparesthe administrative distances of the paths and selects the path with the lowest administrativedistance to place in the IPv4 route table.
