876 BigIron RX Series Configuration Guide53-1001986-01Configuring ISIS properties on an interface28Redistributing IPv4 IS-IS routes within IPv4 IS-ISIn addition to redistributing routes from other route sources into IPv4 IS-IS, the BigIron RX canredistribute Level 1 IPv4 IS-IS routes into Level 2 IPv4 IS-IS routes, and Level 2 IPv4 IS-IS routes intoLevel 1 IPv4 IS-IS routes. By default, the device redistributes routes from Level 1 into Level 2.NOTEThe BigIron RX automatically redistributes Level 1 routes into Level 2 routes, even if you do notenable redistribution.For example, to redistribute all IPv4 IS-IS routes from Level 2 into Level 1, enter the followingcommand at the IPv4 IS-IS unicast address family configuration level.BigIron RX(config-isis-router-ipv4u)# redistribute isis level-2 into level-1The router automatically redistributes Level-1 routes into Level 2.Syntax: [no] redistribute isis level-1 into level-2 | level-2 into level-1 [prefix-list ]The level-1 into level-2 | level-2 into level-1 parameter specifies the direction of the redistribution:• level-1 into level-2 – Redistributes Level 1 routes into Level 2. This is the default.• level-2 into level-1 – Redistributes Level 2 routes into Level 1.The prefix-list specifies an IP prefix list. To configure an IP prefix list, refer to the EnterpriseConfiguration and Management Guide.Configuring ISIS properties on an interfaceThis section describe the IS-IS parameters for an interface.Disabling and enabling IS-IS on an interfaceIn addition to enabling IS-IS globally, you also must enable the protocol on the individual interfacesconnected to ISs or ESs. To enable IS-IS locally on specific interfaces, enter commands such as thefollowing.BigIron RX(config)# interface ethernet 1/1BigIron RX(config-if-1/1)# ip router isisBigIron RX(config-if-1/1)# exitBigIron RX(config)# interface ethernet 1/2BigIron RX(config-if-1/2)# ip router isisThese commands enable IS-IS on ports 1/1 and 1/2. The NET configured above (at the IS-ISconfiguration level) applies to both interfaces.Syntax: [no] ip router isisDisabling or re-enabling formation of adjacenciesWhen you enable IS-IS on any type of interface except a loopback interface, the interface also isenabled to send advertisements and form an adjacency with an IS at the other end of the link bydefault. Adjacency formation and advertisements are disabled by default on loopback interfaces.You can enable or disable adjacency formation and advertisements on an interface.
