Manipulating Routing Updates,Configuring and Verifying Route Redistribution,Redistribution Supports All Protocols,RtrA(config)#router ripRtrA(config-router)#redistribute ? bgp Border Gateway Protocol (BGP) connected Connected eigrp Enhanced Interior Gateway Routing Protocol (EIGRP) isis ISO IS-IS iso-igrp IGRP for OSI networks metric Metric for redistributed routes mobile Mobile routes odr On Demand stub Routes ospf Open Shortest Path First (OSPF) rip Routing Information Protocol (RIP) route-map Route map reference static Static routes ,Configuring Redistribution into RIP,RtrA(config)# router ripRtrA(config-router)# redistribute ospf ? Process IDRtrA(config-router)# redistribute ospf 1 ? match Redistribution of OSPF routes metric Metric for redistributed routes route-map Route map reference ,Default metric is infinity.,Redistributing into RIP,Configuring Redistribution into OSPF,Default metric is 20.Default metric type is 2.Subnets do not redistribute by default.,RtrA(config)# router ospf 1RtrA(config-router)# redistribute eigrp ? Autonomous system numberRtrA(config-router)# redistribute eigrp 100 ? metric Metric for redistributed routes metric-type OSPF/IS-IS exterior metric type for redistributed routes route-map Route map reference subnets Consider subnets for redistribution into OSPF tag Set tag for routes redistributed into OSPF ,Redistributing into OSPF,Configuring Redistribution into EIGRP,RtrA(config)# router eigrp 100RtrA(config-router)# redistribute ospf ? Process IDRtrA(config-router)# redistribute ospf 1 ? match Redistribution of OSPF routes metric Metric for redistributed routes route-map Route map reference ,Default metric is infinity.,Bandwidth in kilobytes = 10000Delay in tens of microseconds = 100Reliability = 255 (maximum)Load = 1 (minimum)MTU = 1500 bytes,Redistributing into EIGRP,Configuring Redistribution into IS-IS,RtrA(config)# router isisRtrA(config-router)# redistribute eigrp 100 ? level-1 IS-IS level-1 routes only level-1-2 IS-IS level-1 and level-2 routes level-2 IS-IS level-2 routes only metric Metric for redistributed routes metric-type OSPF/IS-IS exterior metric type for redistributed routes route-map Route map reference . Output Omitted,Routes are introduced as Level 2 with a metric of 0 by default.,Redistributing into IS-IS,Example: Before Redistribution,Example: Before Redistribution (Cont.),Example: Configuring Redistribution at Router B,Example: Routing Tables After Route Redistribution,Example: Routing Tables After Summarizing Routes and Redistributions,Summary,Several steps must be followed for accurate IP route redistribution to occur.All IP routing protocols can be redistributed into RIP.When IP routing protocols are redistributed into OSPF, additional commands are required.When IP routing protocols are redistributed into EIGRP, a seed metric is required.IP routing protocols are usually redistributed into IS-IS as Level 2 routes.There are several techniques for verifying IP route redistribution.,Manipulating Routing Updates,Controlling Routing Update Traffic,Using the passive-interface Command,Controlling Routing Update Traffic,distribute-list accesslist-number | name out interfacename | routingprocess routing-process parameter,Router(config-router)#,Configuring distribute-list,distribute-list accesslist-number | name | route-map map-tag in interface-type interface-number,Router(config-router)#,Use an access list (or route map) to permit or deny routes.Can be applied to transmitted, received, or redistributed routing updates.,For outbound updates:,For inbound updates:,Hides network 10.0.0.0 using interface filtering,Filtering Routing Updates with a Distribute List,Controlling Redistribution with Distribute Lists,Route Maps,Route maps are similar to a scripting language for these reasons:They work like a more sophisticated access list.They offer top-down processing.Once there is a match, leave the route map.Lines are sequence-numbered for easier editing.Insertion of linesDeletion of linesRoute maps are named rather than numbered for easier documentation.Match criteria and set criteria can be used, similar to the “if, then” logic in a scripting language.,Route Map Applications,The common uses of route maps are as follows:Redistribution route filtering: a more sophisticated alternative to distribute listsPolicy-based routing: the ability to determine routing policy based on criteria other than the destination networkBGP policy implementation: the primary tool for defining BGP routing policies,route-map my_bgp permit 10 match statements match statements set statements set statements route-map my_bgp deny 20 : : : :route-map my_bgp permit 30 : : : :,