Cisco CCNA Study Guide - Router Alley

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CCNA Study Guide v2.62 – Aaron Balchunas 188 RIP Neighbors Recall that RIPv1 sends out its updates as broadcasts, whereas RIPv2 sends out its updates as multicasts to the 224.0.0.9 address. We can configure specific RIP neighbor commands, which will allow us to unicast routing updates to those neighbors. On Router B: RouterB(config)# router rip RouterB(config-router)# network 10.3.0.0 RouterB(config-router)# network 10.4.0.0 RouterB(config-router)# neighbor 10.3.5.1 RouterB(config-router)# neighbor 10.4.5.1 Router B will now unicast RIP updates to Router A and Router C. However, Router B will still broadcast (if RIPv1) or multicast (if RIPv2) its updates, in addition to sending unicast updates to its neighbors. In order to prevent broadcast/multicast updates, we must also use passive interfaces: RouterB(config)# router rip RouterB(config-router)# passive-interface s0 RouterB(config-router)# passive-interface s1 RouterB(config-router)# neighbor 10.3.5.1 RouterB(config-router)# neighbor 10.4.5.1 The passive-interface commands prevent the updates from being broadcasted or multicasted. The neighbor commands still allow unicast updates to those specific neighbors. * * * All original material copyright © 2013 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
CCNA Study Guide v2.62 – Aaron Balchunas 189 Interoperating between RIPv1 and RIPv2 Recall that, with some configuration, RIPv1 and RIPv2 can interoperate. By default: • RIPv1 routers will sent only Version 1 packets • RIPv1 routers will receive both Version 1 and 2 updates • RIPv2 routers will both send and receive only Version 2 updates If Router A is running RIP v1, and Router B is running RIP v2, some additional configuration is necessary. Either we must configure Router A to send Version 2 updates: RouterA(config)# interface s0 RouterA(config-if)# ip rip send version 2 Or configure Router B to accept Version 1 updates. RouterB(config)# interface s0 RouterB(config-if)# ip rip receive version 1 Notice that this is configured on an interface. Essentially, we’re configuring the version of RIP on a per-interface basis. We can also have an interface send or receive both versions simultaneously: RouterB(config)# interface s0 RouterB(config-if)# ip rip receive version 1 2 We can further for RIPv2 to send broadcast updates, instead of multicasts: RouterB(config)# interface s0 RouterB(config)# ip rip v2-broadcast * * * All original material copyright © 2013 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
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