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10.6 Sending Version 1 Update Messages<br />

Problem<br />

You want your router to send route updates that can be understood by legacy RIP<br />

Version 1 devices.<br />

Solution<br />

You configure RIP to send update messages that the RIP Version 1 routers can<br />

understand:<br />

[edit protocols]<br />

aviva@RouterA# set rip group alpha-rip-group neighbor fe-0/0/0 send broadcast<br />

<strong>Discussion</strong><br />

When you enable RIP on an interface, the router receives both RIP Version 1 and<br />

Version 2 update messages but sends only RIP Version 2 updates. If you have devices<br />

in your network that are still using RIP Version 1, you want them to be able to<br />

receive update messages. The send broadcast configuration statement sets RIP to<br />

send both Version 1 and Version 2 update packets.<br />

When you look at the RIP interfaces now, you see that the send mode for interface<br />

fe-/0/00 has changed from mcast to bcast:<br />

aviva@RouterA> show rip neighbor fe-0/0/0<br />

Source Destination Send Receive In<br />

Neighbor State Address Address Mode Mode Met<br />

-------- ----- ------- ----------- ---- ------- ---<br />

fe-0/0/0.0 Up 10.0.16.1 10.0.16.255 bcast both 1<br />

You can verify that the neighboring router is receiving RIP Version 1 updates by issuing<br />

the show rip statistics command on the RIP neighbor:<br />

aviva@RouterE> run show rip statistics fe-1/0/0.0<br />

RIPv2 info: port 520; update interval 30s; holddown 180s; timeout 120s.<br />

rts learned rts held down rqsts dropped resps dropped<br />

18 0 0 0<br />

fe-1/0/0.0: 4 routes learned; 17 routes advertised<br />

Counter Total Last 5 min Last minute<br />

------- ----------- ----------- -----------<br />

Updates Sent 2690 11 2<br />

Triggered Updates Sent 10 0 0<br />

Responses Sent 0 0 0<br />

Bad Messages 2 1 1<br />

RIPv1 Updates Received 2 1 1<br />

RIPv1 Bad Route Entries 0 0 0<br />

RIPv1 Updates Ignored 0 0 0<br />

RIPv2 Updates Received 2753 10 1<br />

RIPv2 Bad Route Entries 57 0 0<br />

Sending Version 1 Update Messages | 345<br />

This is the Title of the Book, eMatter Edition<br />

Copyright © 2008 O’Reilly & Associates, Inc. All rights reserved.

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