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4.1 | ![]() |
RIP v2 Overview | |
4.1.4 | ![]() |
Compatibility with RIP v1 |
RIP v2 handles updates in a flexible manner. If the Version Number field
indicates version 1 and if any bits in the Unused field are set to
one, the update is discarded.
![]() RFC 1723 defines a compatibility switch with four settings, which allows versions 1 and 2 to interoperate:
RFC 1723 recommends that switches be configurable on a per-interface basis. The Cisco commands for settings 1 through 3 are presented in the section Configuring RIP v2. The Cisco command for setting 4 is accomplished by using the passive-interface command.Additionally, RFC 1723 defines a receive control switch to regulate the reception of updates. The four recommended settings of this switch are listed in the following:
This switch should also be configurable on a per interface basis. The Cisco commands for settings 1 through 3 are also presented in the configuration section of this module. Setting 4 can be accomplished by using an access list to filter UDP source port 520, by not including a network statement for the interface, or by configuring a route filter.
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