RIP-1 and RIP-2 can be run together in a network. You should be aware of a few things when running both protocols in your network:
• Autosummarization? RIP-1 and RIP-2 can be run together in a network. RFC 1723 for RIP-2 recommends disabling the autosummarization feature when using both RIP-1 and RIP-2.
• Subnet advertisement ? If a more specific subnet is advertised to a RIP-1 router, the router might mistakenly take it as a host route update.
• Queries ? When a RIP-2 router receives a query request from a RIP-1 router, it responds with a RIP-1 message. If the router is configured to send only RIP-2 messages, such a query request must be ignored.
• Version field ? The Version field in the RIP packet determines how to handle RIP-1 and RIP-2 packets:
- If version = 0 in the RIP packet, the packet is discarded, regardless of what version the receiving router is running.
- If version = 1 in the RIP packet, all the "must be zero fields" are checked (refer to Figure 2-9). If the version is nonzero, the packet is discarded, regardless of what version the receiving router is running.
- If version = 2 in the RIP packet and the receiving router is running RIP-1, the receiving router should look at only the related information in the packet. All the "must be zero fields" are ignored.
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