Run IGRP and RIP in parallel

IGRP and RIP can be run in parallel. Due to IRGP's jurisdiction distance, the IGRP information ignores the RIP information by default. However, when the network topology changes, IGRP and RIP cannot run in parallel.
Because the IGRP and RIP update timers are different, and the time required for the two to send route updates is also different, some of them use the IGRP route, while the other part of the network uses the RIP route, which leads to the loop. Even if these loops do not exist for a long time, TTL will quickly become 0. The Internet Control Packet Protocol (ICMP) sends the TTL exceeded message, this information causes most applications to terminate network connections.

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• Allows update of RIP unicast messages.

• RIP route table