The IOS waits for the RTO time period, before which it retransmits a packet from the retransmission queue for the neighbor.
EIGRP sends hellos as multicast packets to neighbors, on 220.127.116.11.
When reply to the multicast fails, from the neighbor (say neighbor is dead), it starts unicasting the hello packet that particular neighbor. RTO is the time that the software waits for receipt of the acknowledgement for the Unicast hello sent. That means RTO is the time interval between each unicast hello message sent. I think EIGRP software tries this for 10 successive times.
I think the default value of RTO is 200 ms...... and it is increased by the EIGRP software, each time it sends a unicast (and neighbor fails to respond each time). If you wanna test this, first create neighbor relationship between 2 routers using EIGRp, clear the neihbor using clear ip eigrp nei command, and check on the other router, the increase in RTO.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...