![]() R2#debug eigrp packets update ack query reply R3#debug eigrp packets update ack query reply R3 continues to wait on a reply from R2, but R2 can’t reply until it receives an ACK and a reply from R1: R2 does not receive an ACK to the query that it sent to R1 so it continues to retransmit it. R3 acknowledges the query and sends a reply with it’s current metric (infinity). R2 acknowledges the query and sends queries to both R1 and R3 for the route. When R3’s loopback gets shutdown, R3 sends a query to R2 for 10.3.3.0/24. ![]() We will shut down R1 S0/0 so that R1 stops receiving traffic from R2, and then shut down R3’s loopback: Keepalives have been disabled on the R1-R2 link and the hold timer increased on R1 to prevent R2 from discovering that R1 is down before the active timer expires. The active timer has been lowered to 1 minute on R2 and R3 in order to see the results faster. This first example uses IOS version 12.0(5), which does not have support for SIA-query and SIA-reply messages.
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