I require a help to understand this.
We have Cisco 3845 with IOS c3845-spservicesk9-mz.124-17.bin.
We have at this end ATM interface and the other frame relay link.
While comisioning we got the folllowing error message
Jul 3 13:49:34.265: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 200: Neighbor xxx.xx.xx.xxx (ATM4/0.52) is down: retry limit exceeded
Jul 3 13:49:36.717: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 200: Neighbor XX.XX.XX.XX (ATM4/0.52) is up: new adjacency
Cisco recomended to use MTU size of 1500 and it resolved the problem.
Can somebody help me to understand what really made the eigrp to establish again with MTU size