Changing the TTL threshold
The time to live (TTL) threshold prevents routing loops by specifying the maximum number of router hops an IP packet originated by the Layer 3 switch can travel through. Each device capable of forwarding IP that receives the packet decrements (decreases) the packet TTL by one. If a device receives a packet with a TTL of 1 and reduces the TTL to zero, the device drops the packet.
The default value for the TTL threshold is 64. You can change the TTL threshold to a value from 1 through 255.
To modify the TTL threshold to 25, enter the ip ttl command.
device(config)# ip ttl 25
Syntax: ip ttl ttl-threshold