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Changing the ttl threshold – Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide User Manual

Page 107

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To ABORT Trace Route, Please use stop-traceroute command.

Traced route to target IP node 10.157.22.80:

IP Address Round Trip Time1 Round Trip Time2

10.95.6.30 93 msec 121 msec

NOTE
In the previous example, 10.157.22.199 is the IP address of the domain name server (default DNS
gateway address), and 10.157.22.80 represents the IP address of the NYC02 host.

FIGURE 10 Querying a Host on the newyork.com Domain

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 2 switch can travel through. Each device capable of
forwarding IP that receives the packet decrements (decreases) the packet TTL by one. If a router
receives a packet with a TTL of 1 and reduces the TTL to zero, the router drops the packet.

The default TTL is 64. You can change the ttl-threshold to a value from 1 through 255.

Changing the TTL threshold

FastIron Ethernet Switch Layer 3 Routing Configuration Guide

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