Chapter 17
| General IP Routing
Configuring IP Routing Interfaces
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◆ A trace terminates when the destination responds, when the maximum
timeout (TTL) is exceeded, or the maximum number of hops is exceeded.
◆ The trace route function first sends probe datagrams with the TTL value set at
one. This causes the first router to discard the datagram and return an error
message. The trace function then sends several probe messages at each
subsequent TTL level and displays the round-trip time for each message. Not all
devices respond correctly to probes by returning an “ICMP port unreachable”
message. If the timer goes off before a response is returned, the trace function
prints a series of asterisks and the “Request Timed Out” message. A long
sequence of these messages, terminating only when the maximum timeout
has been reached, may indicate this problem with the target device.
◆ The same link-local address may be used by different interfaces/nodes in
different zones (RFC 4007). Therefore, when specifying a link-local address,
include zone-id information indicating the VLAN identifier after the % delimiter.
For example, FE80::7272%1 identifies VLAN 1 as the interface from which the
trace route is sent.
Web Interface
To trace the route to another device on the network:
1. Click IP, General, Trace Route.
2. Specify the target device.
3. Click Apply.
Figure 442: Tracing the Route to a Network Device
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