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Show Layer-3 Switches on Traceroute?

Posted on 2008-10-13
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Last Modified: 2012-08-14
I have a number of Cat 3550-L3 switches.  Can I make them reply to trace routes as a hop?
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Question by:RPPreacher
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5 Comments
 
LVL 43

Expert Comment

by:JFrederick29
ID: 22703028
Are they routing or just used as L2 switches?  If they are routing and hops in the network, they should reply to a traceroute automatically.
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LVL 20

Author Comment

by:RPPreacher
ID: 22703071
They are not routing.  We use the L3 function for wired 802.1X guest vlan assignment.  They are all in the same subnet but it would be nice if I could force them to reply.
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LVL 43

Accepted Solution

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JFrederick29 earned 500 total points
ID: 22703095
If trace routing to a host attached to one of the switches, they won't reply unless they are a hop in the network unfortunately.
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LVL 43

Expert Comment

by:JFrederick29
ID: 22703109
This is due to the nature of trace routing and TTL handling.  Only a router will decrement the TTL and since the switches aren't routing, they simply pass the trace route packet onto the next hop (the end device in this case).
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Author Closing Comment

by:RPPreacher
ID: 31406214
Figures.
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