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cisco traceroute

Posted on 2008-11-18
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when I traceroute from one of our remote sites, I get this output:
 1 172.31.1.2 48 msec
    172.31.1.1 20 msec
    172.31.1.2 48 msec
  2 10.0.0.11 24 msec
    10.50.4.2 28 msec
    10.0.0.11 20 msec
  3 10.21.1.11 28 msec 24 msec 28 msec

could someone tell me why there are three lP's under two of the hops?  this remote site is a site-to-site vpn.  Thanks.
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Question by:jiggin23
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Don Johnston earned 500 total points
ID: 22988303
By default, Cisco traceroute sends three separate packets with the same TTL. In your case, you are seeing that there are two paths to the destination.

One path goes through 172.31.1.1 and the other goes through 172.31.1.2. Then each of the two paths have different next hops afterward.

Your network may look something like this:

               /-------172.31.1.1---------10.0.0.11------\
Source <                                                      > 10.21.1.11
               \-------172.31.1.2---------10.50.4.2------/
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Author Comment

by:jiggin23
ID: 22988567
okay, so is it possible to tell wich one is preferred, by a traceroute?
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by:Don Johnston
ID: 22988614
There is no "preferred". If there are two routes with equal cost, Cisco will alternate the packets over BOTH paths.
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