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BGP looking glass

Posted on 2012-12-24
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I did a traceroute on an IP public address through the Sprintlink looking glass (www.sprint.net/lg/) and at the end I saw my IP address listed 3 times (see below). What does it mean?

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8 so-0-0-0-2.pitbpamaw03cr01.paetec.net (64.80.253.237) [AS 1785] [MPLS: Label 16002 Exp 0] 72 msec 72 msec 84 msec
9 ge-9-0-0.PITBPAMAW03PE01.paetec.net (169.130.100.88) [AS 1785] 68 msec 68 msec 68 msec
10 uslec-71.16.37.202.cust.uslec.net (71.16.37.202) [AS 1785] 72 msec 68 msec 72 msec
11 my_public_ip_address [my_AS] 68 msec 68 msec 72 msec
12 my_public_ip_address [my_AS] 68 msec 68 msec 72 msec
13 my_public_ip_address [my_AS] 68 msec 68 msec 72 msec
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Question by:biggynet
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btan earned 2000 total points
ID: 38719720
suspecting loops -e.g. routing loop indicated such that one or more routers being repeated several times within the traceroute. This discussion may be of interest

https://supportforums.cisco.com/thread/2174484

Another but having the repeated interleaved which make is more probably looping issue and confirmed with ping seeing error message will show “TTL expired in transit”.

http://www.rracuares.com/2010/03/04/ping-and-traceroute-routing-loop-solved/
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by:biggynet
ID: 38722658
Thanks for the links. I will take a look at them. I am trying to understand if it is really a loop because the same ip address repeated itself 3 times through the traceroute.
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Expert Comment

by:btan
ID: 38722776
But eventually the result should be successful in completing the traceroute else there  would be some faults along the way
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