when i issue an extended trace for destination i am getting output like
Tracing the route to 10.128.10.10
1 10.132.252.13 0 msec
10.132.253.30 4 msec
10.132.252.13 0 msec
2 10.132.253.33 4 msec
10.132.253.22 0 msec
10.132.253.33 4 msec
3 10.143.252.130 0 msec 4 msec 4 msec
4 10.143.252.66 8 msec 12 msec 8 msec
5 10.128.10.10 12 msec 12 msec 8 msec
is the traceroute mean there is loop in between 10.132.252.13 & 10.132.253.30
my understanding is there is no loop,since ospf cost to destination is same with my
2 links to destination router is trying to load balance
is it right?
ospf cost to destination is same for both the path
Trace sends 3 packets eachtime with TTL value starting from 0, & increments the TTL value till the time the pkt has actually reached the destination.
Its been observed that when there are multiple paths to the destination, then each trace pkt takes a separate alternate path to the destination.
In your case, seems like there are 2 alternate paths at each hop & thats why 1st pkt goes to primary 1st hop (10.132.252.13 ), 2nd pkt goes to redundant 1st hop (10.132.253.30) & 3rd pkt again goes to pri 1st hop(252.13-since there are no more alt paths). This repeats for 2nd hop as well.
hope that clarifies.
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