ip route and traceroute

Unanswered Question
Apr 14th, 2010
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Hi,


i executed "traceroute 10.71.252.18" and the result is


internalrouter#traceroute 10.71.252.18


Type escape sequence to abort.
Tracing the route to 10.71.252.18


  1 10.71.0.34 132 msec
    10.71.0.30 136 msec
    10.71.0.34 132 msec
  2 10.64.128.42 136 msec
    10.64.144.42 132 msec
    10.64.128.42 140 msec



Does this means that it has 2 routes to the destination


And also i executed "sh ip route 10.71.252.18" the result is


internalrouter#sh ip route 10.71.252.18
Routing entry for 10.71.252.16/30
  Known via "ospf 1", distance 110, metric 30, type intra area
  Last update from 10.71.0.34 on Tunnel10, 00:19:06 ago
  Routing Descriptor Blocks:
  * 10.71.0.34, from 10.64.147.1, 00:19:06 ago, via Tunnel10
      Route metric is 30, traffic share count is 1
    10.71.0.30, from 10.64.147.1, 00:19:06 ago, via Tunnel9
      Route metric is 30, traffic share count is 1



what is the symbol * represents. Does it means there are two routes available and the route with the * is the prefered one


Regards

Logesh

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Reza Sharifi Wed, 04/14/2010 - 19:46
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Hi Logesh,


Does this means that it has 2 routes to the destination

No, 1,2 in the trace route are sequence numbers.  Check your tunnel config as it looks like you have a loop in your network, because 10.71.0.34 132 and 10.64.128.42 appear twice in your trace route.



what is the symbol * represents. Does it means there are two routes available and the route with the * is the prefered one


Yes, * means that is the active route


HTH

Reza

lmanavalan Wed, 04/14/2010 - 20:51
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Hi


i believe thats not the Loop in the Network thats the Redundant Path to the destination


Regards

Logesh

lamav Wed, 04/14/2010 - 21:14
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Logesh:


Youre right, there is no loop.


Victor

Tharak Abraham Wed, 04/14/2010 - 21:59
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Redundant paths !

Could you please post a "sh ip route" of the routing table too ?


please try with a traceroute xxxx source yyyy and see if there is any change in the observation !

(yyyy being the interface where you intend to source the udp probes)

mlund Thu, 04/15/2010 - 06:52
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Hi Logesh


The result clearly indicate that there is two paths to the destination.

Traceroute toggles each probe between the different equal cost paths that is avalable.


*—Indicates the last path used when a packet was forwarded. It pertains only to the nonfast-switched packets. However, it does not indicate which path will be used next when forwarding a nonfast-switched packet, except when the paths are equal cost.


/Mikael

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