ip route and traceroute

lmanavalan · ‎04-14-2010

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

Reza Sharifi · ‎04-14-2010

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 · ‎04-14-2010

Hi

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

Regards

Logesh

lamav · ‎04-14-2010

Logesh:

Youre right, there is no loop.

Victor

Tharak Abraham · ‎04-14-2010

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 · ‎04-15-2010

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