05-11-2010 07:23 PM - edited 03-06-2019 11:02 AM
Hi,
I have a very unique traceroute results which does not make too much sense to me.
Here are the traceroute results :-
1) On the switch that connects the site to the MPLS cloude :-
Traceroute #1 From switch S
Switch> (enable) traceroute 10.49.50.181
traceroute to 10.49.50.181 (10.49.50.181), 30 hops max, 40 byte packets
traceroute to 10.49.50.181 (10.49.50.181), 30 hops max, 40 byte packets
1 10.49.71.1 (10.49.71.1) 8 ms 9 ms 6 ms
2 10.49.140.81 (10.49.140.81) 9 ms 30 ms 11 ms
3 10.49.140.58 (10.49.140.58) 9 ms 7 ms 7 ms
4 10.49.53.1 (10.49.53.1) 15 ms 8 ms 10 ms
5 10.49.50.181 (10.49.50.181) 7 ms 8 ms 15 ms
2) Traceroute #2 : A PC on Site A's Network
tracert 10.49.50.181
Tracing route to [10.49.50.181]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms 10.49.71.1
2 5 ms 2 ms <1 ms 10.49.140.81
3 2 ms 2 ms 2 ms 10.49.140.58
4 2 ms 2 ms 2 ms 10.49.53.1
5 2 ms 2 ms 2 ms 10.49.50.181
The setup is :
*** DC --> MPLS Cloud --> Switch S --> PC ***
What I don't understand is the RTT on the PC is only 2ms to reach the DC but on the switch, a 4006 switch, the RTT time is much higher. The pc
is on a port on the 4006 switch.
Can anyone explain this to me ?
Cheers,
-sn-
05-11-2010 11:08 PM
Hi,
I have a very unique traceroute results which does not make too much sense to me.
Here are the traceroute results :-
1) On the switch that connects the site to the MPLS cloude :-
Traceroute #1 From switch S
Switch> (enable) traceroute 10.49.50.181
traceroute to 10.49.50.181 (10.49.50.181), 30 hops max, 40 byte packets
traceroute to 10.49.50.181 (10.49.50.181), 30 hops max, 40 byte packets
1 10.49.71.1 (10.49.71.1) 8 ms 9 ms 6 ms
2 10.49.140.81 (10.49.140.81) 9 ms 30 ms 11 ms
3 10.49.140.58 (10.49.140.58) 9 ms 7 ms 7 ms
4 10.49.53.1 (10.49.53.1) 15 ms 8 ms 10 ms
5 10.49.50.181 (10.49.50.181) 7 ms 8 ms 15 ms
2) Traceroute #2 : A PC on Site A's Network
tracert 10.49.50.181
Tracing route to [10.49.50.181]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms 10.49.71.1
2 5 ms 2 ms <1 ms 10.49.140.81
3 2 ms 2 ms 2 ms 10.49.140.58
4 2 ms 2 ms 2 ms 10.49.53.1
5 2 ms 2 ms 2 ms 10.49.50.181
The setup is :
*** DC --> MPLS Cloud --> Switch S --> PC ***
What I don't understand is the RTT on the PC is only 2ms to reach the DC but on the switch, a 4006 switch, the RTT time is much higher. The pc
is on a port on the 4006 switch.
Can anyone explain this to me ?
Cheers,
Hi,
Genrally the RTT defination says in trace route packet is each millisecond (ms) time in the table is the round-trip time that it took (to send the ICMP packet and to get the ICMP reply packet). The faster (smaller) the times the better. ms times of 0 mean that the reply was faster than the computers timer of 10 milliseconds, so the time is actually somewhere between 0 and 10 milliseconds.
RTT's reported are the round trip times from the source host to that router hop. It's not a cumulative sum of the previous times. Each hop is going to add some time to the path, so you'd expect each hop to take a little bit more time to get to than the last.
Hope that Help !!
Ganesh.H
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