Hello community,
Recently, I observed very strange situation. Users were complaining about general slowness of internet connection. I performed ping and traceroute from Core switch to 8.8.8.8 and ping latency was very good whereas traceroute showed high latency inside ISP's network. We opened ticket for ISP and after some time issue was resolved. But my question is, how is possible that latency of ping was fine? How is it possible that there is difference between in latency between ping and traceroute? Below is example of output with modified IP addresses:
CoreSwitch#ping 8.8.8.8
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 5/5/7 ms
CoreSwitch#traceroute 8.8.8.8 numeric
Type escape sequence to abort.
Tracing the route to 8.8.8.8
VRF info: (vrf in name/id, vrf out name/id)
1 192.21.17.225 0 msec 0 msec 0 msec
2 7.19.29.217 1 msec 1 msec 1 msec
3 3.72.12.251 1 msec 1 msec 1 msec
4 * * *
5 12.14.11.18 2993 msec
12.14.11.20 2411 msec
12.14.11.18 2680 msec
6 *
17.29.3.75 2986 msec
18.72.6.162 2560 msec
7 *
17.29.3.1 332 msec
17.29.3.4 980 msec
8 17.29.4.21 1483 msec * *
9 8.8.8.8 1633 msec 1794 msec *
CoreSwitch#