The article presents a known issue of traceroute in XOS 9.7.2 and howto resolve it.Customer starts traceroute
through X-series chassis, intermediate hops between X-series chassis and the target host are not displayed in command output until the destination hop replies back.
# tracert <SOME_IP>
Tracing route to <SOME_IP> over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms <HOP1_IP>
2 <1 ms <1 ms <1 ms <HOP2_IP>
3 1 ms 320 ms <1 ms <X-SERIES_HOP>
4 * * * Request timed out.
5 * * * Request timed out.
6 * * * Request timed out.
7 * * * Request timed out.
8 * * * Request timed out.
9 3 ms 6 ms * <SOME_IP>
The symptom is present on series-6 NPMs and XOS 9.7.2.
Please, also run traceroute from the 1st hop behind X-series to the target host to verify you're indeed affected by this bug and that the "TTL expired" messages are not accidentally blocked by some other device on the return path.