Last year our RSM /Cat5509 failed and a decision was made to replace it with a layer 3 switch ie: Cat4948 rather than try to source another RSM/Cat5509.
Our telemetry server logs have highlighted that although NTP was being distributed out from our clock unit plugged into the cat5509/RSM before the change out. Once the Cat4948 was installed NTP stopped being distributed to the rest of the network. The NTP configuration was copied directly from the RSM to the new 4948.
The clock/sync unit is plugged directly into one of the ports on the Cat4948 and NTP is being picked up by the Cat4948 (see below). However, the 3660 that is directly connected into the Cat4948 (Ethernet port to Ethernet port) does not seem to be picking NTP up from the Cat4948.
It appears that whilst the Cat4948 is able to pick up NTP from the sync unit, the Cat 4948 is not re-distributing NTP
The information that you posted shows clearly that the 4948 is learning NTP time from the server at 18.104.22.168. And it shows that the 3660 is attempting to learn NTP from the same server but is not. There are several things that might cause this:
- is there an IP connectivity issue? Can the 3660 ping the NTP server? Did something perhaps change in the routing logic on the 4948?
- is there something that is filtering traffic (firewall or interface access list) that might be filtering the NTP attempt from the 3660 or filtering responses back from the server?
One alternative to consider might be to change the config of the 3660 and have it learn NTP from the 4948 rather than from the same server that the 4948 is learning from.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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