You can't really use the interfaces as a ping test as the router gives a very low priority to ping response . You need to ping thru these interfaces , get a device off the router and ping thru these interfaces to another device on the other side to get a more accurate view . I have seen on layer 2 switches if you ping 2 different switches interfaces on the same vlan I have seen it at least 20 ms so pinging from one interface to another is not a good test , use devices that are hung off each side as ping test points. I have seen this documented on CCO also .
I knew that ping has a low priority in traffic but I didn't think that these ping times could be this high.
I did ping other devices as well on the LAN and across the WAN and they came up fine (my normal ping times are around 30-40ms). My problem is still unresolved since there are periods when latency goes up the wall, with ping times aroun 4000 ms or sometimes even more.
any ideas on where I should be looking at? I'll keep digging.
At the time you are experiencing the high latency take a look at your serial interface on both sides . It sounds like your serial interface is either tx or rx a high load , do a sh int serial x and look at the load ,
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