This might be normal depending on how long the switch has been running.
The TTL failures counter is incremented every time a received packet TTL reaches 0.
The MTU failure counter is incremented every time a received packet size exceeds the outbound interface MTU but can't be fragmented due to the DF bit being set in the ip header.
There is not much you can do to prevent these counters from incrementing.
Hope this helps,
Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
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