3850 with IOS 16.3.6 Devices lose ability to ping vlan gateway

[azhar_eaggle1]

Some Devices lose ability to ping vlan gateway, but you can manage switch normally.

                      Cannot ping Some devices from the switch or Distribution layer, but switch can ping the gateway.

Actions:  reset L3 vlan on Distribution = no change

                                Bounced the Port channel/uplinks  on the distribution = no change

                                Tested traceroutes from the access switch = no problems noted.

                                Attempted pings from devices connected to switches =  not successful at all.

[Mark Malone]

sounds like switch is under pressure and dropping ICMP traffic on the control plane as its not prioritized its the first thing to go , does it ping through the switch end to end pc - pc , rather than pinging virtual gateway on the switch ? whats the CPU history like ?

[azhar_eaggle1]

      111111111111111111111111111111111111111111111111111111111111
      555111115555544444444442222244444222225555511111222221111155
  100
   90
   80
   70
   60
   50
   40
   30
   20 ***     *****                         *****
   10 **********************************************************
     0....5....1....1....2....2....3....3....4....4....5....5....6
               0    5    0    5    0    5    0    5    0    5    0
               CPU% per second (last 60 seconds)

      112141111111111111111111212124212321111111111111111113211111
      562805445976665445455455271507082218554565667554455755278565
  100
   90
   80
   70
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   50                              *
   40     *                        *                       *
   30     *                        *   *                   *
   20 ****#*  *******  * ** ******##***#**** ********  ****#****
   10 ##########################################################
     0....5....1....1....2....2....3....3....4....4....5....5....6
               0    5    0    5    0    5    0    5    0    5    0
               CPU% per minute (last 60 minutes)
              * = maximum CPU%   # = average CPU%

      3443536584735645523356659
      5628365325792262778750016
  100                         *
   90                         *
   80         * *             *
   70       * * *             *
   60       * * *  *  *   *** *
   50  *  * ***** *****   *****
   40 ***************** *******
   30 ************************#
   20 ************************#
   10 #########################
     0....5....1....1....2....2....3....3....4....4....5....5....6....6....7..
               0    5    0    5    0    5    0    5    0    5    0    5    0
                   CPU% per hour (last 72 hours)
                  * = maximum CPU%   # = average CPU%

[Mark Malone]

looks ok , is it pinging through the switch ok ? pc - pc

the reason im asking is pinging virtual gateway will never jive solid results and its advised to ping through end to end to get an accurate reading if the switch is actually dropping any traffic

anything in logs showing CPU or FED issue or HOG issues ?

16.6.6 or .5 are two stable denali releases for that platform , running 16.6.5 last few months no issues

[azhar_eaggle1]

IOS Code is 16.3.6 ...

do not see any things for CPU/FED/HOG in logs

but do see FED in Crashfiles all 

#show logging | i CPU
#show logging | i cpu
#show logging | i FED
#show logging | i HOG