Re: error: the ethernet-switching subsystem is not responding to management requests

I don’t find any traces/clue for an hardware issue. It could be a issue introduced due to a loop or a genuine software issue.

Is there any eswd cores? "show system core-dumps"

switch> show ethernet-switching table

error: the ethernet-switching subsystem is not responding to management requests

switch> show system processes extensive | grep eswd

  PID USERNAME   THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND

17856 root         1 131    0 12400K 13172K RUN    636:39 87.99% eswd

Next Action:

Try restarting the Restart eswd process and try if it recovers the issue.

I could come across an interesting PR as below, however it is supposed to have the fix in 12.3 [in your release]. Please open a jtac case to get it confirmed and for any software assistance.

http://www.juniper.net/techpubs/en_US/junos12.3/information-products/topic-collections/release-notes/12.3/topic-69602.html

Also, On EX Series switches with private VLAN (PVLAN) and DHCP snooping configured, if the interface configured with PVLAN flaps, the Ethernet switching process (eswd) might stop responding to management requests, and high eswd and Software Forwarding Infrastructure process (sfid) utilization might be observed. [PR/1022312: This issue has been resolved.]