Switching

Below is the output of show log messages on one of my switch stacks. As you can see I have ports flapping quite often.

Does this just mean the device (computer) that is attached to this port is being turned off or on? If not, then how do I troubleshoot flapping ports?

I thought it might be a spanning tree issue but spanning tree has not change in a long time as shown by "show spanning-tree bridge"

Mar 9 09:59:09 JH142A mib2d[1333]: SNMP_TRAP_LINK_DOWN: ifIndex 587, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-0/0/46
Mar 9 09:59:29 JH142A mib2d[1333]: SNMP_TRAP_LINK_DOWN: ifIndex 587, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-0/0/46
Mar 9 10:01:25 JH142A mib2d[1333]: SNMP_TRAP_LINK_DOWN: ifIndex 672, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-2/0/19
Mar 9 10:02:18 JH142A mib2d[1333]: SNMP_TRAP_LINK_DOWN: ifIndex 672, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-2/0/19
Mar 9 10:06:34 JH142A mib2d[1333]: SNMP_TRAP_LINK_DOWN: ifIndex 671, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-2/0/18
Mar 9 10:07:25 JH142A mib2d[1333]: SNMP_TRAP_LINK_DOWN: ifIndex 671, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-2/0/18
Mar 9 10:08:25 JH142A mib2d[1333]: SNMP_TRAP_LINK_DOWN: ifIndex 594, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-0/0/44
Mar 9 10:08:31 JH142A mib2d[1333]: SNMP_TRAP_LINK_DOWN: ifIndex 594, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-0/0/44
Mar 9 10:09:19 JH142A mib2d[1333]: SNMP_TRAP_LINK_DOWN: ifIndex 594, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-0/0/44
Mar 9 10:12:24 JH142A mib2d[1333]: SNMP_TRAP_LINK_DOWN: ifIndex 556, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-0/0/26
Mar 9 10:12:28 JH142A mib2d[1333]: SNMP_TRAP_LINK_DOWN: ifIndex 556, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-0/0/26
Mar 9 10:18:10 JH142A mib2d[1333]: SNMP_TRAP_LINK_DOWN: ifIndex 504, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-0/0/0
Mar 9 10:18:14 JH142A mib2d[1333]: SNMP_TRAP_LINK_DOWN: ifIndex 504, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-0/0/0

Yes, access ports for workstations will flap as computers turn on and off.  In most environments that I worked in we exclude sending this trap from user access ports for that reason and only monitor this on interconnects.

We did some testing in my office, turning desktop PCs on and off and sure enough we see the same thing.

How do I exclude sending this trap from user access ports?

Figured this out myself, here is the article

http://www.juniper.net/documentation/en_US/junos15.1/topics/task/configuration/interfaces-enabling-or-disabling-snmp-notifications-on-physical-interfaces.html

The question becomes, is it worth it to disable traps on all 48 edge ports on an EX switch or just live with a lot of SNMP_TRAP_LINK_DOWN message in the message log. The SNMP_TRAP_LINK_DOWN is generated everytime a destkop PC is powered off or on

You can create a group that applies the no-trap to every interface.

set groups MYGROUP interfaces <*-*> no-traps

set apply-groups MYGROUP

Then override this with traps on the desired interfaces only

set interfaces ge-0/0/0 apply-groups-except MYGROUP

set interfaces ge-0/0/0 traps

documentation

https://www.juniper.net/documentation/en_US/junos15.1x49/topics/task/configuration/junos-software-configuration-groups-inheritance-disabling.html