Hi,
Im having some, to me, strange behavior with a EX4550-32F series Virtualchassis. We have it running on the 12.3R6.6 Junos and in a VC setup (2 switches). On this, we have give or take 27 LACP trunks in Mode Active. Also, there are a bunch of vlans configured reaching numbers of 3000's.
However, when were looking closer to a high cpu usage issue (not part of this post) we ran into something of the mac-aging table. It seems to have numerous update within a short period. If we took samples, fiddled with it (sorting/uniq etc) a top 5 of mac-addresses shows more than 150+ learn&deletes in a period of 2 mins and 30sec.
Let me point out, there are no flaps or port errors on all the lacp trunks.
Top 5 (lear&delete combined)
168x 00:50:56:01:01:53
165x 00:50:56:8d:31:47
159x 00:50:56:82:55:16
148x 00:50:56:01:01:69
138x 00:50:56:9b:37:db
The mac-learning log show things like this, a lot:
Thu Mar 31 10:32:09 2016 vlan_name vlan2444 mac 00:50:56:9b:37:db was deleted on ae26.0
Thu Mar 31 10:32:09 2016 vlan_name vlan2444 mac 00:50:56:9b:37:db was learned on ae26.0
Thu Mar 31 10:32:12 2016 vlan_name vlan2444 mac 00:50:56:9b:37:db was deleted on ae26.0
Thu Mar 31 10:32:12 2016 vlan_name vlan2444 mac 00:50:56:9b:37:db was learned on ae26.0
Thu Mar 31 10:32:14 2016 vlan_name vlan2444 mac 00:50:56:9b:37:db was deleted on ae26.0
Thu Mar 31 10:32:14 2016 vlan_name vlan2444 mac 00:50:56:9b:37:db was learned on ae26.0
Thu Mar 31 10:32:17 2016 vlan_name vlan2444 mac 00:50:56:9b:37:db was deleted on ae26.0
Thu Mar 31 10:32:17 2016 vlan_name vlan2444 mac 00:50:56:9b:37:db was learned on ae26.0
It happens on all interfaces, some more then others, and it is not all vmware related mac addresses.
When looking into the statistics it even show numbers in the negative. How come?
switch> show ethernet-switching statistics aging
Total age messages received: 1967840190
Immediate aging: 105888133, MAC address seen: -48708009, MAC address not seen: 1910660066
I have found that the default aging timer is 300sec , but this is not explicitly set in the configuration.
Can anyone shed some light on this? Is this normal? Is the mac-aging configuration different from the default when not set?