vPort History Example


The following is an example of utilizing the vport-history command to aid in troubleshooting connectivity issues.


In this example, host 1 and host 2 lost connectivity between 14:32 and 19:25 (approximate times).


seliinnru00801 >> 

- port 2 >> host1@??? >> mac 3c:fd:fe:e4:16:d0 ip 192.168.29.1 vlan 3311

- port 8 >> host2@eth3 >> mac 3c:fd:fe:e4:2c:74 ip 192.168.29.38 vlan 3311


Sample One


vport-history during impact period


CLI (network-admin@seliinnru00802) > vport-history-show mac 3c:fd:fe:e4:2c:74 ip 192.168.29.38 vlan 3311 start-time 2020-09-28T12:13 end-time 2020-09-28T17:30 limit-output 1111

CLI (network-admin@seliinnru00802) > vport-history-show mac 3c:fd:fe:e4:16:d0 ip 192.168.29.1 vlan 3311 start-time 2020-09-28T12:13 end-time 2020-09-28T17:30 limit-output 1111


Sample Two


vport history between a non impacted time 


CLI (network-admin@seliinnru00802) > vport-history-show mac 3c:fd:fe:e4:2c:74 ip 192.168.29.38 vlan 3311 start-time 2020-09-27T12:13 end-time 2020-09-27T17:30 limit-output 1111

CLI (network-admin@seliinnru00802) > vport-history-show mac 3c:fd:fe:e4:16:d0 ip 192.168.29.1 vlan 3311 start-time 2020-09-27T12:13 end-time 2020-09-27T17:30 limit-output 1111


Comparing sample one with sample 2 provides an insight on changes. If none this is not an Arista issue the customer has to review non-Arista aspects. 


To further strengthen our assessment. we noticed rx pkt drops at one of the computes,


root@compute-111-2:/etc/network/interfaces.d# ifconfig eth3

eth3 Link encap:Ethernet HWaddr 3c:fd:fe:e4:2c:74

 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

 RX packets:21105260769 errors:0 dropped:696542 overruns:0 frame:0 <---------------

 TX packets:15804864653 errors:0 dropped:0 overruns:0 carrier:0

 collisions:0 txqueuelen:1000

 RX bytes:19228611178036 (19.2 TB) TX bytes:21650238850968 (21.6 TB)


with no output errors on either of the ports.


==================== port-stats-show =========================

time     port ibytes iUpkts iBpkts iMpkts iCongDrops ierrs obytes oUpkts oBpkts oMpkts oCongDrops oerrs mtu-errs 

-------- ---- ------ ------ ------ ------ ---------- ----- ------ ------ ------ ------ ---------- ----- -------- 

11:15:49 2    335T   414G   871K   20.6M  0          0     682T   508G   581M   25.3M  0          0     0        

11:15:49 8    19.8T  14.7G  255K   773K   0          0     17.7T  18.7G  1.11G  6.48M  0          0     0        

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