Re: I see this error in our switch how I can fix it

mfaridi1978 · ‎04-09-2023

Our sysadmin say he see this error on Cisco switch

What is meaning of this error and how I can fix it?

which command run by sysadmin and make this output.

I want run it again.

We have ESXiand on this ESXi run more than 30 VM, and ESXi connected to our Switch

and this is my switch config

Building configuration...

Current configuration : 7112 bytes
!
version 12.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname xxx
!
boot-start-marker
boot-end-marker
!
enable secret xxx
!
username xxx privilege 15 secret xxx
no aaa new-model
system mtu routing 1500
ip subnet-zero
!
ip domain-name mfaridi
!
!
crypto pki trustpoint TP-self-signed-3810083840
 enrollment selfsigned
 subject-name cn=IOS-Self-Signed-Certificate-3810083840
 revocation-check none
 rsakeypair TP-self-signed-3810083840
!
!
crypto pki certificate chain TP-self-signed-3810083840
 certificate self-signed 01
  something is here
  quit    
!         
!         
!         
!         
!         
spanning-tree mode pvst
spanning-tree extend system-id
!         
vlan internal allocation policy ascending
!         
!         
!         
interface Port-channel1
 description SW-DC-EXSI-1
 switchport mode trunk
!         
interface GigabitEthernet0/1
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/2
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/3
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/4
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/5
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/6
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/7
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/8
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/9
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/10
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/11
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/12
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/13
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/14
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/15
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/16
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/17
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/18
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/19
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/20
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/21
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/22
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/23
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/24
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/25
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/26
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/27
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/28
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/29
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/30
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/31
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/32
 switchport access vlan 101
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/33
 description ESXI-1-port1
 switchport mode trunk
!         
interface GigabitEthernet0/34
 description ESXI-1-port2
 switchport mode trunk
!         
interface GigabitEthernet0/35
 description ESXI-1-port3
 switchport mode trunk
!         
interface GigabitEthernet0/36
 description ESXI-1-port4
 switchport mode trunk
!         
interface GigabitEthernet0/37
 description ILO EXSI-1 90.202
 switchport access vlan 100
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/38
 description MIK-CORE-1-port3
 switchport mode trunk
!         
interface GigabitEthernet0/39
!         
interface GigabitEthernet0/40
 description mangment_Admin
 switchport access vlan 100
 switchport mode access
 spanning-tree portfast
!         
interface GigabitEthernet0/41
 switchport mode trunk
!         
interface GigabitEthernet0/42
 switchport mode trunk
!         
interface GigabitEthernet0/43
 switchport mode trunk
!         
interface GigabitEthernet0/44
 switchport mode trunk
!         
interface GigabitEthernet0/45
!         
interface GigabitEthernet0/46
!         
interface GigabitEthernet0/47
!         
interface GigabitEthernet0/48
!         
interface Vlan1
 no ip address
 no ip route-cache
!         
interface Vlan100
 ip address 192.168.90.10 255.255.255.0
 no ip route-cache
!         
ip default-gateway 192.168.90.11
ip http server
ip http secure-server
!         
control-plane
!         
!         
line con 0
 login local
line vty 0 4
 privilege level 15
 login local
 transport input telnet ssh
line vty 5 15
 no login 
!         
end

In our network we have more than 30 VMs run on ESXi, from last week some of this server is not accessible and I do not have ping of them and can not SSH to them.

We have 2 two subnet in our network

192.168.90.0/24 use for our Linux and Windows servers, these clients get static IP, default gateway is 192.168.90.11

192.168.91.0/24 use for our clients all of them are windows, these clients get IP by DHCP server, our Mikrotik server is DHCP server and default gateway is 192.168.91.11

From last week some of 192.168.90.0/24 can not ping their default gateway,

I do know can this problem happen by these errors our no.

balaji.bandi · ‎04-11-2023

which command is run by the sysadmin and makes this output. <<- show logging (command you need to view the logs)

MAC Flap happening because you configured it as a Trunk port so the MAC address or using a different port example your cases 33 and 36

interface GigabitEthernet0/33
 description ESXI-1-port1
 switchport mode trunk
!         
interface GigabitEthernet0/34
 description ESXI-1-port2
 switchport mode trunk
!         
interface GigabitEthernet0/35
 description ESXI-1-port3
 switchport mode trunk
!         
interface GigabitEthernet0/36
 description ESXI-1-port4
 switchport mode trunk

To avoid this issue, configure LACP trunk between Switch and esxi switch or portgroup.

check the VMAWARE document :

https://kb.vmware.com/s/article/1004048

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