cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
237
Views
0
Helpful
2
Replies
Highlighted
Beginner

Possible mac-address blocking on 3750?

Hi everyone,

 

I have a VM connected on a single port of a switch and is configured with multiple servers under the same subnet x.x.25.0/24

 

#show mac address-table | i 1/0/15
 250    44a8.4217.e85d    DYNAMIC     Gi1/0/15
 250    72da.bb1f.a8d7    DYNAMIC     Gi1/0/15
 250    868c.6fe8.827d    DYNAMIC     Gi1/0/15
 250    de0e.9d6d.fb70    DYNAMIC     Gi1/0/15
 250    e61b.b65c.8d79    DYNAMIC     Gi1/0/15
#ping 10.65.25.208   ----> This is the server that I am having issue with
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.65.25.208, timeout is 2 seconds:
.....
#show arp | i 44a8.4217.e85d
Internet  10.65.25.206           28   44a8.4217.e85d  ARPA   Vlan250

#ping 10.65.25.206Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.65.25.206, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
#ping 10.65.25.207Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.65.25.207, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/9 ms

Strange thing is that one of the VM intermittently goes down and is unable to reach its gateway. But the rest is still okay and is able to ping vice versa.


Port configuration on the switch

interface GigabitEthernet1/0/15
 switchport access vlan 250
 switchport mode access

If this is being blocked by STP, the whole port should be down right? But its not, only a specific MAC cannot be ping and is unable to ping its gateway.

 

Does anyone have any advice? thank you

2 REPLIES 2
Highlighted
VIP Mentor

Hi

I don't see the arp output to see if your ip 10.65.25.208 is there. What is the mac address of that server?

It is attached to same esxi port-group like the others?

 

 


Thanks
Francesco
PS: Please don't forget to rate and select as validated answer if this answered your question
Highlighted

hello,

 

 it is

 250    de0e.9d6d.fb70    DYNAMIC     Gi1/0/15

 

Content for Community-Ad