static mac question

Does anybody know why when I try to assign this mac address to fa 0/2 it instead assigns to fa 0/1??? Below is the running config along with what I typed in attempt to assign the mac to fa 0/2

I am using a 2924XL enterprise switch with IOS c2900XL-h2s-mz-120_5_1-XP.bin

run config

Current configuration:
!
version 12.0
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Switch
!
!
!
!
!
!
!
ip subnet-zero
!
!
!
interface FastEthernet0/1
!
interface FastEthernet0/2
!
interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
!
interface VLAN1
ip address 192.168.1.2 255.255.255.0
no ip directed-broadcast
no ip route-cache
!
mac-address-table static 0000.00b0.0ce7 FastEthernet0/2 vlan 1
!
line con 0
logging synchronous
transport input none
stopbits 1
line vty 0 4
login
line vty 5 9
login
!
end

Default mac table

Switch#sh mac
Dynamic Address Count: 2
Secure Address Count: 0
Static Address (User-defined) Count: 0
System Self Address Count: 47
Total MAC addresses: 49
Maximum MAC addresses: 2048
Non-static Address Table:
Destination Address Address Type VLAN Destination Port

----

0000.00b0.0ce7 Dynamic 1 FastEthernet0/2
0001.42cc.c320 Dynamic 1 FastEthernet0/1

My attempt to configure a static route
Switch#config t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#mac static 0000.00b0.0ce7 fa0/2 vlan 1

Switch#sh mac
Non-static Address Table:
Destination Address Address Type VLAN Destination Port

----

0001.42cc.c320 Dynamic 1 FastEthernet0/1

Static Address Table:
Destination Address VLAN Input Port Output Ports

----

0000.00b0.0ce7 1 Fa0/1
1 Fa0/2
1 Fa0/3

Find more posts tagged with

Save $250 on 2025 certification boot camps from Infosec!

Book now with code EOY2025

Button

Comments

gojericho0

Does anyone have any ideas why i can not configure a static mac address to an interface? I checked on cisco's website to make sure my commands are right.

johnnynodough

OK, I have gone through a couple of variations of this scenario, and this is what I have found -

WHen I apply a "mac static 0000.0033.0000 fa0/3 vlan 1"- The same thing happens on my switches (both, same as yours), mac table shows Fa0/1

reload

When I apply a "mac static 0000.0033.0000 fa0/3 vlan 2" - The mac shows static on Vlan 2, FA0/3

reload

When I apply a "mac secure 0000.0033.0000 fa0/3 vlan 1 - The mac shows static on vlan 1, FA0/3

reload

When I configure port FA0/1 to be in VLAN003, and I apply the same "mac static 0000.0033.0000 fa0/3 vlan 1" The mac address shows fa0/2, which also happens to be the first port available in VLAN001.

Which leads me to a theory (probably wrong

), with a plain mac static command, when assigning ports to the default vlan, it will appear in the first port assignable in the vlan, since a plain ol mac static implies no swithport security (like mac sticky or secure), it only applies to the VLAN.