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Hi guys,

do you know if I can change the MAC address associated to a VLAN interface.

In my 877 I created 3 VLAN further the default one.
I associated each VLAN to a specific FastEthernet interface.
I created 2 VRF groups and put 2 VLAN interfaces in first one and the others 2 in the second VRF group.

Than I decided that one interface of each VRF groups had to be connected to same LAN segment.
I got no problems on assigning 2 IP belonging to the same network because of th VRF settings.
But the problem is that one of the 2 doesn't work because it shares the same MAC address of the
other one.

Below the config and the VLAN database so you can have a clearer idea of what I set up

!
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname 2-VRFs
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
!
resource policy
!
ip cef
!
!
!
!
ip vrf SERVERS
rd 1:2
!
ip vrf WIRELESS
rd 1:1
!
interface ATM0
no ip address
shutdown
no atm ilmi-keepalive
dsl operating-mode auto
!
interface FastEthernet0
!
interface FastEthernet1
switchport access vlan 2
!
interface FastEthernet2
switchport access vlan 21
mac-address 0017.94a0.6046
!
interface FastEthernet3
switchport access vlan 22
!
interface Vlan1
ip address 192.168.200.153 255.255.255.0
!
interface Vlan21
ip vrf forwarding SERVERS
ip address 192.168.200.152 255.255.255.0
!
interface Vlan22
ip vrf forwarding SERVERS
ip address 192.168.69.254 255.255.255.128
!
interface Vlan2
ip address 10.0.0.2 255.255.255.248
!
!
!
no ip http server
no ip http secure-server
!
!
!
!
!
control-plane
!
!
line con 0
no modem enable
line aux 0
line vty 0 4
!
scheduler max-task-time 5000
end

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

2-VRFs#sh vlan-switch

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0
2 TO-WIRELESS1 active Fa1
21 NATIVE-2 active Fa2
22 TO-SERVERS1 active Fa3
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 1002 1003
2 enet 100002 1500 - - - - - 0 0
21 enet 100021 1500 - - - - - 0 0
22 enet 100022 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 1 1003
1003 tr 101003 1500 1005 0 - - srb 1 1002
1004 fdnet 101004 1500 - - 1 ibm - 0 0
1005 trnet 101005 1500 - - 1 ibm - 0 0

I saw that I can change the MAC-address of the FastEthernet interfaces but I think that is for STP
purposes.
My project is to have 2 "2-Ethernet interfaces" routers visible on the same LAN segment.
Obviously that environment is just for testing purposes.

Any ideas?


Alex.