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New Member

cisco3550 and mac address

i have following config on a 3550

!

interface FastEthernet0/1

description ***Bickerdike Court***

mac-address 0000.0000.0001

no switchport

ip address 10.10.4.1 255.255.255.0 secondary

ip address 195.134.26.62 255.255.255.240

duplex full

speed 100

no cdp enable

!

interface FastEthernet0/2

description ***Platt Court***

mac-address 0000.0000.0002

no switchport

ip address 10.10.6.1 255.255.255.0 secondary

ip address 195.134.26.94 255.255.255.240

duplex full

speed 100

no cdp enable

!

when i checked each interface it shows same BIA Mac address for all ports . Is this correct ? I can see MAc address table which has got number of addresses which I think should be used. for inetrafces

SH interfaces fast0/1

astEthernet0/1 is up, line protocol is up

Hardware is Fast Ethernet, address is 0000.0000.0001 (bia 000a.8a60.c480)

show interfaces fastEthernet 0/2

FastEthernet0/2 is up, line protocol is up

Hardware is Fast Ethernet, address is 0000.0000.0002 (bia 000a.8a60.c480)

1 ACCEPTED SOLUTION

Accepted Solutions
New Member

Re: cisco3550 and mac address

Normally it should not cause any problems, if you are using same mac-addresse on the router, beacuse the mac-address must only be "the only one" in a (sub)net. If you now configure different (sub)nets on the switch/router, then it is no problem, to use the same mac on the different (sub(nets). It is quite normal...

3 REPLIES
New Member

Re: cisco3550 and mac address

what is the IOS version that you are running on the switch? I have noticed a couple of problems including duplicate MAC addresses with the 12.1(8) code. You could check the Bug Toolkit for known bugs regarding this issue.

New Member

Re: cisco3550 and mac address

Normally it should not cause any problems, if you are using same mac-addresse on the router, beacuse the mac-address must only be "the only one" in a (sub)net. If you now configure different (sub)nets on the switch/router, then it is no problem, to use the same mac on the different (sub(nets). It is quite normal...

New Member

Re: cisco3550 and mac address

I have changed the Layer three interfaces into L2 switch ports and configured vlan interfaces for each vlan. This has resolved the issue. The problem was created as the connected l2 device was not having any vlan information and causing a loop.

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