cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
708
Views
0
Helpful
2
Replies

Duplicate address error on L3 Module

avilt
Level 3
Level 3

HI,

I am getting the following log message on my L3 device and the L3 switch hangs. I have restricted telnet session on the L3 device. What is causing this ?

32w1d: %AUTOSTATE-6-SHUT_DOWN: Putting interface Port-channel10.131 into Autostate mode

32w1d: %SYS-5-CONFIG_I: Configured from console by vty0 (127.0.0.2)

32w1d: %AUTOSTATE-6-BRING_UP: Taking interface Port-channel10.131 out of Autostate mode

32w1d: %AUTOSTATE-6-SHUT_DOWN: Putting interface Port-channel10.131 into Autostate mode

32w1d: %AUTOSTATE-6-BRING_UP: Taking interface Port-channel10.131 out of Autostate mode

39w3d: %IP-4-DUPADDR: Duplicate address x.x.85.254 on Port-channel10.101, sourced by 0080.7733.b2f9

48w2d: %STANDBY-3-DUPADDR: Duplicate address x.x.83.251 on Port-channel10.102, sourced by 0000.0c07.ac66

I tried to track these two mac addresses 0080.7733.b2f9 and 0000.0c07.ac66

These mac addresses belong to IP phones which are connected to a L2 device which in turn cascaded to the L3 switch.

Whats the meaning of "Duplicate address x.x.85.254 on Port-channel10.101, sourced by 0080.7733.b2f9 "

x.x.85.254 is the L3 IP(Virtual L3 interface) on the L3 switch.

Is the IP phones MAC address conflicting with the mac address of the L3 switch?

How can I find the L3 switch's system mac addresses.

Appreciate some detailed explanation.

1 Accepted Solution

Accepted Solutions

aijaz802
Level 1
Level 1

Hi,

I'm not are you also looking for a solution for the autostate mode as shown in log.

Please note that the L3 switch L3 vlan will not be in up/up state until on these conditions met.

VLAN should exists and is in active status on the switch VLAN database.

VLAN interface exists on the router/switch and is not administratively down.

At least one L2 (access port or trunk) port exists and has a link up on this VLAN.

At least one L2 (access port or trunk) port is in spanning-tree forwarding state on the VLAN.

To know more about the autostate shutdown please go thru the link...

http://www.cisco.com/warp/public/473/188.html

Regarding the duplicate address, it seems that either the IP phone or the portchannel interface 10.101 might be configured with the the same IP address. Please check...If u r using DHCP check the exclude range..

To know the L3 switch system MAC address you can use the command =show switch or show interfaces.... here you will get the base MAC entry....and it will be incremented by 1 for each interface...ex:

0202.2020.0880 base... first port 0202.2020.0881

Pls. rate if it helps...

BR

*aijaz*

View solution in original post

2 Replies 2

aijaz802
Level 1
Level 1

Hi,

I'm not are you also looking for a solution for the autostate mode as shown in log.

Please note that the L3 switch L3 vlan will not be in up/up state until on these conditions met.

VLAN should exists and is in active status on the switch VLAN database.

VLAN interface exists on the router/switch and is not administratively down.

At least one L2 (access port or trunk) port exists and has a link up on this VLAN.

At least one L2 (access port or trunk) port is in spanning-tree forwarding state on the VLAN.

To know more about the autostate shutdown please go thru the link...

http://www.cisco.com/warp/public/473/188.html

Regarding the duplicate address, it seems that either the IP phone or the portchannel interface 10.101 might be configured with the the same IP address. Please check...If u r using DHCP check the exclude range..

To know the L3 switch system MAC address you can use the command =show switch or show interfaces.... here you will get the base MAC entry....and it will be incremented by 1 for each interface...ex:

0202.2020.0880 base... first port 0202.2020.0881

Pls. rate if it helps...

BR

*aijaz*

This was due to spanning tree loop which was created by accidentally connecting 2 data ports into the same switch.

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: