Hello All:
I think I may have a duplicate IP issue. My connection looks to be intermittently working, sometimes I can't access it, then sometimes I can but I will be disconnected after 1 minute or so.
Does anyone have any suggestions on how to approach this issue?
Thank you in advance,
Ashley
已解决! 转到解答。
Check Switch Logs if you have enable logging buffered you will get duplicate ip address logs in switches.
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This message is because you have an OSPF problem. You may have the same IP address configured on two of your loopback interfaces.
If you post up some scrubed configs we may be able to help you find the offender.
Take a look at the other router that is terminating your SVIs. I would wager its IP is 33.3 as well, but it should be 33.2.
Also this interface's IP would have been selected as the router ID because it was either hard coded as the router ID under the OSPF process, or because you do not have a loopback interface. You could try giving the devices a loopback address, as this is best practice for OSPF. After you configure the loopbacks you would need to clear the OSPF possess to get the device to pickup the new router ID.
Gregory:
It's just a small network with 2 servers, 2 switches and a router. The switches are layer 3. I did a show log on one of my switches and got this:
Apr 4 16:14:14.718: %OSPF-4-DUP_RTRID_AREA: Detected router with duplicate router ID 192.168.33.2 in area 1
This message is because you have an OSPF problem. You may have the same IP address configured on two of your loopback interfaces.
If you post up some scrubed configs we may be able to help you find the offender.
You can help find the offender? How? I know what the offender IP address is, but I can't find it.
Here is the latest config:
Apr 4 16:25:15.055: %OSPF-4-DUP_RTRID_AREA: Detected router with duplicate router ID 192.168.33.3 in area 1
Apr 4 16:26:20.159: %OSPF-4-DUP_RTRID_AREA: Detected router with duplicate router ID 192.168.33.3 in area 1
interface Vlan33
description LAN2
ip address 192.168.33.3 255.255.255.0
ip igmp query-interval 20
standby 33 ip 192.168.33.1
standby 33 timers 1 3
standby 33 priority 110
standby 33 preempt
!
Take a look at the other router that is terminating your SVIs. I would wager its IP is 33.3 as well, but it should be 33.2.
Also this interface's IP would have been selected as the router ID because it was either hard coded as the router ID under the OSPF process, or because you do not have a loopback interface. You could try giving the devices a loopback address, as this is best practice for OSPF. After you configure the loopbacks you would need to clear the OSPF possess to get the device to pickup the new router ID.
Hello,
To obtain the the mac-address router/l3 switch
sh arp | in x.x.x.x
sh mac-address | in x.x.x.x
Location of device with ip - L3 switch
sh mac-address address xxxx.xxxx.xxxx
Shutdown the interface and repeat process
if you have a duplicate then it will show up with a different mac-adddress and location
Howerver this could be something else causing this connection loss!
res
Paul
Please don't forget to rate any posts that have been helpful.
Thanks.
Check Switch Logs if you have enable logging buffered you will get duplicate ip address logs in switches.
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