Paktusjet
asked on
stp error/fix?
Howdy,
I recently installed a new 4503 switch. When I hooked my server up to it I received this error on the switch:
%C4K_EBM-4-HOSTFLAPPING: Host cc.cc.cc.cc.cc.cc in vlan 50 is flapping between port Gi3/15 and port Gi3/6
now the server has a bridged NIC. Is there a workaround besides NIC teaming to fix this problem? and yes this is about the second time I asked this question :) Sorry for the repeat but I need this one fixed hopefully fast :p
I recently installed a new 4503 switch. When I hooked my server up to it I received this error on the switch:
%C4K_EBM-4-HOSTFLAPPING: Host cc.cc.cc.cc.cc.cc in vlan 50 is flapping between port Gi3/15 and port Gi3/6
now the server has a bridged NIC. Is there a workaround besides NIC teaming to fix this problem? and yes this is about the second time I asked this question :) Sorry for the repeat but I need this one fixed hopefully fast :p
ASKER
well I was using a c3750g and it worked fine no errors... and the network was stable... But when I put this bad boy 4503 in... He did not like that... So now I'm at this spot:
I have to get this switch to stop flapping with that error.
I have no free IP addresses to assign to this NIC.
I'm on a count down timer to get this fixed.
And my server does not support NIC teaming.
So if it worked on a 3750g It should work on a 4503. I know you think this is impossible, but I've seen this work for a long time.. only thing is I dont know how they set it up.
I have to get this switch to stop flapping with that error.
I have no free IP addresses to assign to this NIC.
I'm on a count down timer to get this fixed.
And my server does not support NIC teaming.
So if it worked on a 3750g It should work on a 4503. I know you think this is impossible, but I've seen this work for a long time.. only thing is I dont know how they set it up.
you have the same mac address set up on both NIC cards in the server. This is a form of NIC teaming?
Can i jsut ask,
I think you have one ip address for the two nic's?
and have assigened the same mac address to both nics?
can you jsut confirm that is correct?
Can i jsut ask,
I think you have one ip address for the two nic's?
and have assigened the same mac address to both nics?
can you jsut confirm that is correct?
ASKER
well when you bridge two nics together, they use the most primary mac address for both which is what nic teaming doesnt do. NIC teaming uses one IP address but each nic holds it's respective mac address. But.. my servers do not support nic teaming.
So yes one IP address for both nics and since there bridged it's one MAC address. Now keeping that in mind I asked this on another post that I put up and asked if there was a way to set STP to block one port until the other goes down.. which in case this one will change to forwarding. But all I got was that cannot be done. So thinking with a cisco mind they must of set something up so this is possible.
So yes one IP address for both nics and since there bridged it's one MAC address. Now keeping that in mind I asked this on another post that I put up and asked if there was a way to set STP to block one port until the other goes down.. which in case this one will change to forwarding. But all I got was that cannot be done. So thinking with a cisco mind they must of set something up so this is possible.
ASKER CERTIFIED SOLUTION
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ASKER
well the errors stopped but... Now I cant get one of my servers to talk to the one thats port channeled.
configs:
Switch(config-if)#spanning
Switch(config-if)#channel-
Switch(config-if)#port-cha
interface GigabitEthernet1/1
switchport access vlan 40
channel-group mode active
spanning-tree portfast
!
!
interface GigabitEthernet1/5
switchport access vlan 40
channel-group mode active
spanning-tree portfast
The other server is on vlan 40 but it cant ping the portchanneled server... Everything can ping this server but this one cannot ping the portchanneled server. But when we take it off it works :/
any suggestion?
configs:
Switch(config-if)#spanning
Switch(config-if)#channel-
Switch(config-if)#port-cha
interface GigabitEthernet1/1
switchport access vlan 40
channel-group mode active
spanning-tree portfast
!
!
interface GigabitEthernet1/5
switchport access vlan 40
channel-group mode active
spanning-tree portfast
The other server is on vlan 40 but it cant ping the portchanneled server... Everything can ping this server but this one cannot ping the portchanneled server. But when we take it off it works :/
any suggestion?
hold on if every thing else can ping this server. then i would suggest it is not a problem with the port channeled server. but with the one that can't ping it?
double check vlans and trunking info..
double check vlans and trunking info..
ASKER
I read in on the 802.3ad and basically pointed me to ether channeling and we found a HP software to "Team" our NICs :) thanks for the help. Now I know I stated we can't NIC Team but we were able to find software for it.
glad you got it sorted :)
but to be honest you are asking a switch to do something impossible. If you dont team the ports. how dose the switch know what one to use if the Mac address on each is the same??
you are telling it not to load balanace, but it has to.
A switch learns mac address and forms a mac address table telling it where to forward data to. if it has the same mac address on two ports it cant do this. It will try to use one at a time. and each time it runs an arp it will reupdate its mac address table to use one or the other.
not a good configuration....