02-27-2014 03:20 AM - edited 03-07-2019 06:26 PM
Hi,
I have a problem with MAC flapping on one of my switches. I didn't setup that environment and I founded that recently. I think person which was in company before made there mistake with configuration.
Below here is a picture how it is connected. Basically from server to switch there is 2 cables going and they are using the samne VLAN.
On the picture I pasted config of switchports and output from syslog.
What I'm thinking is to make this two switchport in one EtherChannel using channel-group command. What do You think ??
Best Regards, Jacek
Solved! Go to Solution.
02-27-2014 04:04 AM
Well, I think that etherchannel with "mode on" should work in this kind of environment...give it a try. Also, check on this link if everything about bonding is OK with your linux:
It's for CentOS but I suppose it's similar for every other Linux...
I suppose you know how to configure etherchannel on Cisco side...
HTH,
Dragan
02-27-2014 04:15 AM
Hello
Etherchannel would be a good way to proceed using LACP (channel-mode active) however, in the meantime remove portfast from the access ports and let stp negociate.
res
Paul
Please don't forget to rate any posts that have been helpful.
Thanks.
02-27-2014 03:41 AM
That should be great if your server environment with NICs on it support etherchannel - virtual hypervisor support that with their virtual switches, everything else you typically need NIC vendor software with options to configure etherchannel...
HTH,
Dragan
02-27-2014 03:49 AM
It is a typical Dell server and it has bond setup:
[jtymoczko@lsrv02 ~]$ sudo /sbin/ifconfig
bond1 Link encap:Ethernet HWaddr 00:1B:21:47:2A:FC
inet addr:172.21.21.1 Bcast:172.21.21.3 Mask:255.255.255.252
inet6 addr: fe80::21b:21ff:fe47:2afc/64 Scope:Link
UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1
RX packets:382319127 errors:0 dropped:0 overruns:0 frame:0
TX packets:373617301 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:57752960147 (53.7 GiB) TX bytes:57012937617 (53.0 GiB)
02-27-2014 04:04 AM
Well, I think that etherchannel with "mode on" should work in this kind of environment...give it a try. Also, check on this link if everything about bonding is OK with your linux:
It's for CentOS but I suppose it's similar for every other Linux...
I suppose you know how to configure etherchannel on Cisco side...
HTH,
Dragan
02-27-2014 04:15 AM
Hello
Etherchannel would be a good way to proceed using LACP (channel-mode active) however, in the meantime remove portfast from the access ports and let stp negociate.
res
Paul
Please don't forget to rate any posts that have been helpful.
Thanks.
02-27-2014 04:21 AM
Thanks guys,
Next week I have planned maintenance window and I'm planning to introduce EtherChannel on that.
We will see how it works.
BR, JT
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