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NIC teaming with Broadcom NIC on Cisco switch

Posted on 2009-02-12
Medium Priority
Last Modified: 2012-06-25
I have setup NIC teaming in the Broadcom software, with both NIC's attached to a Cisco 4510, and the etherchannel setup.  Both NIC's are 1GB.  However the link speed of the team is showing as 1 GB.  Also, when looking at the status of the two NIC's only one is showing any significant activity.  Does anyone have any ideas why it's not showing 2 GB and using both NIC's?
Question by:RoryMcC
LVL 21

Expert Comment

ID: 23622366
what kind of link aggregation you set up?
You should choose performance+redundancy with LACP
Then you should configure etherchannel also with lacp
conf t
int gi0/1
desc first_nic
channel-group mode passive
int gi0/2
desc second_nic
channel-group mode passive

int po1
switchport mode access
switchport access vlan XX <- put correct vlan number here


you can see, that cisco side is configured with lacp passive, so broadcoms should be configured with lacp active
LVL 26

Accepted Solution

lnkevin earned 1500 total points
ID: 23622694
with both NIC's attached to a Cisco 4510....

What is the purpose of connecting to NICs to one switch? Load balancing?

If you have the two NICs connect in a managed switch with different Vlan, your NIC teaming must be in fault tolerant (failover) mode instead of load balancing. The common practice of failover is each NIC port connects to a different switch so if one switch goes down, other will pick up.

why it's not showing 2 GB and using both NIC's?
Link speed is not a sum of speed. If the link speed on your interface is 1GB, it's the maximum of link speed aprx. 1GB substract network overhead regardless the number of NICs in a team. So if you team 4 nics together, the link speed is still 1GB. If you have it load balancing, you will still have it 1GB but you have more room for traffic load.


Author Comment

ID: 23623111
OK, thanks exp, that is the way I had it configured.


Yes, it's for load balancing.  It's a backup server and could see the NIC hitting 100% sometimes so I though I'd try teaming the NIC's to see if it improved performance.  Thanks for the explanation.

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