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Networking & wireless forum: NIC Teaming

by: girish_networking November 17, 2012 2:13 AM PST

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NIC Teaming

by girish_networking - 11/17/12 2:13 AM

Hi friends.

I have a workstation Dell T3500 with 2 NIC cards installed.
We are using Broadcom Advanced Server Program for teaming both NIC cards on one IP address.

It has been observed that both LAN Connection is enabled,but status(send/receive) of only one LAN connection is updating, whereas the traffic(sent/receive) on another LAN connection established is zero.

Also the icon of LAN connection looks like disabled,but it show's enabled at the bottom.

Kindly Advice

Thanks
Girish


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Never found it to help when.

by R. Proffitt Moderator - 11/17/12 9:48 AM

In Reply to: NIC Teaming by girish_networking

When the cards are on the same LAN it never helped even a little. Since traffic at the lowest level is sent by MAC address what did you do to get traffic to that other NIC?

Sorry if that's a hard question but you are going where users rarely go.
Bob


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Answer Best answer as chosen by user girish_networking

802.3ad

by bill012 - 11/19/12 4:52 AM

In Reply to: NIC Teaming by girish_networking

Its hard to make this work on a server. This feature works better to combine links between core switches.

The worst case that you cannot fix is if the traffic is going back and forth between 2 machine. 802.3ad does not have the ability to load balance traffic it will pick a path based on a combination of mac addresses and ip addresses. Since 2 machines will always have the same ip and mac addresses the traffic will always pick only a single path. It sometime even pick a different path for inbound and outbound but it will always use a single path.

It depends on how your network is structured and how you have this feature configured. You have some option to change which mac and ip it uses. There are some that by default only use only mac addresses which in a routed network means all traffic uses the gateway mac and the machine mac so you only get a single path utilized even for traffic coming from multiple machines.


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Thanks!

by R. Proffitt Moderator - 11/19/12 10:12 AM

In Reply to: 802.3ad by bill012

"This feature works better to combine links between core switches."

Every once in awhile we see folk try this on a LAN.
Bob


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Folk

by joekingsley - 11/28/12 4:46 AM

In Reply to: Thanks! by R. Proffitt Moderator

This feature works better no doubt about that but could you tell us that how they can create a folk.When I am set up this process no folk has been formed on LAN.Could you justify it ?


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No I can't justify NIC teaming on a LAN.

by R. Proffitt Moderator - 11/28/12 9:43 AM

In Reply to: Folk by joekingsley

Such folk that try this tend to get all tied up in knots.
Bob


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