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Question on how Virtual Connect do loop detection and avoidance.

 
chuckk281
Trusted Contributor

Question on how Virtual Connect do loop detection and avoidance.

Chris had loop avaoidance question on Virtual Connect;

 

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I am being asked again how VC modules prevent a loop when VC modules are in Active-Active mode and the customer is using Linux NIC bonding.

 

They have explained that the MAC address for eth0 is visible through VC-B and are asking what Loop prevention mechanism the VC modules are using?

Is the MAC address being transported across the VC module interconnects in this scenario?

 

They have a LAN defined that includes VC0 and VC1 and eth0.

 

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Lee replied:

 

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There’s an internal loop avoidance mechanism.  This is what is really does to the tags and a visual representation of each scenario.

 

 

–      We will never activate 2 uplinks connected to the same vNet

–      vNet can be thought of as vlan in traditional switching

              > We put a second vlan tag on packets traversing the virtual connect networks.

                        - We do not modify the original vlan tag

              > We are a layer-2 device; we cannot pass traffic between vlans

 

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Hope that helps. Questions?