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12-05-2012 09:47 AM
12-05-2012 09:47 AM
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
******************
Hope that helps. Questions?