Grouping of active/active network adapters

I have two 6509 cisco switch

I have configured the two physical network adapters on ESX 4.1 as active/active and they are connected to a NIC in each switch.

That way I have more flow?

How ESX handles the traffic in the pool of active/active NETWORK adapters?

NickHorton wrote:

As I understand it, (even once that caveat, not a network) you cannot extend a vswitch on switch ports without a violation of the spanning tree protocols that disables anything but a port UNLESS your links aggregation switches battery cross. Someone correct me if I'm wrong, please.

You are right. There is some confusion of terms only.

There is a network standard called 802.3ad (working group name) or 802.1AX (real name now, but the name sticks around the working group.) This explains how two units may group several links together and logically to treat them as one. On Cisco switches, this is called an 'association' on the HP Procurve switches, this is called a 'trunk', and on most servers, this is called a "NIC team." On ESX, it is called "IP hash.

Both parties must be configured to do so, otherwise the same MAC address is displayed both on different ports and this would cause various problems, including trouble of Spanning Tree, but also other things.

The 802.3ad has two modes, a static configuration, or dynamics of the aggregation of links. The static method is quite simple, the two sides should only be configured manually. When you use dynamic a certain protocol called LACP is used to negotiate it. Cisco also has its own propertiary Protocol PaGP that does the same thing.

The host ESX/ESXi only has support for aggregation of static links, so this must also be set on the side of the physical switch.

The 802.3ad/802.1AX does not specify HOW loads should be balanced across the available links. It is up to the different units to decide and it could very well be different on two sides of it without problem.

Various switches (physics and also the Vmware vSwitch) uses a method that includes IP addresses in the source and the destination to choose a NIC out this load balancing works well and is quite simple to do, but the boundaries a session between two periods of investigation to a single network adapter. If the connection fails, it will go to another.

Some switches have the possibiliy to use more advanced algorithms to do this, including for example src/dst IP and also the TCP port numbers. It is more "expensive" to do what the package should be inspected deeper and also cause more general CPU, but will allow the load between two IP hosts use multiple network interface cards. It is not supported on the standard vSwitch or the distributed switch, but on the 3rd party Nexus 1000v.

However, all methods is the aggregation of links, some differences in how to place images on the network adapters.

As for using two different physical switches standard does not allow this. Aggregated links must begin and end between the two groups. However, several switch suppliers (for example, Cisco and HP) formed their own solutions for this, called stacked Switch Etherchannel or Trunking distributed for example.

IF you have these switches with this function and if set up correctly on the side of the switch, you can for example set four vmnic "hash IP" on your ESX/ESXi and connect these two physical switches. This would probably be the best combination of fault tolerance and load balancing.

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