Layer 2 switch decision and NIC teaming/switch redundancy

Answered Question
May 23rd, 2007


Imagine I need to provide a reliable network environment between two mainframes.

Basically there is an 'intra' NIC communication between the two mainframes. Such 'intracommunication' NIC could be connected in an isolated switched environment as long that supports 1GB. The idea is, instead of using a VLAN in our existing production environment in order to allow communication between the two mainframes, folks would like to use a small switch instead, totally isolated from the network to provide such intra-NIC communication service between the two mainframes. My questions are:

a) Do you agree that typically by keeping a separate switch (perhaps a new layer 2 2900 XL ?) I could provide a more reliable environment than if I plug the servers onto new VLANs in my existing 3750 switch? Note that my 3750 switch in production is not a stackwise. It is just a standalone one.

b) Can a small 2900XL switch (8 ports?) do 1000MB? Also, I recommended that we use copper instead of fiber for this.

c) In the past I heard people talking about problems with teaming itself. I am wondering whether if I just use one Gigabit NIC, copper, I will be offer. Again, please let me know in case the layer 2900 XL switches do not handle gigabit.

Your insight is very valuable. Thanks.

I have this problem too.
0 votes
Correct Answer by Amit Singh about 9 years 5 months ago

Yes, 2960 should suffice your need in that case. It has 24 port and 48 port 10/100/1000 port version as well.

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Overall Rating: 5 (1 ratings)
glen.grant Wed, 05/23/2007 - 08:12

2900's are end of life and do not handle gigabit . If you are just looking to give the 2 mainframes a common connection point then i don't see any problem with just creating a common layer 2 vlan on the existing 3750 .

news2010a Wed, 05/23/2007 - 08:30

Good point regarding the end of life.

How about the 2960, as posted below? That one can do 1000MB and I see is a more recent product, right? I just learned that the 3750 is very limited in port availability. Therefore I would need to justify the purchase of an additional 3750 ofr this, or I should stick with an isolated small layer 2 switch.


7 10/100/1000 + 1 Dual Purpose Gigabit Ethernet Uplink, LAN Base Image

Correct Answer
Amit Singh Wed, 05/23/2007 - 08:37

Yes, 2960 should suffice your need in that case. It has 24 port and 48 port 10/100/1000 port version as well.


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