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New Member

Replacement for 2960S stack (TOR)‏

Hi,



We have a 2960S stack (2 switches) in a remote DC that is getting very close to hitting vlan limit (255) - Any recommendations on a replacement would be greatly appreciated.



Currently using 48 ports (Including 3 SFP ports)...So requirement would be similar port density to what we currently have (Copper 96, SFP 8), but with a lot more vlan's...Im not a huge fan of the 2960's due to small buffers....this may have improved in the latest 2960 range?



The switch is quite busy...peak traffic 400Mb+/sec....so we are pushing the limits of this platform no doubt.

Switch is currently only doing L2.


Certainly not opposed to moving from a 2 switch stack -> 2 individual switches.... 


Cheers. 
  • WAN Routing and Switching
6 REPLIES
Hall of Fame Super Gold

Im not a huge fan of the 2960

Im not a huge fan of the 2960's due to small buffers....this may have improved in the latest 2960 range?

All Catalyst switches have small buffers.  So whether you get 2960X or 3850 or 3650, you'll get buffer overflows because the switches are not designed for DC ToR use.  

We have a 2960S stack (2 switches) in a remote DC that is getting very close to hitting vlan limit (255) - Any recommendations on a replacement would be greatly appreciated.

This is not the question about what switches can support X amount of VLANs.  It's a question about your network design.  If you have a network with >100 VLANs that's not good already.

New Member

 We are a service provider -

 

We are a service provider - we have multiple connections(AGG's) to carriers, and each tail is a new vlan that is presented to us via these AGG's? Some EC's have 50+ tails at this POP....why is having more than 100 vlans "not good"?  

Hall of Fame Super Gold

why is having more than 100

why is having more than 100 vlans "not good"?  

Do you prune your VLANs or do you enable ALL your VLANs to all your switches?  I mean, if your switch has, say, 48 VLANs, do you just configure and enable only 48 VLANS.  You don't enable all >200 VLANs.  

New Member

 We only configure the vlans

 

We only configure the vlans that are active services on this switch stack - i.e. We have over 200 active services coming in via a number of carrier aggs(as vlans) on this switch stack, which are then trunked to a router for L3.

 

We obviously need to upgrade - Just after some recommendations....Are the "new" versions of the lower-end switches any better with buffer size, or is the 4500/4900 range the best option?  

 

 

 

 

Hall of Fame Super Gold

Joseph always recommends 4500

Joseph always recommends 4500-X as a cheaper alternative to Nexus solution.  

Super Bronze

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Posting

I also recommend the 4500 series.  4900 are also better "better" than a 2960/3560/3750 series.  Both might also be better, regarding buffering, than the newer 3650/3850 series too.

BTW, recently, I had to deal with a 3750X with a bunch of iSCSI-SAN hosts - had lots and lots of interface drops.  (Operative word is had - figured out buffer settings that nearly eliminated drops [with QoS enabled]).

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