Wired Intelligent Edge

 View Only
  • 1.  2 x 2930F in VSF Chain with single DAC cable

    Posted Jan 02, 2020 10:34 AM

    Hi,

    I have several building in a fairly large campus and in many buildings I use 2 x Aruba 2930F in VSF Chain using a single 10GB DAC cable.  I just realized something, am I supposed to use two DAC cables? Yikes!


    Does practice consider this a mis-configuration? If this is OK and not risky can I leave it as-is or should I immediately get a second DAC cables and connect another 10GB link?

     

    Current Config Example:

    enable domain 808
    member 1
    type "JL256A" mac-address 9020c2-b15a40
    priority 131
    link 1 1/49
    link 1 name "I-Link1_1"
    link 2 name "I-Link1_2"
    exit
    member 2
    type "JL256A" mac-address 9020c2-b584c0
    priority 130
    link 1 2/50
    link 1 name "I-Link2_1"
    link 2 name "I-Link2_2"
    exit

     

    VSF Member: 1 Link: 1

    Port State
    -------- ------------
    1/49 Up: Connected to port 2/50

     

    VSF Member: 2 Link: 1

    Port State
    -------- ------------
    2/50 Up: Connected to port 1/49

     

    Thank you,

    You guys are awesome!



  • 2.  RE: 2 x 2930F in VSF Chain with single DAC cable

    Posted Jan 02, 2020 11:31 AM

    Hi,


    it is supported but it is always better to have 2 cable ! (for redundancy and perf )



  • 3.  RE: 2 x 2930F in VSF Chain with single DAC cable

    Posted Jan 02, 2020 11:43 AM

    May I asked for some examples of why it impacts performance? Major? Would it cause latency between buildings or locally within the domain? In other words just looking for pros and cons with regard to performance.  I understand redundancy.  The buildings where we only have a single link are vey small where we have two servers VM Hosts.  One host has Windows DFS and Domain Controller and the other host is for replicas.  As far as users in these smaller buildings I saw we have about 50 tops.  My concern is now performance between buildings.  We have 10GB links between buildings back to core.  Some are on MPLS circuits back to the core.



  • 4.  RE: 2 x 2930F in VSF Chain with single DAC cable
    Best Answer

    Posted Jan 02, 2020 11:56 AM

    You are limited to 10Gbits between traffic on the 2 switch...

     

    If there is no traffic inside port of the switch, it will not be a problem !



  • 5.  RE: 2 x 2930F in VSF Chain with single DAC cable

    Posted Jan 02, 2020 01:10 PM

    Greetings!

     

    Using a single DAC for your VSF link limits bandwidth between your VSF members to 10Gbps; as long as the amount of traffic required to transit the VSF link (e.g., devices connected to member 2 with the stack uplink on member 1) does not exceed that figure, you should be just fine.

     

    If you find that you are running into bandwidth limitations, and you have at least one other SFP+ port available on each VSF member, you can simply add a second port pair to the existing VSF link (don't configure a second link if there are only 2 members) and connect a second DAC between those ports to double the available bandwidth.