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667 Views 1 Reply Latest reply: Feb 27, 2012 6:17 AM by jguagliata RSS

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Tuning BGP hold-queue on transit routers

Feb 23, 2012 12:58 PM

Stephen 488 posts since
Apr 22, 2011

Hi guys,

 

I've been reading about tuning bgp in various aspects.  Come across the hold-queue, and wondering if you have any recommendations?  I just checked the hold-queue at work on one of the two transit routers and can see:

 

Input queue: 0/75/67/67 (size/max/drops/flushes); Total output drops: 0

 

Where I'm guessing 75 is gonna be the limit on input packets.  I'm wondering what needs to be taken into consideration before increasing it to the max value, say like 4096?  And what views you guys have with fiddling with this value in order to reduce discarded packets with bgp convergence?

 

 

Regards,

Stephen

  • jguagliata 2 posts since
    Aug 22, 2009
    Currently Being Moderated
    1. Feb 27, 2012 6:17 AM (in response to Stephen)
    Re: Tuning BGP hold-queue on transit routers

    For your input queue, total output drops is 0 which means your queue size is sufficent.

     

    If you saw something like the following a little while after a reload, then you would need to increase the value.

    Input queue: 0/75/67/67 (size/max/drops/flushes); Total output drops: 98771

     

    My recommendation would be to leave it alone, unless you start experiencing a large amount of drops quickly. This shouldn't be a concern unless you have many bgp peers.


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