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

    Tuning BGP hold-queue on transit routers

    Stephen

      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

        • 1. Re: Tuning BGP hold-queue on transit routers
          jguagliata

          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.