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List:       cisco-nsp
Subject:    Re: [nsp] High CPU load causes HSSI protocol to drop - 11.1.17CA1 & CX-HIP
From:       Andrew Smith <awsmith () rip ! ops ! neosoft ! com>
Date:       1998-03-29 9:53:29
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> 
> I posted about this before in the context of FR over HSSI and Greg Ketell
> posted some useful stuff back, but the problem is wider and repeatable.
> I don't know if anyone else has seen this.
> 
> 7513 & 7507, running 11.1.12CA1, 11.1.15CA1 and 11.1.17CA1 with CX-HIP,
> both under point to point HDLC through Digilinks, and running FR
> into a Cascade FR switch, appear to drop line protocol when the router
> hits high CPU load (for instance through oscillating lines or BGP
> recalculation). As this causes oscillating lines and BGP recalculation,
> this is a bad thing.
> 
> Has anyone else seen this? (Bug Navigator hasn't). Does anyone have a fix?
> I have increased the broadcast queues and played with various LMI timers
> for the FR stuff which mitigated the problem a little on the FR side.
> It appears to be perfectly repeatable (unfortunately today gave me the
> chance to test this...)
> 
> -- 
> Alex Bligh
> GX Networks (formerly Xara Networks)
> 

I had this problem on a 7513 when I upgraded to 11.1.17CA from
11.1.10aCA1 with a CX HSSI. I am not running frame on this and
TAC has yet to respond with exactly what the problem was.
(Since then, I have gone to no keepalive on the interface
but am not brave enough to try the upgrade again)

---------------------------------------------------------------------------
  ** Andrew W. Smith ** awsmith@neosoft.com ** Chief Network Engineer **
    ** http://www.neosoft.com/neosoft/staff/andrew ** 1-888-NEOSOFT **
       ** "Opportunities multiply as they are seized" - Sun Tzu **
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