[rrg] an example of convergence

[Pekka Savola <[e-mail]>]

On Mon, 15 Mar 2010, Tony Li wrote:
> <employer hat off>
> Any operator who would like to stand up and embarrass their favorite router
> vendor by showing a graph of router boot convergence times is welcome to do
> so.  ;-)
> </employer hat off>

Ok, I'll jump on my soap box.  In worst case, Juniper high-end routers 
have been demonstrated to take up to 10 minutes to install RIB to FIB. 
During this time, packets usually get blackholed (aka "krt queue 
blocking").  See thread in j-nsp in Dec 2009:

http://www.mail-archive.com/[e-mail]/msg07663.html

A bit of continuation here:

http://www.mail-archive.com/[e-mail]/msg07833.html

This is not a new issue;  It has started appearing over 3 years ago:

http://puck.nether.net/pipermail/juniper-nsp/2007-February/007655.html
http://puck.nether.net/pipermail/juniper-nsp/2007-February/007575.html

I've personally pursued a case with Juniper TAC on this for a long 
time but eventually gave up.  One known architectural bottleneck is 
the slowness of RE-PFE IPC (unix socket), but I don't really belive in 
this being the root cause.  I know others have also tried to work with 
the vendor to get this fixed.

Semi-relevant may also be a graph of BGP update sizes during a BGP DFZ 
flap event that I sent to idr list three years back, showing that of 
87K BGP updates due to a single event, almost all of them are below 
100 bytes in size.

http://www.ietf.org/mail-archive/web/idr/current/msg02398.html

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings