[25448] in North American Network Operators' Group
Re: how to waste fiber (was:OT:MarketSpeak)
daemon@ATHENA.MIT.EDU (Danny McPherson)
Wed Oct 13 16:37:50 1999
Message-Id: <199910131934.NAA06856@ice.ip.qwest.net>
To: nanog@merit.edu
From: Danny McPherson <danny@qwest.net>
Reply-To: danny@ice.ip.qwest.net
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Date: Wed, 13 Oct 1999 13:34:31 -0600
Errors-To: owner-nanog-outgoing@merit.edu
>
> > 50ms is fast? You'd drop sevral packets I'd guess.
>
> easily survivable. but will bgp flap?
sure, if your BGP holdtime is less than 50ms :-)
On a series note, GR253 specs it at 50ms. Convergence in regional rings,
however, is often more a function of propagation delay, and more
realistically, with larger-than-probably-should-be rings expect times more
around the 100ms range.
As for how it'd look on your router, assuming a trunk failure, you'd likely
see a bunch of CRC or frame errors on the interface, and an array of SONET
errors on the controller. Then, presumably, you'd see a bit more latency on
the connection while running on the usually less-optimally-routed protect path.
Of course, more interesting than presumably transparent trunk failures in
relation to SONET protection, are trib failures with inter-router APS on the
trib side. This requires a bit more attention to detail (speaking from
experience).
-danny
