[c-nsp] Operational impact of switching from ingress to egress replication mode

Tim Stevenson tstevens at cisco.com
Tue Sep 21 14:46:56 EDT 2010

Hi John,
Switching replication modes basically purges the hardware of all 
mroutes and those will be reprogrammed based on the current software 
state. It will be potentially disruptive for all mroutes, but the 
exact amount of traffic loss/blackholing would depend on the rate of 
each stream at the time, and the overall amount of time it takes to 
reprogram. For a few 100 mroutes, I would not expect much impact.

Hope that helps,

At 11:30 AM 9/21/2010, John Neiberger averred:

>We're running 12.2(33)SRC2, I believe. It's actually experimental code
>and the exact version is overwritten with another code.
>On Tue, Sep 21, 2010 at 12:04 PM, Jeffrey Pazahanick 
><jeffpaz at gmail.com> wrote:
> > John,
> > Having switched back and forth a few times, I never noticed more than
> > a 1-2 second outage.
> > What version of code are you on?
> >
> > On Tue, Sep 21, 2010 at 11:59 AM, John Neiberger 
> <jneiberger at gmail.com> wrote:
> >> We're going to be doing a whole bunch of maintenance tonight during a
> >> maintenance window. One of the many things on our plate is to switch
> >> from ingress replication mode to egress on some 7600s that have a few
> >> hundred multicast routes on them. We know there is going to be at
> >> least a minor blip while things settle down after making the change,
> >> but I wanted to see if anyone on the list has done this and what the
> >> operational impact was. I've heard there will be slight interruption
> >> in traffic, but what sort of interruption are we talking about? Are we
> >> speaking about a second or two?
> >>
> >> I'm asking because we're trying to decide if we want to split this out
> >> to another night. If the disruption is minor and the risk is low then
> >> we'll do it tonight. Otherwise, we might choose to do it on a separate
> >> night.
> >>
> >> Any thoughts?
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Distinguished Technical Marketing Engineer, Cisco Nexus 7000
Cisco - http://www.cisco.com
IP Phone: 408-526-6759
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