I think that was addressed earlier in this thread, there was a conversation about a ISR's pps capacity and how it relates to the PRIs that can be terminated to it. Right now, looks like the the 3 qty 2811 routers will have 2 PRIs each, but there's a strong chance that we're going to upgrade to a stronger ISR model anyhow since we're doing plain vanilla and need to provision for a worst case scenario.
On Thu, Sep 24, 2009 at 3:06 PM, Hardesty, Scott <sharde...@presidio.com>wrote: > > > Another consideration is the calls per second for each gateway. Just > because you can terminate 4 PRI circuits on a single ISR that does not mean > that it is non-blocking. I installed a call center solution a few years > back using 2821 router w/ 3 xT1 connections in each. The inbound call > volume crashed the routers because of the CPU interrupts from the ISDN > signaling. We ended up moving to 3845 routers to terminate the 3xT1 > connections to support the call volume. For standard office environments > this should not be an issue but be careful if you are working at a location > that has HIGH call volumes. > > > > > > *Scott Hardesty | Solutions Engineer | MidAtlantic | Presidio Networked > Solutions* > > *7601 Ora Glen Drive, Suite 100, Greenbelt, MD 20770 | > sharde...@presidio.com* > > *D: 301.313.2041 | C: 443.789.1219 | www.presidio.com* > > ** > > > > ------------------------------ > > *From:* ccie_voice-boun...@onlinestudylist.com [mailto: > ccie_voice-boun...@onlinestudylist.com] *On Behalf Of *shikamaru > *Sent:* Thursday, September 24, 2009 11:45 AM > *To:* groganhockey > *Cc:* OSL Group > *Subject:* Re: [OSL | CCIE_Voice] Choosing the right ISR? > > > > Haha, I can do better than that! I've downloaded it! ;) > > On Thu, Sep 24, 2009 at 8:19 AM, groganhockey <groganhoc...@gmail.com> > wrote: > > I'm just glad I can finally contribute *something* to these discussions! :) > > FYI, cisco has moved the doc in the past, so make sure you remember the > title in case it moves again. > > mike > > > > On Thu, Sep 24, 2009 at 9:38 AM, shikamaru <shikam...@kagadis.com> wrote: > > MUCH respect, Mike. This is the perfect document for this kind of > question. Thank you. > > > > On Wed, Sep 23, 2009 at 7:29 PM, mike deal <groganhoc...@gmail.com> wrote: > > I've used this document in the past for sizing purposes: > > http://www.cisco.com/en/US/prod/collateral/routers/ps259/product_data_sheet0900aecd8057f2e0.pdf > > mike > > On Wed, Sep 23, 2009 at 7:59 PM, Nara Shikamaru <shikam...@kagadis.com> > wrote: > > I had no idea there was a PRI limit. I was thinking, potentially, I may > need to terminate 8 PRIs on a 2811 but in truth I'm planning on having 3 > 2811 for redundancy and spread the span against all three. Plenty of ports > between them. > > > > I guess my question was also whether the 2811 can handle this kind of > scenario, but then if it couldn't I don't think Cisco would allow for 4 PRIs > to be terminated to it. I'll ask my AM tomorrow. Thanks, Michael. > > On Wed, Sep 23, 2009 at 5:26 PM, Michael Ciarfello <mciarfe...@iplogic.com> > wrote: > > Each ISR router is supposed to only be able to handle X number of PRIs (not > physical, more CPU / resource load wise.) I would work with your Cisco AM > to have them help you detemine what the limits and loading are. > > > > I can't find what documents discussed it. I know I came across a > third-party testing report (Mircom maybe.) that had like max 4 PRIs on a > 2811. My number might be off, but there was a limit. That's why I would > suggest working with your Cisco AM--they should be able to help with those > numbers. > > > > If you are a partner, the PDI helpdesk should be able to help. If not, > then that's what the AM will help you with. Not sure if TAC would assist > with these design questions, but you can always try. > ------------------------------ > > *From:* ccie_voice-boun...@onlinestudylist.com [ > ccie_voice-boun...@onlinestudylist.com] On Behalf Of Nara Shikamaru [ > shikam...@kagadis.com] > *Sent:* Wednesday, September 23, 2009 12:01 PM > > > *To:* OSL Group > *Subject:* [OSL | CCIE_Voice] Choosing the right ISR? > > > > Okay, my question is not really out of the modules, just a question about a > real world scenario. I'm preparing to increase the size of our VoIP network > and am aware of the principle differences between the ISRs. Our remote sites > will have subscribers, so SRST is not really an issue, and the ISRs are only > being used to terminate PRIs and will not be used to route data VLAN > traffic. This being the case, are there caveats to using 2811 routers with 8 > VWIC ports? I don't really know what to expect by way of offnet traffic, but > have had success with the 2811 line and am wondering if I can repurpose for > the new network and not have too much to worry about. > > Also, I am planning on configuring some hardware conferencing but I have no > idea yet how popular it will be, no transcoding is planned as our sites are > currently all on G711. > > > > > > > > -- > -Shikamaru > > > > > > -- > -Shikamaru > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > > > > > > > -- > -Shikamaru > > > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > > > > -- > -Shikamaru > > -- -Shikamaru
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
