[j-nsp] System board memory expansion on M7i

[Chris Kawchuk]

Gotcha,

You are correct. cFEB can be either 128 or 256. Again, since the cFEB
has all the actual forwarding routes for the router's ASIC's, you mya be
able to get away with only 128M for now, but again, as the global
routing table gets bigger and bigger, you may run into a limit.

Likewise, if you start adding L3VPNs, and add more and more MPLS/VPN
routes,  you will run into the 128 Mb limit quickly.

Hence, 256M is strongly recommended.

- Chris.


-----Original Message-----
From: Rubens Kuhl Jr. [mailto:rubensk at gmail.com] 
Sent: Thursday, November 01, 2007 11:01 AM
To: Chris Kawchuk
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] System board memory expansion on M7i

Chris,

I always intended to fill-up RE memory with 768MB or more. My question
was about CFEB memory, not RE memory... I stated that it can be ordered
with 256 MB or 512 MB, but it's actually 128 MB or 256 MB. The
MEM-FEB-256-S is an upgrade to 256 MB, not a 256MB increase.


Rubens



On 11/1/07, Chris Kawchuk <ckawchuk at juniper.net> wrote:
> Hi Rubens,
>
> JunOS 9.0+ will require > 256MB of RAM on the routing engines to load 
> properly. JunOS 9.0 is expected to be released in Q1 2008.
>
> Notes from the Juniper PSN:
> ---
> PSN Issue: The RE-400-256 Routing Engine contains only 256MB of main 
> memory. Beginning with JUNOS release 9.0, this is insufficient to run 
> JUNOS software; the minimum supported main memory configuration for 
> JUNOS 9.0 and above is 768MB.
>
> Solution 1: The RE-400-256 Routing Engine is replaced with the 
> RE-400-768. This new Routing Engine model includes 768MB of main 
> memory, which meets the new minimum requirement.
>
> Solution 2: Implementation Customers with RE-400-256 Routing Engines 
> are strongly urged to upgrade those Routing Engines to RE-400-768 
> before installing JUNOS release 9.0 or higher. This upgrade is 
> accomplished by installing two MEM-RE-256-S memory upgrade modules.
> ---
>
> Hence, you will need to upgrade your RE-400's to 768 Mb of RAM on a 
> go-forward basis in order to load the newer JunOS images starting in 
> 2008. On a side note, I *always* suggest loading any router with the 
> maximum amount of memory, since the Global Internet routing table 
> isn't getting any smaller.... =)
>
> - Chris.
>
> ____________________________________
> Chris Kawchuk (ckawchuk at juniper.net)
> Systems Engineering, Service Providers Juniper Networks Inc., Canada
> local:     +1 (403) 470-8174
> toll-free: +1 (866) 470-8174
>
>
> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Rubens Kuhl
> Jr.
> Sent: Thursday, November 01, 2007 9:27 AM
> To: juniper-nsp at puck.nether.net
> Subject: [j-nsp] System board memory expansion on M7i
>
> Hi.
>
> M7i routers can be ordered with 256 or 512 MB RAM system board memory;
> any guidelines on what usage scenarios would make 512MB desirable or
> even mandatory ?
>
> Our need is a Internet router with 3 full-routing transit feeds and a
> bunch of peering connections that made us specify more memory for the
> routing engine, but that may or may not impact forwarding engine
> requirements. AS and J-Flow are already included in the RFP.
>
>
> Rubens
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