[j-nsp] MX240 SCBE2 10G ports

[Chuck Anderson]

On Wed, Aug 19, 2015 at 12:14:03PM -0700, Michael Loftis wrote:
> On Wed, Aug 19, 2015 at 9:09 AM, Chuck Anderson <cra at wpi.edu> wrote:
> > On Wed, Aug 19, 2015 at 11:43:43AM -0400, Phil Rosenthal wrote:
> >> I suggest you bring this up with your Juniper sales rep :)
> >>
> >> Juniper is very much driven by customer feedback.
> >
> > I wonder if these ports are connected to a PFE, or if they are
> > direct-to-RE ports.  If the latter, they may never be usable as
> > revenue ports but they might make it easier for Juniper to implement
> > external routing engines or distributed/clustering technologies like
> > the TX Matrix Plus with the Line Card Chassis.  This is just a guess.
> 
> I personally would actually bet that's what it was/is for.  Linking
> the chassis internal network that carries the management.  It's
> probably hanging off the management switching system on the fabric
> cards, not on the fabric itself.

I happened to have a spare SCBE2 card so I did a few experiments in
the lab.  This mentions one XE and one GE port, not two XE ports, so
I'm not sure if these are the SCB external SFP+ ports or what:

root at mx> show chassis ethernet-switch statistics | find External
Link is down on XE port 24 connected to device: External-Ethernet

Link is down on GE port 25 connected to device: External-Ethernet

root at mx> show chassis ethernet-switch | find External
Error reading port 24 connected to device: External-Ethernet

Error reading port 25 connected to device: External-Ethernet

I can't get those links to say "up" after putting a fiber loop on the
SFP+ module, so maybe they are something else.

Installing an SFP+ module in the SCB causes this to show up in
chassisd log (first port 0 then port 1):

Aug 21 12:19:29  bcom_563xx_sfps_autosense: jcs.0  is_present: 0 -> 1
Aug 21 12:19:29  bcom_563xx_sfps_autosense: jcs.0  sfp_new -> true
Aug 21 12:19:34  cbd_read_sfp_ideeprom_all: sfp_presence 0x01, cbd_sfp_presence 0x00
Aug 21 12:28:54  bcom_563xx_sfps_autosense: jcs.0  is_present: 1 -> 0

Aug 21 12:28:54  cbd_read_sfp_ideeprom_all: sfp_presence 0x00, cbd_sfp_presence 0x01
Aug 21 12:29:00  bcom_563xx_sfps_autosense: jcs.1  is_present: 0 -> 1
Aug 21 12:29:00  bcom_563xx_sfps_autosense: jcs.1  sfp_new -> true
Aug 21 12:29:04  cbd_read_sfp_ideeprom_all: sfp_presence 0x02, cbd_sfp_presence 0x00

and this shows up in "show chassis hardware":

CB 1             REV 03   750-055976   xxxxxxxx          Enhanced MX SCB 2
  Xcvr 1         REV 01   740-031981   xxxxxxxx          SFP+-10G-LR

I had another thought--aren't these same SCB's used on the big SRX
boxes?  Maybe these could be used as Control Links for those...