Re: [j-nsp] EX4300 and full-duplex-only

2015-09-28 Thread Phil Mayers 

On 28/09/15 11:52, Jackson, William wrote:

The ex3300 does not have this limitation.



FWIW, Juniper have come back and said this is a firmware limitation in 
the PHY. Apparently it's some sort of feature conflict or code space 
issue w.r.t. MACSEC, and there is some vague possibility of a release 
with an either/or MACSEC/half-duplex in the future.


:o/

Agree the 3300 has no such limitation.
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Re: [j-nsp] EX4300 and full-duplex-only

2015-09-28 Thread Jackson, William 
The ex3300 does not have this limitation.


William Jackson

Gibtelecom 
Email: william.jack...@gibtele.com 

-Original Message-
From: juniper-nsp [mailto:juniper-nsp-boun...@puck.nether.net] On Behalf Of 
Frank Sweetser
Sent: 23 September 2015 18:05
To: juniper-nsp@puck.nether.net
Subject: Re: [j-nsp] EX4300 and full-duplex-only

On 09/23/2015 09:47 AM, Phil Mayers wrote:
> If you mean "why it's only duplex limitations", I'm guessing the 
> device is missing the collision-detect/retransmit hardware for cost 
> reasons. 10/half is pretty rare these days and, in theory, they're 
> pitched as a datacentre device (though we have an IBM tape library which is 
> 10/half on it's management port).

When I first saw the details about the EX4300, my initial reaction was that it 
was built as a low cost 1Gb dongle for QFabric.

> You can force the link up by disabling autoneg, but that comes up 
> duplex-mismatched - 10/full at the EX end, 10/half at the device end.
>
> All very disappointing; we did not think to specify "must comply with 
> IEEE 802.3" in the RFP :o/


Even putting it in wouldn't have helped unless you verified it yourself anyway
- they list 802.3 support on page 19 of the data sheet:

http://www.juniper.net/assets/us/en/local/pdf/datasheets/1000467-en.pdf

That said, does anyone know if the EX3300 switches suffer from this same design 
decision?

-- 
Frank Sweetser fs at wpi.edu|  For every problem, there is a solution that
Manager of Network Operations   |  is simple, elegant, and wrong.
Worcester Polytechnic Institute |   - HL Mencken
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Re: [j-nsp] EX4300 and full-duplex-only

2015-09-23 Thread Chuck Anderson 
Really?  So you can't use EX4300 at 10 Mbps (I don't know of any
devices that support 10/Full)?  If this is true, it is a
purchase-stopper for us.

On Wed, Sep 23, 2015 at 01:58:36PM +0100, Phil Mayers wrote:
> Does anyone know the backstory to this? We just found out this
> platform doesn't support half-duplex - at all - and it was an
> unpleasant surprise, as it means some old SCADA and instrumentation
> can't link-up against an EX4300.
> 
> I'm assuming they skimped and left out the hardware for detecting RX
> and queueing TX, but wonder if there's something I'm missing.
> 
> Cheers,
> Phil
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[j-nsp] EX4300 and full-duplex-only

2015-09-23 Thread Phil Mayers 
Does anyone know the backstory to this? We just found out this platform 
doesn't support half-duplex - at all - and it was an unpleasant 
surprise, as it means some old SCADA and instrumentation can't link-up 
against an EX4300.


I'm assuming they skimped and left out the hardware for detecting RX and 
queueing TX, but wonder if there's something I'm missing.


Cheers,
Phil
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Re: [j-nsp] EX4300 and full-duplex-only

2015-09-23 Thread Phil Mayers 

On 23/09/15 14:38, Peter Tavenier wrote:


There is only a note of duplex, not about the speed:


Indeed.


Note: On EX4300 switches, the interfaces operate in full duplex mode only.

I do see on a EX4300 some links in 100Mb and 1000Mb, don’t have 10Mb devices 
attached.

Not sure why this is.


If you mean "why it's only duplex limitations", I'm guessing the device 
is missing the collision-detect/retransmit hardware for cost reasons. 
10/half is pretty rare these days and, in theory, they're pitched as a 
datacentre device (though we have an IBM tape library which is 10/half 
on it's management port).


You can force the link up by disabling autoneg, but that comes up 
duplex-mismatched - 10/full at the EX end, 10/half at the device end.


All very disappointing; we did not think to specify "must comply with 
IEEE 802.3" in the RFP :o/

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Re: [j-nsp] EX4300 and full-duplex-only

2015-09-23 Thread Peter Tavenier 
> On 23 Sep 2015, at 15:30, Chuck Anderson  wrote:
> 
> Really?  So you can't use EX4300 at 10 Mbps (I don't know of any
> devices that support 10/Full)?  If this is true, it is a
> purchase-stopper for us.
> 
> On Wed, Sep 23, 2015 at 01:58:36PM +0100, Phil Mayers wrote:
>> Does anyone know the backstory to this? We just found out this
>> platform doesn't support half-duplex - at all - and it was an
>> unpleasant surprise, as it means some old SCADA and instrumentation
>> can't link-up against an EX4300.
>> 
>> I'm assuming they skimped and left out the hardware for detecting RX
>> and queueing TX, but wonder if there's something I'm missing.

On the link: 
http://www.juniper.net/documentation/en_US/junos13.2/topics/task/configuration/ex-series-gigabit-interfaces-cli-els.html#jd0e111

There is only a note of duplex, not about the speed: 
Note: On EX4300 switches, the interfaces operate in full duplex mode only.

I do see on a EX4300 some links in 100Mb and 1000Mb, don’t have 10Mb devices 
attached. 

Not sure why this is. 


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Re: [j-nsp] EX4300 and full-duplex-only

2015-09-23 Thread Phil Mayers 

On 23/09/15 14:30, Chuck Anderson wrote:

Really?  So you can't use EX4300 at 10 Mbps (I don't know of any
devices that support 10/Full)?  If this is true, it is a
purchase-stopper for us.


10/full works fine.

10/half (or 100/half) does NOT work:

http://www.juniper.net/documentation/en_US/junos13.2/topics/task/configuration/ex-series-gigabit-interfaces-cli-els.html

"""
Note: On EX4300 switches, the interfaces operate in full duplex mode only.
"""

We've confirmed this by inspecting the autoneg caps advertised from the 
device; all half-duplex modes are absent.

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