NCIA or TN3270E For Mainframe Access

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3 total messages Started by Steve Entwistle Tue, 11 Jun 1996 00:00

#2004

Author: Steve Entwistle
Date: Tue, 11 Jun 1996 00:00

26 lines
1971 bytes


My company currently has two networks - an SNA (3745, 3174) network
and a Cisco router network. We have 2000+ PCs accessing a large Amdahl
mainframe running MVS. For 'strategic' reasons we are considering
eliminating all the SNA kit and moving to IP as our core protocol,
probably using NCIA or TN3270E and perhaps a Cisco CIP or another IP
gateway solution. I have reservations about both approaches. Firstly,
I believe the current version of NCIA utitilises RSRB and will require
the listing of all PCs MAC addresses in the router configuration
files. I believe there is a new version due which will use DLSw,
however I have been told that a large number of PCs (300+ per site)
acting as DLSw peers to a Cisco 7000 router will cause an unacceptable
load on the router.

My concerns about TN3270E is that it does not provide the full
3270/SNA functionality that our users our used to. (I have no hands-on
experience of TN3270E so I am not sure quite what it's limitations
are).

Has anybody successfully implemented a large rollout of NCIA or
TN3270E ? If so, what problems did you experience along the way ?

Thanks,

Steve

Re: NCIA or TN3270E For Mainframe Access

#2005

Author: Bill Silverthorn
Date: Sat, 15 Jun 1996 00:00

31 lines
2443 bytes

steve@rama.demon.co.uk (Steve Entwistle) wrote:

>My company currently has two networks - an SNA (3745, 3174) network
>and a Cisco router network. We have 2000+ PCs accessing a large Amdahl
>mainframe running MVS. For 'strategic' reasons we are considering
>eliminating all the SNA kit and moving to IP as our core protocol,
>probably using NCIA or TN3270E and perhaps a Cisco CIP or another IP
>gateway solution. I have reservations about both approaches. Firstly,
>I believe the current version of NCIA utitilises RSRB and will require
>the listing of all PCs MAC addresses in the router configuration
>files. I believe there is a new version due which will use DLSw,
>however I have been told that a large number of PCs (300+ per site)
>acting as DLSw peers to a Cisco 7000 router will cause an unacceptable
>load on the router.

>My concerns about TN3270E is that it does not provide the full
>3270/SNA functionality that our users our used to. (I have no hands-on
>experience of TN3270E so I am not sure quite what it's limitations
>are).

>Has anybody successfully implemented a large rollout of NCIA or
>TN3270E ? If so, what problems did you experience along the way ?

Not familiar with NCIA's solution, but I do not believe that CISCO's CIP
supports TN3270E yet.   Apertus Technologies (http://www.apertus.com) has a
data center ready, fault tolerant solution for "E" in either turn key or
software.   There are references on the web page, I believe, or drop me a
line and I can ask for your part of the country or industry.

Bill

Re: NCIA or TN3270E For Mainframe Access

#2006

Author: Mike McNamee
Date: Thu, 20 Jun 1996 00:00

17 lines
1738 bytes

Steve Entwistle (steve@rama.demon.co.uk) wrote:
: 
: TN3270E ? If so, what problems did you experience along the way ?
: 
: Thanks,
: 
: Steve
: 
<snip>

I have been looking at the relative merits of the complete IP to the host approach. TCP/IP on MVS has an large overhead compared to SNA. I would recommend the use of SNA gateways that can send TCP/IP to the data center and then convert to SNA for access
to the host.

There are many products that do this from vendors such as IBM, Microsoft, Attachmate, CNT etc. that can do this.

Emulations that are propietry are functionally better than TN3270/E and I would recommend them also.

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