RSPAN Broadcast, impact network intermitten

HI All,
I've configured RSPAN on the customer network.
The impact is, there's a network intermitten on the customer network.
And the source problem is broadcast traffic from the destination port on the RSPAN.
Is anyone found out broadcast problem while configuring RSPAN?
Thansk

Hi Daniel,
Thanks replying.
I'm mirror source from 10 port on one access switch. All the 10 port is connecting 10 IP Phone and 10 PC.
Then the destination port is Server farm switch on port something.
ip phone and pc ---- access switch --- distribution switch --- core switch --- server farm switch --- server recording
After running for several week, we found out network intermitten on the LAN.
Impact is a lot of request time out on when ping to the interface vlan from client pc (on LAN)
The server monitoring found out, broadcast from the source VLAN RSPAN.
I'm wondering to know what is the source problem here, and way to check it out.
Thanks

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Hoopty wrote:
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Hope this helps.
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Hello Rad Mac. Welcome to the Apple Discussions!
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Hi,
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http://www.freesoft.org/CIE/RFC/922/10.htm
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Hello,
Does anybody know if and how much performance impact there is if we use SNC for communication between the SAP Server and SAPGUI?
I think there are two areas that may be impacted; Network and server CPU.
For network load, I did find a part in "Front-End Network Requirements for SAP Business Solutions" document saying "overhead of roughly 350 bytes per user interaction step" but it does not specify the type of encryption. I wonder if there is any other info on this?
For CPU impact, how much overhead should I consider for sapgui access?
I see no field for this in the quicksizer and I can't seem to find any white papers on this subject.
Thank you in advance.

>
Peter Adams wrote:
> Ken,
>
> if you plan to use SAPcryptlib for SNC between SAP servers, then you should use a SAPcryptolib-compatible solution for the SNC communication between SAPGUI and SAP server, and there is only one vendor who can provide this. Let me know, if you need help finding it. My contact information is in my SDN business card.
Just so Kan is clear - It is not legal to use the SAP cryptolib provided by SAP for SNC between SAP GUI and SAP servers, so if x.509 is the desired mechanism you need to purchase additional software from the company which Peter works for to provide SAP GUI SNC-based SSO. I think instead, Kan might be using the free SAP supplied SNC Kerberos library, which is why I asked him to confirm this in my last post. I doubt he is interested to buy any third party software.
> As to the performance discussion: first of all, yes, there will be a small performance impact if SNC is used (no matter which type or implementation), but from our experience with many actual SNC implementations, I can state that this is practically not relevant. It is not noticeable by users. There were never any performance discussions with customers. See also SAP Note 1043694.
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> Just a first quick comment on certain statements above: Tim's arguments for proving his overall statement are not conclusive from my perspective. Nor do I think his overall statement itself is correct.
The facts I mentioned are well known facts, e.g. symmetric crypto is far better from performance point of view than asymmetric. I know the examples I have shown which I found when doing a quick google search were not conclusive, but they were shown as initial examples, not necessarily the best examples. This is why I specifically mentioned that if you search in google yourself you will see many more references where comparisons are done between Kerberos (e.g. symmatric) compared with PKI (e.g. asymmetric).
> First of all, he only selects one aspect of performance - CPU impact of encryption algorithms.
No, I didn't. Some of the examples I referred to also discuss other differences. I also mentioend other differences such as memory and what protection level is used when configuring SNC.
> But for a true comparison, you'd have to look at all relevant aspects (latency, network overhead, ...).
Yes, I agree. No doubts here.
>Network performance overhead is usuallly worse with Kerberos than with PKI.
This is not true. When SAP is using SNC, the GSS-API standard is used and so the only network communication involves SAP software sending a standard GSS token from the workstation to the SAP server, and this GSS token is often about the same size, regardless of which mechanism is used, so any network performance differences are not related to the mechanism, but more related to the complexity of the cryptography used on each end (mostly on the server side).
>Second, you need to look at the specific usage scenario. For example, the first report referenced by Tim is an analysis about different Token Profile mechanism for WS Security, for one specific implementation. This does not allow to draw any conclusion for the SNC use case in general, and for sure not for a specific implemenation. It does not take the overhead for the encryption of the message content into account. Third, Tim associates PKI exclusively with asymmetric encryption. Yes, it is well known that asymmetric algorithms are slower than symmetric ones, but it is also well known that the encryption of the message content (by far the majority of the data) happens with symmetric encryption algorithms in the PKI scenario. With PKI-based SNC, you can even select a symmetric algorithm and use a more performant one that the ones that Kerberos prescribes.
Kerberos works with many different symmetric algorithms as well, so mentioning that the alg is selectable is not relavent to any comparison.
> To summarize, I will try and collect facts that will support the opposite point of view. From our practical experience, the performance overhead is not relevant, and criteria like consistency with SAPcryptolib, strength of security, ease of administration, choice of authentication and encryption mechanism, etc. are much more important.
>
> Peter

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PowerBook G4 12 SuperDrive Mac OS X (10.3.9)

A closed network is still broadcasting and still broadcasts the network name.
A casual user won't be able to see the network from their computer.
However anyone with easily obtained software will be able to see it just fine from their computer.
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1. Dreamweaver is very slow to open on both our laptops and
desktops. The start page menu pops up, but the color-wheel cursor
continues to spin for between one and two minutes before the user
is able to start working in Dreamweaver. If one disables the start
screen, it doesn't happen, but it definitely feels like a bug.
2. Dreamweaver also keeps slowing down our entire server.
We've discovered that Dreamweaver is writing temp files to the
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"jdobbie" <[email protected]> wrote in
message
news:fe18sk$ge7$[email protected]..
> 1. Dreamweaver is very slow to open on both our laptops
and desktops. The
> start page menu pops up, but the color-wheel cursor
continues to spin for
> between one and two minutes before the user is able to
start working in
> Dreamweaver. If one disables the start screen, it
doesn't happen, but it
> definitely feels like a bug.
>
> 2. Dreamweaver also keeps slowing down our entire
server. We've
> discovered
> that Dreamweaver is writing temp files to the server
under ...
> Library/Application Support/Adobe/Dreamweaver
9/Configuration/temp. This
> happens when multiple
> users have Dreamweaver open, and slows down logins and
such for everyone,
> even
> users who do not have Dreamweaver open.
>
> I tried redirecting the temp folder locally, but it did
not improve
> performance.
Hi jdobbie,
I'm just starting to use dreamweaver on the mac, however your
analysis
puzzles me.
Temp files shouldn't have much negative effect on logins, why
do you think
this is causing the slowdowns?
Are your users logging on to the server via Remote Desktop or
VNC or have
you redirected a local folder to a network location?
One thing that may impact network performance is dreamweaver
refreshing the
remote site, or the local site when it's root is on the
network.
Joris

RSPAN Broadcast, impact network intermitten

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