Question of the Day
Why Cisco has restriction in number of spanning sessions? Is there any other solution available to have unlimited spanning seesions for both Tx/Rx?
Also , is there any solution which does the spanning based on source or destination based ip address? for e.g. if the source ip address is 1.1.1.1 throw the traffic to destination port 1. if source ip address is 2.2.2.2 put the throw to destination port 2.
for more info on CCNA Training and CCNA Certification and more Cisco exams log in to Certkingdom.com
Expert’s answer
While I may not be able to give you Cisco’s exact reason for having a limit on the number of port spanning configurations you can have in place, I can tell you from real world experience why the limits exist. In addition to the switch handling its port/data switching duties, having it copy data on an existing port/vlan to another port/vlan is adding additional overhead to the switch meaning additional work for the switch cpu and additional memory that is tied up, albeit temporarily, while the data is being copied from the source to the destination. Depending on the amount of traffic that is present on one or more of the ports involved in the port spanning configuration, you can run into one or both of the following problems – 1) Traffic destined for one or more of the span ports may get dropped and/or 2) Traffic for one or more of the other ports not involved in the spanning configuration may experience traffic drops. One way that you can see this first hand is to setup your switch for syslog and it will start complaining when it gets over loaded and starts dropping traffic.
As to the second part of your question about only spanning traffic based on a particular ip address. Within Cisco IOS, you can span traffic based on specific vlan’s. You can also direct the traffic to be spanned to other vlan’s. If you want the traffic to end up on another switch, you can use a remote vlan option that will help accomplish that task. To be able to span traffic based on ip address, ports used or something otherwise requiring deep packet inspection will require an appliance such as NetOptic’s Director product line. This solution can be the best way to in a network traffic intensive applications as you wont be placing even more of a load on a switch that may already be handling as much traffic as can be expected. For more information about this particular item, you can go to https://bit.ly/75kVz.
Cisco port Spanning restrictions
Why Cisco has restriction in number of spanning sessions? Is there any other solution available to have unlimited spanning seesions for both Tx/Rx?
Also , is there any solution which does the spanning based on source or destination based ip address? for e.g. if the source ip address is 1.1.1.1 throw the traffic to destination port 1. if source ip address is 2.2.2.2 put the throw to destination port 2.
Confused with which Cisco certification to do
Hi i am working as network engineer in a company for last 5 years I am unable to get job in a larger firm. I would like to increase my pay but havent been able to since I don have any specialization in the networking area. I have my Bachelors degree and have a Diploma in Computer Hardware & Networking from Jetking (India). I wanted to do cisco Certification but can’t understand which one to do. Some says doing CCNA is good. Others say the Cisco certs expire in 3 years, then you have to reappear for the exam. Please help me out.
i want solution
Hello, i have the same problem with a fresh installation of windows server 2008 enterprise (32 bit). If i try to open server manager i have these:
Description:
Stopped working
Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: mmc.exe
Problem Signature 02: 6.0.6001.17051
Problem Signature 03: 47452dd0
Problem Signature 04: Microsoft.Windows.ServerManager
Problem Signature 05: 6.0.0.0
Problem Signature 06: 474547fe
Problem Signature 07: 1ca1
Problem Signature 08: 3a
Problem Signature 09: System.NullReferenceException
OS Version: 6.0.6001.2.1.0.0.1
Locale ID: 1040
Web-based application running slow and with errors
I work in a company with multiple locations, I’m at hdq. Two of our locations are using a data-intensive web-based application, and they complain about slow response at peak hours. This is part one of the issue. Part two is that there is a “page execution error” message that seems somewhat related to the slowness, in that it shows more often during the slower times; it also looks like a customized message (“a message has been sent to your administrator”). I’ve had a very hard time reaching the vendor for this application and actually getting them to troubleshoot the issue.
First, we were told that everything points to the maxing of our 10 Mbps Internet access at certain times; we had our ISP allow for up to 45 and we’re nowhere near that at any given time. Our network monitoring tool does not list the utilization for the routers at these two offices at a high percentage at any point; additionally, nobody at either of these two locations is complains about slow response on anything else (e-mail, Internet, internal applications). Then, the vendor suggested adding the url to trusted websites in IE6, then also upgrading to IE8, having the latest Java, cleaning cookies… none of these steps seemed to make a difference. Then they started pointing to hardware issues: not enough memory, it’s the computer that’s slow. When asked what the requirements were, they referred to 1 Gb of RAM minimum, 2 Gb of RAM optimal – which some PCs have, some don’t, but there’s no difference in how the users working on those devices run this application.
I just summarized about two and a half months of work here. Latest suggestion is to install a network optimization tool (Silver Peak) to address the slowness issue – which now they also say will fix the error message issue. My opinion is that everything points to a backend database that just doesn’t allow for all the traffic – but I’m not a db admin. What do you think? Any suggestions? Any information I can provide to further clarify this? Thank you in advance.
Jobs for someone with a CCNA ?
Can anyone tell me about what types of jobs a candidate with ccna certificate can expect to be able to get ?
Convert a app from the year 1999 to run under Windows 7 x64 mode
I have an app that I can run under Windows 7 x86. However, I need to run it on a Windows 7 x64 machine. The x86 install run XP prior to install Win 7 x86. The x64 is a new dual core laptop.
Are there any good appications that will backport the setup to run under X64.
thanks