How an Ethernet switch creates a collision domain on each port?
Hi ,
How an Ethernet switch creates a collision domain on each port?
Thanks
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A switch port running in half duplex is basically the same as any other two hosts running half duplex between them. When either host transmits, each has a chance to collide with a transmission from the other host.
As frames between switch ports are buffered, hosts on two different ports, even if they transmit at the same time, won't directly collide. Again, though, if port is running half duplex, host can collide with switch port retransmitting the other host's traffic. I.e. two hosts, on two different ports, behave (practically) as if they were directly connected. The advantage of a switch, however, is another two hosts transmitting to each other won't collide between the two pairs, as they would on a hub. I.e. on a hub A<>B frames may collide with C<>D frames, but they shouldn't on a switch.
If host ports are running in full duplex, there should be no collisions at all (which would also be true with a pair of hosts on a full duplex wire between them).
NB: above is just for unicast when switch "knows" destination MAC's port.
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Collision Domain , Vlan Tagging.
Hi,
Can any one tell me please do we have collisions in a Switch if yes 1. how to avoid Collisions in a switch and 2. Define Vlan Tagging. Can anyone please answer my two questions.
Thanks.Hi,
1) each port on a switch is a collision domain this is called microsegmentation and you can run full-duplex so the answer is No there are no more collisions in a switched network. apart from shared segment where there is a hub or AP attached
2)on links where multiple VLANS can travel you must have a way of differentiating the VLAN the frame is part of and so you have a field with the VLAN id which is a Tag permitting to recognize the VLAN so the switch knows on which port it can forward the frame when the tag is removed.So a frame enters a port belonging to a particuliar vlan and it is tagged with the vlan id when traversing the trunk( or tagged port) and untagged when forwarded to the destination.
In 802.1Q ther is also the concept of native vlan : frames from this vlan will have no tag, this is a compatibility feature for devices not VLAN aware.
Regards.
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How to create a new domain in BPEL console
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Am new to BPEL can some one let me know how to create domain in BPEL console
Thanks
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1 - You go to the BPEL Admin page:
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Failed while creating virtual Ethernet switch. Failed to connect Ethernet switch port
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So as far as I know everything is peachy untill the error below. Dead stop now
Error (12700)
VMM cannot complete the host operation on the 08-NY-VHOST01.accounts.ccac-ont.ca server because of the error: Failed while creating virtual Ethernet switch.
Failed to connect Ethernet switch port (switch name = '******', port name = '88C16766-ED02-4AC0-8CD7-660AC9D424DD', adapter GUID = '{FAF431D8-0124-4E40-BB3B-9234BAA02973}'): The system cannot find the file specified. (0x80070002).
Unknown error (0x800b)
Thank you for your time
Christopher
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Macs: iTunes Store- About authorization and deauthorization.
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I have a gigabit Airport Extreme router. I like using the Airport Utility to control my network. I want to convert a large number of wireless connections to wired ethernet devices, about 24. The reason is that I just get too many wireless dropouts, and I need a more reliable network. I am looking for the best way to design this. It seems like adding a gigabit Ethernet switch is the easiset and best way to accomplish this. My questions are:
1. How large of a gigabit switch can you add to the LAN port of an Airport Extreme: 24-port, 48-port?
2. How far down can you cascade switches? In other words, can I connect three 5-port switches (level 1 switches) to the three LAN ports on the Airport Extreme, and then connect more 5-port switches to the level 1 switches?
3. What are the performance implications for either design. Can you achieve gigabit performance with these designs?
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Hi,
I would like to create a WLI domain with three servers:<br>
Ø One for the administration console;<br>
Ø One for WLI;<br>
Ø And the last to deploy EJB Session (which are the service called by WLI)<br><br>
To create the domain, I use the WLI 8.1 SP4 Configuration Wizard.<br><br>
After creating the domain with 3 services, I have not succeeded to start the WLI Server.<br><br>
For another test, I would like to create a WLI domain with two servers:<br>
Ø One for the administration console and WLI;<br>
Ø And the last to deploy EJB Session<br><br>
To create the main server, I have used the configuration wizard. For the other, I have used the console administration. With this configuration, the message brocker was not initialised.<br><br>
For the last test, I have created a domain with single server and I had no errors.<br><br>
<b>So, my question is: What is the method to create a domain with three servers?</b><br><br>
Thanks for your help<br> <br><br><br>
<b>Case 1: Test to define 3 servers</b>
<4 nov. 2005 14 h 45 CET> <Notice> <WebLogicServer> <BEA-000328> <Starting WebLogic Managed Server "etsoWLI" for domain "complexDomain">
The WebLogic Server did not start up properly.
weblogic.management.AbortDeploymentException: weblogic.t3.srvr.FatalStartupException: Can't start server due to startup class failure WLI Startup Class - with nested exception:
[com.bea.wli.management.BPMComponentInitializationException: Failed to initialize ProcessConfiguration module]
at weblogic.t3.srvr.StartupClassService.addDeployment(StartupClassService.java:92)
at weblogic.management.mbeans.custom.DeploymentTarget.addDeployment(DeploymentTarget.java:337)
at weblogic.management.mbeans.custom.DeploymentTarget.addDeployments(DeploymentTarget.java:597)
at weblogic.management.mbeans.custom.DeploymentTarget.updateServerDeployments(DeploymentTarget.java:575)
at weblogic.management.mbeans.custom.DeploymentTarget.updateDeployments(DeploymentTarget.java:241)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at weblogic.management.internal.DynamicMBeanImpl.invokeLocally(DynamicMBeanImpl.java:754)
at weblogic.management.internal.DynamicMBeanImpl.invoke(DynamicMBeanImpl.java:733)
at weblogic.management.internal.ConfigurationMBeanImpl.invoke(ConfigurationMBeanImpl.java:509)
at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1560)
at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1528)
at weblogic.management.internal.RemoteMBeanServerImpl.private_invoke(RemoteMBeanServerImpl.java:988)
at weblogic.management.internal.RemoteMBeanServerImpl.invoke(RemoteMBeanServerImpl.java:946)
at weblogic.management.internal.MBeanProxy.invoke(MBeanProxy.java:954)
at weblogic.management.internal.MBeanProxy.invokeForCachingStub(MBeanProxy.java:481)
at weblogic.management.configuration.ServerMBean_Stub.updateDeployments(ServerMBean_Stub.java:7691)
at weblogic.management.deploy.slave.SlaveDeployer.updateServerDeployments(SlaveDeployer.java:1304)
at weblogic.management.deploy.slave.SlaveDeployer.resume(SlaveDeployer.java:347)
at weblogic.management.deploy.DeploymentManagerServerLifeCycleImpl.resume(DeploymentManagerServerLifeCycleImpl.java:229)
at weblogic.t3.srvr.SubsystemManager.resume(SubsystemManager.java:131)
at weblogic.t3.srvr.T3Srvr.resume(T3Srvr.java:966)
at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:361)
at weblogic.Server.main(Server.java:32)
Reason: [Deployer:149601]The deployment framework was unable to resume accepting requests.weblogic.t3.srvr.FatalStartupException: Can't start server due to startup class failure WLI Startup Class - with nested exception:
[com.bea.wli.management.BPMComponentInitializationException: Failed to initialize ProcessConfiguration module]
<4 nov. 2005 14 h 45 CET> <Emergency> <WebLogicServer> <BEA-000342> <Unable to initialize the server: [Deployer:149601]The deployment framework was unable to resume accepting requests.weblogic.t3.srvr.FatalStartupException: Can't start server due to startup class failure WLI Startup Class - with nested exception:
[com.bea.wli.management.BPMComponentInitializationException: Failed to initialize ProcessConfiguration module]>
<br> <br>
<b>Case 2 : Test to define 2 servers</b><br>
<4 nov. 2005 15 h 03 CET> <Error> <WLI-Core> <BEA-484037> <Process Tracking failed to initialize properly. Tracking data cannot be recorded for process typ
e "/MailProcess/processes/process02.jpd".>
<4 nov. 2005 15 h 03 CET> <Error> <WLI-Core> <BEA-481000> <The Message Broker is not initialized>
<4 nov. 2005 15 h 03 CET> <Error> <WLW> <000000> <Failed to register subscriptions for JPD /MailProcess/processes/process02.jpd
java.lang.RuntimeException: The Message Broker is not initialized
at com.bea.wli.broker.MessageBroker.getMessageBroker(MessageBroker.java:277)
at com.bea.wli.control.MBUtils.registerSubscriptionRules(MBUtils.java:99)
at com.bea.wli.bpm.runtime.JpdDispFile$3.run(JpdDispFile.java:903)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at com.bea.wli.bpm.runtime.JpdDispFile.registerSubscriptions(JpdDispFile.java:912)
at com.bea.wli.bpm.runtime.JpdDispFile.<init>(JpdDispFile.java:212)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
at com.bea.wlw.runtime.core.dispatcher.DispUnit.loadDispFile(DispUnit.java:219)
at com.bea.wlw.runtime.core.dispatcher.DispUnit.<init>(DispUnit.java:153)
at com.bea.wlw.runtime.core.dispatcher.DispCache.ensureDispUnit(DispCache.java:578)
at com.bea.wlw.runtime.core.dispatcher.HttpServerHelper.getDispUnit(HttpServerHelper.java:501)
at com.bea.wlw.runtime.core.dispatcher.HttpServerHelper.executeGetRequest(HttpServerHelper.java:541)
at com.bea.wlw.runtime.core.dispatcher.HttpServer.doGet(HttpServer.java:81)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1006)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6718)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3764)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2644)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
>
javax.management.InstanceNotFoundException: lastEtsoDomain:Location=etsoMain,Name=MsgBroker,Type=MsgBrokerRuntime (admin server:true)
at weblogic.management.internal.MBeanHomeImpl.getMBean_helper(MBeanHomeImpl.java:145)
at weblogic.management.internal.MBeanHomeImpl.getMBean(MBeanHomeImpl.java:130)
at weblogic.management.internal.MBeanHomeImpl.getRuntimeMBean(MBeanHomeImpl.java:557)
at weblogic.management.internal.MBeanHomeImpl.getRuntimeMBean(MBeanHomeImpl.java:549)
at weblogic.management.internal.AdminMBeanHomeImpl.getRuntimeMBean(AdminMBeanHomeImpl.java:580)
at com.bea.wli.management.MBeanHelper.getMsgBrokerRuntimeMBean(MBeanHelper.java:549)
at com.bea.wli.bpm.runtime.__broker.listSubscriptions(__broker.java:178)
at com.bea.wli.bpm.runtime.__broker._jspService(__broker.java:833)
at com.bea.wlw.runtime.core.dispatcher.ServiceView.dispatchToPage(ServiceView.java:269)
at com.bea.wlw.runtime.core.dispatcher.ServiceView.forward(ServiceView.java:438)
at com.bea.wlw.runtime.core.dispatcher.HttpServerHelper.executeGetRequest(HttpServerHelper.java:617)
at com.bea.wlw.runtime.core.dispatcher.HttpServer.doGet(HttpServer.java:81)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1006)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6718)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3764)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2644)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)To use 3 managed servers with Weblogic, I must a cluster environment.
Weblogic say: "WebLogic Integration domain that includes an administrative server and one or more managed servers must include a cluster. A WebLogic Integration domain that includes an administrative server and one or more managed servers without a cluster is an unsupported configuration."
Fred -
How do i create a new domain?
Is there an easy way to create new domains for WL Server 6.0? There
doesn't seem to be any tool that allows me to do this. Does that mean
my only option is to copy files from another domain?
Thanks for any help,
Randy Strobel
Systems Analyst
Synergy, Inc.
[email protected]Here are a couple of points to pay attention to in addition to the doc
pointed by Kumar:
1. you MUST copy fileRealm.properties initially when you create a new domain
in the domain subdirectory under config in bea.home.
2. Initial password for the starting servers ( admin or managed) will be
same as default system password ( system password for the domain from where
the SerializedSystemIni.dat and fileRealm.propeerties were copied. You can
start the new domain's admin server and change the syetm password. Next time
you will start admin server or managed server in new domain, you will be
using the new password.
3. If you change the system password through console, and you were using
password.ini, you must change the password in password.ini file also. If you
specified the password in startup script, you must manually change it to new
password. If you were not specifying the password in password.ini or in the
startup script as -D property, then as always, you will be prompted for
password, and you can specify the new password.
Viresh Garg
Principal Developer Relations Engineer
BEA Systems
Kumar Allamraju wrote:
http://e-docs.bea.com/wls/docs60/adminguide/config.html#1025484
Randy Strobel wrote:
Is there an easy way to create new domains for WL Server 6.0? There
doesn't seem to be any tool that allows me to do this. Does that mean
my only option is to copy files from another domain?
Thanks for any help,
Randy Strobel
Systems Analyst
Synergy, Inc.
[email protected]
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