If you can get in do a show users and see if there are any sessions hung and if so clear them otherwise to clear this issue you will probably have to reload the switch to free up resources .
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Port 11 is setup as a trunk , change it to an access port in vlan 11 and set your DG as 3.254 on your client and retry your ping tests . Its not going to ping right if the port is set as a trunk .
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sounds like you do not have 4 good pairs of wires . You must have 4 good pairs in order for gigabit to run , whereas for 100 you only need 2 good pairs . And you are sure that the nics are gigabit nics in the pc's ?
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there isn't a "shutdown" line command in the "startup" config is there ? This would shut them down each time switch is rebooted . Check startup config .
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If you just trunked the vlan to the 4948 then a static route should not have been needed as the default gateway is on the 3750 . Any ip address on the 4948 would have been just to manage the switch and the ip default gateway command could have been used .
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If doing router on a stick and the 2800 is doing the routing then yes each subinterface needs an ip address on and all devices in that vlan would use that address as their default gateway off the subnet .
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Network connectivity is always going to be strange when you have devices within the same address range but they are using different subnet masks . This is a no no and will lead to unpredictable results .
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Unless you have spare box to test it on you don't really know. I have never seen the smaller boxes like you are stating take more than say 5-8 minutes to completely boot up . Even bigger boxes like the 6509's should not take more than say 12 minutes or so . You had something else going on if it took 30-40 minutes for the switch to be reachable again . If you have big stacks of 3750's say 8 switches in a stack then it will take somewhat longer .
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2950 does not have auto mdix so make sure if you are going other switches you use a crossover . if the connection to the isp is 100 meg set the port as auto , ISP not likely to have hardcoded the port and this will cause a duplex mismatch . If you have all your ports in the same vlAN then that should be functionally equivalent to a linksys switch without mdix capabilty . Unless you have a specific reason you shouldn't need any ports trunked .
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Read this for upgrade instructions and requirements. http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5500/sw/upgrade/708_N1_1/n5500_upgrade_downgrade_700.html
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