we've a new 4506 swicth in place. Servers are connected to it. Ports are configured as Auto. server shows the connection status as 1 gig. But the communication on 1 gig is very slow. When we change the connection to 100 mbps, the communication gets perfect.
we are using cat 6 cable for the connectivity. Tried all by manaul defining the speed to 1000 full duplex but never worked. Can anyone help on how can i acheive true 1 gig from this swicth.
What model of gigabit linecard are you using? Also, how densely populated are the ports with devices configured for 1000Mb?
Assuming you have most ports configured for 1000MB, and transmitting at that rate, you will certainly see sluggishness, as none of the gigabit copper linecards for the Cat4500 are fully non-blocking. Most are oversubscribed at a ratio of 8:1, meaning that each block of 8 ports shares 1Gb of bandwidth.
You can verify if you're running into this scenario by testing a device that is on its own block of 8 ports. If the bottleneck is caused by the oversubscription, then a single device on its own block of 8 should be able to get as much throughput as the NIC can handle. Generally, these are in contiguous blocks of 8, but some models may be different. Let me know which module you are dealing with, and I can confirm that for you.
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