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Channel: Hasan Mansur » Cisco
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Switch fabric setup for iSCSI

. This post summarizes various elements which, in my experience, serve to optimize the iSCSI switch fabric. While it talks about Powerconnect switches, the elements discussed would be relevant to any...

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Inter VLAN routing Troubleshooting

. The commands below are shown for a Juniper EX series model, but the troubleshooting is relevant for any platform. These are the requirements for the VLAN interface to be up/up: The VLAN must exist in...

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Latency, Packet loss Troubleshooting (PowerConnect, Others)

. First, know your network. know the topology. if you have a network in place where by design, the majority of the variables are deterministic & not left to chance, the task gets a lot simpler....

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Cisco and Force10 – STP Spanning Tree Interoperability

. Cisco Implements a proprietary flavor of spanning tree protocol, which is Per-VLAN in nature. This gives rise to certain considerations in a multi-vendor environment. Any third party switches that...

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PowerConnect Switch Hang/Freeze – Management Interface unresponsive...

. Are you connecting to the switch via the console port(and if so, are you using the null modem cable provided, or another solution), or is this a telnet/ssh connection that you’re establishing to...

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Switch Port auto shuts/ port shuts itself down – Troubleshooting

. Following is a list of vectors that may assist in troubleshooting issues where the port behavior look like it is shutting itself down. Cable/ Power Management. A link light does not guarantee that...

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Layer 2 Discards Troubleshooting – RX TX Discards

. The following list of questions/vectors can assist in troubleshooting Layer 2 discard issues. They have been of help to me in the past on more than one occasion. What Switches/Models? What firmware...

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Flow Control – Pause Frames

. When an Ethernet device gets over loaded, flow control allows it to send PAUSE requests to the  devices sending it data to allow the over loaded condition to clear.  If flow control is not enabled...

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