. 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
Category: Support & Troubleshoot
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
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/
Layer 3 Switching
. The major difference between a router and an L3 switch is that packet switching in a router is done in software by microprocessor-based engines,
PowerConnect Switch Hang/Freeze – Management Interface unresponsive Troubleshooting
. 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
Infiniband Troubleshooting
This comes from a stack of notes i compiled when faced with issues on an infiniband deployment that needed troubleshooting. 1) InfiniBand Hardware Checks
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
Powerconnect SFP/Fiber connectivity – Options, Requirements and Troubleshooting
Basic requirements for fiber connections on PowerConnect switches: MMF optical cables, LC connectors, and SFP transceivers. 1) Optical Cables : Single Mode Vs Multi Mode Single Mode
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
Powerconnect Switches: Oversized Packet Counter, bcmRX task
. In a blade chassis implementation some time ago, some concerns were raised on the value of packet counters, and an inquiry on the bcmRX
Setting an Uplink VCP on a Standalone Switch – Juniper EX4200
You can set an uplink VCP on a standalone switch. You must set an uplink port on the standalone switch as a VCP prior to
Juniper Ex4200 Physical Interconnects
. EX4200 switches are available in models with 24 or 48 ports and with either all, or only 8 ports equipped for PoE. All EX4200
Juniper EX 4500 – Virtual Chassis & Interconnect
EX4500 switches ship with either the intraconnect module or the Virtual Chassis module preinstalled. Both modules are installed horizontally on the rear of chassis.
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
PowerConnect Switchport modes
. This post gives a comparison between the different port modes available on the Dell PowerConnect switches. the trunk and access modes are familiar to
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
Hasan Mansur 