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Core

This category contains 8 posts

Routed mVLT/eVLT – Dell Networking

VLT Proxy Gateway – Dell Networking

 

VLT, Peer Routing and Routed VLT – Dell Networking

Core Config Options: First Hop/Gateway Redundancy: VRRP: Same Switch hosts VRRP and STP Master-ship for deterministic forwarding @ L2/L3 and eliminate suboptimal forwarding path. In a non-VLT domain, only the Master owns VIP and actively forwards @ Layer 3, but in a VLT domain, both Master & backup actively forward traffic in the ”enhanced” VRRP. … Continue reading

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 and an over loaded condition occurs, the device will drop packets. Dropping packets is much more performance impacting than flow control. 802.3X flow … Continue reading

Force10 DCB Configuration – S4810 + MXL Sample / Example

. First, some background on DCB itself. DCB is an extension to Ethernet that enables the dedication of resources in the converged network. To ensure lossless delivery and latency-sensitive scheduling of storage, service traffic, and I/O convergence of LAN over a unified fabric, IEEE data centre bridging adds the following extensions to a classical Ethernet … Continue reading

Force10 S4810 VLT – Quick Configuration sample

. I have already given a non-technical synopsis on VLT in one of my previous posts here https://hasanmansur.com/2012/10/15/force10-s4810-stacking-vs-vlt/ As mentioned, VLT Is a Dual Active Control Plane implementation, of a Multi System LAG. Cisco vPC is a similar technology. VLT is beneficial in environments where the downstream devices like servers or access/distribution switches need to build … Continue reading

Force10 – Layer 2 Parameters – configuration ( VLANs, STP)

. I will start here with STP. As covered in one of my earlier posts, When configuring Spanning Tree on Force10 switches, you should accommodate whether your fabric is isolated, or inter-connects to other switches. The implications are as follows: On an isolated fabric or isolated switch segments, like the ones often used in iSCSI deployments, the … Continue reading

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. with this out of the way, the following are the different outputs and avenues that might shed further light … Continue reading