Q on the frames jumbo and implementation of vlan separate

Why do you recommend to set aside a VLAN for data frames between the hosts ISCSI and EQ?

There is another reason to avoid the defaul VLAN: with switches Cisco VLAN 1 only supports the standard frames (1500 bytes).  Since this is the default VLAN, Cisco will attempt to deliver all packages, including jumbo frames.  When the switch is busy, larger packages can be filed (leading to inconsistent behavior with jumbo frames).  Will we apply the MTU set for other VLANs (correct behavior will pass every time frames, or none of the time).

This inconsistency of chassis can be difficult to resolve - I had two W2K3 servers connected to my San.  The two servers to discover them, connect and their volumes of partition, but we'd always unplug when I am gone for formatting (the other worked).  The job server connected via standard frames so that the problematic one connected to 9000 bytes.  Solved the problem by setting the NIC in the server to standard frames immediately (additional tests with a VLAN different show that the two servers could work properly with jumbo frames).

I've been able to reproduce these results with a PowerConnect switch and include many Cisco providers follow regarding this problem.

Tags: Dell Products

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