3Com 3CR990SVR97, 3CR990-TX-97, 3CR990-TX-95, 3CR990SVR95 manual Number of VLANs

62CHAPTER 4: INSTALLING DYNAMICACCESS SOFTWARE IN WINDOWS

Checksum, TCP Segmentation, and IP Sec). In this case, the offload support is limited to the features supported by all NICs in the group. For example, if two NICs in a group support all offload features but one NIC supports only TCP Checksum, then offload support for the group is limited to TCP Checksum.

■Observe these VLAN configuration guidelines:

■Assign a VLAN ID number to each VLAN. If you are not using a DHCP server, each VLAN that is using IP services requires an IP address and subnet mask.

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DynamicAccess software supports as many as 16 VLANs per server.

Each VLAN bound to TCP/IP must exist on a separate IP subnet. DHCP servers used to allocate IP addresses must be located on the same IP subnets as the VLANs.

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Each VLAN bound to the IPX/SPX protocol must use a unique network number.

To avoid problems associated with blocked multicast streams, configure end stations that support the IEEE 802.1p GARP Multicast Registration Protocol specification (GMRP) on separate switch segments from stations that do not support it.

■Under Windows 2000, when VLANs are enabled, the Windows 2000 802.1p Support property must be disabled for all the underlying miniports.

■The following memory requirements are for multiple VLAN configurations. You can improve overall system performance with VLANs by increasing

the physical RAM, the virtual memory page size, or both.

Number of VLANs	Minimum RAM Size (MB)
up to 16	128