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IGMP
● IGMP querying is disabled by default due to potential interoperability issues with core products that
do not follow the lowest IP address election method. Refer to Chapter 3 “Using Multicast Filtering” of
the Implementation Guide for more information about this method.
● If you wish to run multicast sessions in a network that does not contain any IGMP routers (or
queriers), you can configure the Switch to automatically negotiate with compatible devices on VLAN
1 to become the querier. Use the bridge multicastFilter igmp queryMode CLI command.
The Switch 4050/4060 is compatible with any device that conforms to the IGMP v2 protocol.
● If IGMP snooping is enabled then IP multicasts will only be forwarded within a VLAN if an IGMP
querier is present in that VLAN.
XRN Distributed Fabric
● If the XRN Interconnect breaks or is disconnected, all router interfaces in one of the units (including
the management interface if it was set manually) will go to the DOWN state. The interfaces will stay
down as long as the unit detects another unit with the same interfaces. Even if the management
interface is modified it will stay in the DOWN state. If the management interface was set by AutoIP,
then one unit will shut down all interfaces, but the management interface will acquire a new IP
address via the AutoIP process.
● To ensure maximum security after connecting units in a Distributed Fabric, and the units have
reconfigured themselves, 3Com recommends that you reconfigure the user names and passwords
defined in the local database using the Security > User web operation or the system management
password CLI command. This recommendation is not necessary if you are using a RADIUS
authentication server on your network to validate management access to the units.
● To provide support for XRN's Distributed Resilient Routing, XRN-enabled Switches send periodic
(once a second) ARP based broadcasts on the VLAN associated with the first non-default IP
interface defined on the fabric. This is typically, but not always, interface 3. This protocol will also
occur on a single Switch fabric as long as it has at least one non-default interface. These broadcasts
will not impact network performance.
Long Haul Fiber GBICs
● It is possible to enable pause mode flow control for Long Haul Fiber GBIC's using the Web interface
Physical Interface > Ethernet > Setup operation and changing the Default Full Duplex Flow control to
Enabled, or by using the CLI physical interface ethernet flowControl command and
entering on. However, pause flow control does not work correctly on Long Haul fiber due to packet
propagation delays over the long distances involved and therefore this form of flow control should
not be used.
WinSock 2 Libraries for Windows 95
Microsoft WinSock 2 is an application that helps other applications talk to other computers
and devices on networks and the Internet.
Microsoft Windows 98, Microsoft Windows NT 4 and Microsoft Windows 2000 already have
this application installed, so if you use these operating systems, you will not need to install
WinSock 2 on your machine.
If you use Windows 95, you may need to install this. Early versions of Windows 95 did not