AutoTracker VLANs
Page 22-15
Frame Flooding in AutoTracker VLANs
Flooding occurs when a frame is received addressed to a device that is unknown to the
switch or broadcast or multicast frames are received addressed to multiple users. In a typical
bridged environment, the frame would be forwarded out all ports. However, this is not true
with
VLAN
s as
VLAN
s segment the network into smaller broadcast domains. In this environ-
ment, flooding occurs as follows:
Unicast Traffic
• If the destination address of the frame is unknown buts its source address is known and
the source device is a member of one or more
VLANs
, the frame is flooded out all ports of
all
VLANs
in which the source device is a member. Please note the following:
–
If the source device is a member of multiple
VLANs
, some leakage may occur during
the flooding process. Leakage may occur only among
VLANs
in the same Group—
frames do not leak between Groups.
–
If the source device is a member of multiple
VLANs
and some or all of those
VLANs
share the same physical port, only one copy of the frame is forwarded out that port.
–
If the source device is a member of multiple
VLANs
that use trunking, only one copy
of the frame is sent to each trunk port.
• If both the source and destination addresses of the frame are unknown, the frame is
forwarded to the
MPX
for processing (to determine the
VLAN
or
VLANs
in which the origi-
nating device should be a member)
and
the frame is flooded out all ports of all
VLANs
in
which the source port is a member.
Broadcast and Multicast Traffic
Frames are forwarded out all ports that are members of the same
VLAN
s as the source
MAC
address. If the source
MAC
address is unknown, it is forwarded out all ports that have
VLAN
s
active on the source ports.
Routing Between AutoTracker VLANs
Devices that do not share membership in a common
VLAN
must use routers to communicate
with one another. You can configure a virtual router port that is capable of
IP
and/or
IPX
routing for each
VLAN
. By enabling a router port on a
VLAN
, you are creating a static route
entry within the switch to that
VLAN
. If this router port is not configured for a
VLAN
, then that
VLAN
will not be able to communicate with other
VLAN
s unless an external router is between
those
VLAN
s. You may configure up to 16 virtual router ports within a single Omni Switch/
Router. Each
VLAN
may contain only one router port.
Routing and the Default VLAN
. You can enable routing for the default
VLAN
when you initially
create a Group, or when you modify the Group. There are several issues about which you
should be aware when enabling routing on the Default
VLAN
. See
Application Example
4 in
Chapter 24, “AutoTracker VLAN Application Examples,” for more information.
Summary of Contents for Omni Switch/Router
Page 1: ...Part No 060166 10 Rev C March 2005 Omni Switch Router User Manual Release 4 5 www alcatel com ...
Page 4: ...page iv ...
Page 110: ...WAN Modules Page 3 40 ...
Page 156: ...UI Table Filtering Using Search and Filter Commands Page 4 46 ...
Page 164: ...Using ZMODEM Page 5 8 ...
Page 186: ...Displaying and Setting the Swap State Page 6 22 ...
Page 202: ...Creating a New File System Page 7 16 ...
Page 270: ...Displaying Secure Access Entries in the MPM Log Page 10 14 ...
Page 430: ...OmniChannel Page 15 16 ...
Page 496: ...Configuring Source Route to Transparent Bridging Page 17 48 ...
Page 542: ...Dissimilar LAN Switching Capabilities Page 18 46 ...
Page 646: ...Application Example DHCP Policies Page 20 30 ...
Page 660: ...GMAP Page 21 14 ...
Page 710: ...Viewing the Virtual Interface of Multicast VLANs Page 23 16 ...
Page 722: ...Application Example 5 Page 24 12 ...
Page 788: ...Viewing UDP Relay Statistics Page 26 24 ...
Page 872: ...The WAN Port Software Menu Page 28 46 ...
Page 960: ...Deleting a PPP Entity Page 30 22 ...
Page 978: ...Displaying Link Status Page 31 18 ...
Page 988: ...Displaying ISDN Configuration Entry Status Page 32 10 ...
Page 1024: ...Backup Services Commands Page 34 14 ...
Page 1062: ...Diagnostic Test Cable Schematics Page 36 24 ...
Page 1072: ...Configuring a Switch with an MPX Page A 10 ...
Page 1086: ...Page B 14 ...
Page 1100: ...Page I 14 Index ...