AutoTracker VLANs
Page 22-8
12345678
123456
VLAN
3
Network 3
Group 2
VLAN
2
Network 2
Device B
Network 3
MAC
address =
B
Device A
Network 2
MAC
address =
A
Interface for
Network 2
MAC
address =
X
Interface for
Network 3
MAC
address =
Y
➋
➍
Let’s say that the next transmission is a
RIP
update from the router interface for network 3.
The source of the
RIP
update is Network 3,
MAC
address Y. AutoTracker thus assigns
MAC
address Y to
VLAN
3.
MAC
address Y is now assigned to both
VLAN
2 and
VLAN
3.
The same situation can occur with
MAC
address X on the router interface for network 2.
Both router interfaces will be members of both
VLAN
s and will transmit
RIP
updates to both.
If this is an
IPX
network and
IPX
servers are members of these
VLAN
s, they will respond
with router configuration errors. If this is an
IP
network and devices A and B are
IP
workstations listening to
RIP
, they will respond with invalid network address errors.
(internal or external)
Router
➌
The switch receives the frame from Net-
work 2,
MAC
address Y, forwards it to
its destination, Device B, and gives it to
AutoTracker to be learned.
Per the policies, AutoTracker assigns the
frame’s source
MAC, MAC
address Y, to
VLAN
2. The router interface for net-
work 3 is now a member of network 2!
Omni Switch/Router
The router receives the frame on the interface for Network 2 and
routes the frame to the interface for Network 3. To do this, the router
strips the
MAC
header from the frame and inserts the
MAC
address of
from Network 2,
MAC
address A
Frame
➊
Device A initiates a request to
route a frame to Device B. The
switch forwards the frame to the
router interface for Network 2.
How Routed Frames can Confuse
VLAN Assignment
Frame
from Network 2,
MAC
address Y
from Network 2,
MAC
address Y
Frame
its interface for Network 3. The
frame now specifies its source
as Network 2,
MAC
address Y.
Please Note
T h i s e x a m p l e a s s u m e s t h a t
AutoTracker has not yet learned
the
MAC
addresses of the router
interfaces for Networks 2 and 3.
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 ...