Application Example 4 - Alcatel Omni Switch/Router User Manual

Application Example 4

Application Example 4
Routing in
IPX
How Routing Works Generally
AutoTracker "activates" a
assigned to the
and activates the
first port to the
policy. When such a frame is received, the source device – and the port to which that device
is connected – are assigned to the
Until a port is assigned to a
router port is inactive – even if routing was enabled by the user. Use of a
service is "on-demand" and AutoTracker does not enable routing until a port is present that
might require it. When AutoTracker assigns the first port to a particular
and its routing service (as long as routing was enabled by the user).
VLAN
Once AutoTracker has established devices'
routing services, it does not participate in the routing process. Routing works correctly
VLAN
as long as the policies of the
The Exception
There is one scenario in which AutoTracker affects the behavior of an
This situation occurs when an
policies
and IPX
arises in this situation because all ports in a Group are always members of that Group's default
#1 in addition to any other
VLAN
#1 is always active.
The figure on the facing page illustrates this problem situation. In this figure, three
within Group 2 – one of which is default
the presence of the internal
cies. When
IPX
assigned to
VLAN
2. When
IPX
assigned to
VLAN
3. However, ports 1 and 2 are also members of the Group's default
a member of
When Server A sends broadcasts, they are restricted to
IPX
address policies. When
because of the network address policies. However, when the internal
broadcasts on
in the Group are, by default, members of
configuration error because it is receiving broadcasts on
them on
VLAN
receiving broadcasts on
The Solution
The solution for this problem is to disable
when your network includes
routing is enabled, you should configure your network such that disabling
IPX
default
VLAN
Page 24-8
Networks
– and its internal router interface – when the first port is
VLAN
. If a has a port policy, AutoTracker assigns the specified port(s)
VLAN VLAN
immediately. If a
VLAN
when a frame is received from a source device that matches the
VLAN
VLAN
, that
VLAN
protocol were followed – with the exception below.
IPX
server is a member of any
IPX
routing is enabled on the Group's default
VLAN
router.
IPX
Server A is connected to the Omni Switch/Router on port 1, the Server is
2 (per the network address policy) and port 1 becomes a member of
Server B is connected to the Omni Switch/Router on port 2, the Server is
3 (per the network address policy) and port 2 becomes a member of
1 and 2 and port 2 is now a member of
VLAN VLAN
Server B sends broadcasts, they are restricted to
IPX
1 the broadcasts are flooded out all ports in the Group, because all ports
VLAN
2. Server B also responds with a router configuration error because it is
IPX
1 when it should only receive them on
VLAN
servers that are members of
IPX
#1 is not a problem.
has a logical policy, AutoTracker assigns the
VLAN
and the is activated.
VLAN
is maintained in an inactive state and its internal
VLAN
assignments and activated the appropriate
VLAN
VLAN
VLAN
s of which they are members. As a result, default
#1 – have routing enabled, as indicated by
VLAN IPX
s 2 and 3 both have
VLAN
VLAN
1. Server A responds to this with a router
VLAN IPX
VLAN
routing on default
IPX
IPX
VLAN
's routing
VLAN
, it activates that
VLAN
-routed network.
IPX
with network address
IPX
#1. An exception condition
VLAN
VLAN
network address poli-
IPX
#1, so port 1 is now
VLAN
1 and 3.
VLAN VLAN
2 because of the network
3, also
VLAN
router sends out
IPX
1 when it should only receive
3.
VLAN
#1. Because of this,
VLAN
network address
VLAN
routing on
IPX
's
s
VLAN
VLAN
s and