Lucent Technologies 6000 - Manual (Page 515)

AppleTalk Routing
Introduction to AppleTalk routing
MAX 6000/3000 Network Configuration Guide 13-3
An extended network is a group of nonextended networks on the same physical data link, and
contains a range of network numbers. Each network in the range supports up to 253 devices.
EtherTalk and Teutonically are examples of extended networks.
At least one router on a network, called the seed router, must have the network-number range
specified in its port description. Other routers on the network can have a network range of 0
(zero), which specifies that they acquire the network-number range from Routing Table
Maintenance Protocol (RTMP) packets sent by the seed router. AppleTalk routers on a network
must not have conflicting network-number ranges for that network. A zero value does not
cause a conflict, but otherwise, all seed routers on the same network must have the same value
for the start and end of the network-number range.
Figure 13-1 shows a network with three routers and three zones configured. Each zone has a
range of network numbers.
Figure 13-1. AppleTalk LAN
Router X, Router Y, and Router Z connect to the backbone network (Range 1001-1010). Each
router has an additional connection to a local network segment. For example, Router X has a
connection to the network range 100-109. User A’s computer also connects to the 100-109
range.
Because Router X is configured with only one zone, any AppleTalk device joining the segment
belongs to the SALES zone. But User B’s computer can belong to either the SALES zone or
the MKTG. zone. Some AppleTalk devices allow you to select the zone to which they belong.
If there is no way to manually assign the zone, the AppleTalk device is put into the default
zone, which is defined on the AppleTalk router.
Figure 13-1 shows two important concepts about network numbers and zones. When a network
range is defined, all values within that range are unusable for any other segment. The segment
to which User C’s computer connects uses network range 300-309. No other network segment
in this AppleTalk network can use network numbers 300, 301, 302, and so on in their ranges.
As an example, network number 310 is available to a new network segment
Zones can be shared among network segments. In Figure 13-1, network 100-109 supports zone
SALES. So does network 300-309.
Network Range:
1001-1010
Zone: SALES
Network Range:
200-209
Zone: MKTG.
Network Range:
300-309
Zone: SALES, MKTG.
Network Range:
100-109
Zone: SALES.
Router X
Router Y
Router Z C B
A