Cabletron Systems TRMM-4, User Manual

Page: 23 / 74

INTRODUCTION
1-5
Figure 1-3 Sample Port/Station Assignments To The FNB Rings
(Configuration B)
Refer also to the TRMM-4 Local Management User’s Guide for details
on the execution of port assignment within an MMAC through the Local
Management application.
1.1.5 Segmenting The FNB For Additional Rings
FNB segmentation or “ring-wrapping” is another means of creating
additional Token Rings in the MMAC. In the MMAC, each Token Ring
MIM connects to adjacent MIMs, forming continuous FNB rings
extending from the first module in the hub to the last.
You can wrap the FNB interfaces of a single ring MIM
(e.g., the TRMIM-24A), breaking the backplane and segmenting the
FNB. For example, the FNB shown in
Figure 1-4 has been segmented
between the MMAC’s Slots 5 and 6. The resulting segmented portions of
the FNB remain fully functional, but they do not communicate with each
other. Thus, you can increase the number of Token Ring LANs operating
in the MMAC by segmenting the FNB.
S WITCHING UTP/STP
TOKEN RING
ERR
16 Mb
BYP MGMT
RING 4
16 Mb
16 Mb
16 Mb
16 Mb
16 Mb
RING 2
RING 1
RING 3
AUX 2
AUX 1
IN USE
22 DR
SN
IN USE
IN USE
IN USE
IN USE
IN USE
1
X
7
X
9
X
11
X
8
X
12
X
10
X
3
X
5
X
2
X
4
X
6
X
R
I
N
G
P
O
R
T
S
1
LINK PEN
LINK PEN
RI
RX
TX
RX
TX
RO
R
I
N
G
P
O
R
T
S
1
LINK PEN
LINK PEN
RI
RX
TX
RX
TX
RO
5
4
6
11
10
12
1
9
3
8
2
FNB Ring 2
FNB Ring 4
FNB Ring 1
FNB Ring 3
Configuration B
(Port 2 assigned to
FNB Ring 3, Port 9
assigned to FNB Ring 1)
7