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CrossLink
A CrossLink Token-Ring connection is used to improve interswitch bandwidth. A
CrossLink is used to connect two switches with two to eight Token-Ring links. A
CrossLink provides bandwidth of from 32 to 128 Mbps in half-duplex mode, or
from 64 to 256 Mbps in full-duplex mode.
STACK-LINK
STATUS
FAULT
TX
RX
ATTACH
21-22
MANAGEMENT
PWR
DIAG
ERR
RST
1
2
3
4
5
6
Figure 16. Setting up CrossLinks for Token-Ring Ports
The CrossLink feature affects other switch features in the following ways:
•
Half-duplex and full-duplex. A single CrossLink can include a combination of
half-duplex and full-duplex connections—for example, a CrossLink
containing three Token-Ring ports can have two full-duplex and one half-
duplex connections. However, each pair of interconnected Token-Ring ports
must both be either half-duplex or full-duplex.
•
Statistics reporting. Statistics for the CrossLink are displayed for individual
Token-Ring ports, not for the CrossLink as a whole. Station addresses are
distributed among the Token-Ring ports in the CrossLink. See Chapter 4,
"Monitoring the Network from the Statistics Menu".
•
Address filtering. Address filters are automatically added to every Token-Ring
port in a CrossLink.
The lowest numbered Token-Ring port of the CrossLink is called the primary port.
CrossLink software learns addresses differently than regular ports, as follows:
•
New source address. When a packet arrives at a CrossLink port with an
unknown source address, the system module creates an entry in the master
table and the port table for the CrossLink. The system module assigns the
primary port in the CrossLink as the location of the address.
CrossFire 8730 Switch Reference Guide, DOC-7047 v. 1.1
STACK-LINK
STATUS
FAULT
21-22
21
TX
RX
ATTACH
MANAGEMENT
PWR
DIAG
ERR
RST
1
2
3
4
5
6
7
8
CrossFire 8730
ACT
ACT
STATUS
100
100
LINK
LINK
FAULT
21
22
FAST ETHERNET
25-26
7
8
9
10
11
12
13
14
15
16
CrossFire 8730
Fast Ethernet Translation Switch
ACT
ACT
ACT
STATUS
100
100
100
LINK
LINK
LINK
FAULT
22
25-26
25
FAST ETHERNET
9
10
11
12
13
14
15
16
17
18
STACK-LINK
STATUS
FAULT
TX
RX
ATTACH
21-22
MANAGEMENT
PWR
DIAG
ERR
RST
1
2
3
4
5
6
7
Fast Ethernet Translation Switch
ACT
ACT
100
100
LINK
LINK
25
26
17
18
19
20
ACT
100
LINK
26
19
20
CrossFire 8730
Fast Ethernet Translation Switch
ACT
ACT
100
100
STATUS
LINK
LINK
FAULT
21
22
FAST ETHERNET
25-26
25
8
9
10
11
12
13
14
15
16
Switch Configuration
97
ACT
ACT
100
100
LINK
LINK
26
17
18
19
20
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