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CrossFire 8730 Switch Reference Guide, DOC-7047 v. 1.1 Switch Configuration
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.
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.
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STACK-LINK
ATTACH RX TX
DIAG PWR RST ERR MANAGEMENT
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FAST ETHERNET
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1
Fast Ethernet Translation Switch
CrossFire 8730
FAULT
STATUS
FAULT
STATUS
LINK
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ACT
LINK
100
ACT
LINK
100
ACT
LINK
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ACT
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STACK-LINK
ATTACH RX TX
DIAG PWR RST ERR MANAGEMENT
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FAST ETHERNET
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1
Fast Ethernet Translation Switch
CrossFire 8730
FAULT
STATUS
FAULT
STATUS
LINK
100
ACT
LINK
100
ACT
LINK
100
ACT
LINK
100
ACT
3 2 5 4 8 7 6 10 9 15 12 11 14 13 17 16 19 18 20
STACK-LINK
ATTACH RX TX
DIAG PWR RST ERR MANAGEMENT
21
FAST ETHERNET
21-22 25-26 22 26 25
1
Fast Ethernet Translation Switch
CrossFire 8730
FAULT
STATUS
FAULT
STATUS
LINK
100
ACT
LINK
100
ACT
LINK
100
ACT
LINK
100
ACT