Figure 11. Spanning Tree Configuration - Olicom CrossFire 8730 Reference Manual

•
Secondary 2 – for a second backup connection to the Ethernet cloud. This
connection is always blocking if Primary or Secondary 1 are active.
Each CRF of Fast Ethernet ports connected to the same Ethernet cloud must have
a different connection attribute set. See Figure 11.
Primary CRF
FORWARDING
STACK-LINK
TX RX ATTACH
MANAGEMENT PWR DIAG ERR RST
1 2 3 4

Figure 11. Spanning Tree Configuration

The described spanning tree configuration results in exactly one forwarding link
between Ethernet and Token-Ring clouds, additional links becoming stand-by. For
customers migrating from Token-Ring to Ethernet it is recommended over time to
physically split the Token-Ring cloud into disjoint networks to increase bandwidth
between Token-Ring and Ethernet.
Figure 12. below illustrates a network with two physically disjointed Ethernet
clouds. Each switch in the configuration has one primary connection to one of the
two Ethernet clouds and one secondary connection to the other cloud.
This way redundancy for both Ethernet clouds is provided, while at the same time
the traffic load between the Token-Ring and Ethernet clouds is split between the
two switches.
CrossFire 8730 Switch Reference Guide, DOC-7047 v. 1.1
CrossFire 8730
Fast Ethernet Translation Switch
ACT ACT ACT ACT
STATUS 100 100 STATUS 100 100
FAULT LINK LINK FAULT LINK LINK
21-22 21 22 FAST ETHERNET 25-26 25 26
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Token-Ring
cloud
Ethernet cloud
STACK-LINK
STATUS
FAULT
TX RX ATTACH 21-22 21
MANAGEMENT PWR DIAG ERR RST
20
1 2 3 4 5 6 7 8
Token-Ring
cloud
SR Bridge
Secondary CRF
BLOCKING
CrossFire 8730
Fast Ethernet Translation Switch
ACT ACT ACT ACT
100 100 STATUS 100 100
LINK LINK FAULT LINK LINK
22 FAST ETHERNET 25-26 25 26
9 10 11 12 13 14 15 16 17 18 19 20
29
Switch Overview