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STACK-LINK
TX
MANAGEMENT
PWR
DIAG
1
2
CRF with
Token-Ring
ports in SRT or SRB mode
Figure 7. Source Route Bridging (SRB) Mode
Redundant Connections to Fast Ethernet Network
A connection to the Ethernet cloud can be made using several Fast Ethernet ports
from multiple switches. Fast Ethernet ports connected from one switch to the same
Ethernet cloud should be grouped into one common CRF with an assigned LAN
segment number. From each switch, one CRF can be connected to the same
Ethernet cloud.
Redundant connections between source-routed and transparent networks may
cause ARE frame duplication and infinite ARE frame loops as a result of discarding
source routing information during translation from Token-Ring to Ethernet format.
There are, however, solutions to both problems:
•
Infinite frame loops are eliminated by using a common LAN segment number
for the entire Ethernet cloud or by proper Spanning Tree configuration. The
recommended CRF number is 4095.
•
Frame duplication is eliminated by a proper STP configuration allowing only
one link between the Token-Ring cloud and the Ethernet to be forwarding.
See the next section "Network Scenarios—Preventing Frame Duplication and
Looping" on page 26 for details.
CrossFire 8730 Switch Reference Guide, DOC-7047 v. 1.1
CrossFire 8730
ACT
ACT
STATUS
100
100
STATUS
FAULT
LINK
LINK
FAULT
RX
ATTACH
21-22
21
22
FAST ETHERNET
25-26
25
ERR
RST
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Token-Ring
cloud
Ethernet cloud
All translational links grouped
into one CRF (SRB mode). If
more than one link is used, IEEE
STP must be enabled.
Fast Ethernet Translation Switch
ACT
ACT
100
100
LINK
LINK
26
BRF with IEEE STP enabled
17
18
19
20
SR Bridge
CRF with
Token-Ring
ports in SRT or SRB mode
Token-Ring
cloud
Switch Overview
25
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