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18
Redundant Connections to Fast Ethernet Network
A connection to the Ethernet cloud can be made using several translational links
from multiple switches. Translational links 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.
Network Scenarios
Preventing Frame Duplication
The ARE duplication problem can occur only in a configuration with redundant
translational links in different switches (see Figure 6).
It is assumed that the network consists of a physically connected Ethernet cloud and
a physically connected Token Ring cloud. The two clouds are then connected by a
number of links that implement translational bridging.
Figure 6. Frame Duplication
SSIM-H2-02 Fast Ethernet - Translational Switch SmartStack Interface Module Installation and User Guide
Configuration
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