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CRS-300 1:10 Redundancy Switch
Ethernet Network Configurations
3.3.6 Hub-to-Remotes, Split-path Traffic using Routers (Point-to-Multipoint)
Figure 3-10 shows hub-to-remotes configuration with standard and split-path Ethernet traffic, using
routers. A Static ARP Entry is needed in the switch so that routing of the Tx side of the modems
will be on the correct port of the router. For example, the Rx side of the Ethernet connection for
'Traffic Modem #N' comes in the bottom port of the Router, but the Tx Ethernet connection must
be connected through the same port as 'Traffic Modem #1', as shown in this figure.
A wired-thru Ethernet redundancy example is shown in Figure 3-11. When the CRS-300 1:10
Redundancy Switch backs-up a faulted Traffic Modem, the physical port on the router does not
change, because the Ethernet connection is properly rerouted within the CRS-300 from the
Traffic Modem to the Redundant Modem.
A wired-around Ethernet redundancy example is shown for the CDM-700 User in Figure 3-12.
When the CRS-300 1:10 Redundancy Switch backs-up a faulted Traffic Modem, the physical port
on the router needs to change from the Traffic Modem port to the Redundant Modem port.
Because of this, special router configuration is required for successful operation – the User may
need to consult with the router manufacturer.
The wired-around redundancy approach is not recommended.
IMPORTANT
Figure 3-10. Point-to-Multipoint using Routers
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Revision 16
MN/CRS300.IOM
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