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ambiguous and depend on the VLAN to which the frame was sent. It would thus be
incomprehensible to equipment that does not understand VLAN tags.
Fast Ethernet Port Operation Modes
Each Fast Ethernet port may operate in one of the following modes:
•
Half-duplex
In this mode the port offers a 10 Mbps or 100 Mbps connection from the switch
to another switch, a workstation, or a hub.
•
Full-duplex
In this mode the port offers a 10 Mbps or 100 Mbps connection from the switch
to another switch or a workstation.
Fast Ethernet Bridging Modes
For general information on the bridging modes, see "Multiple Bridging Modes" on
page 17.
Source Route Switching (SRS)
SRS is the default mode of operation. This mode is also restored after a NVRAM
reset of the switch. In this mode, all Fast Ethernet ports are in the same CRF.
Frames are switched between ports based only on MAC addresses. In this mode,
the spanning tree algorithm is disabled by default. If more than one Fast Ethernet
port is used to connect to the Ethernet cloud, the IEEE Spanning Tree Protocol
should be enabled on the CRF.
Source Route Transparent (SRT)
Note : SRT is the suggested mode of operation.
If multiple CRFs are used on a switch, all Fast Ethernet links to the same Ethernet
cloud should be grouped into one CRF. If the spanning tree protocol is to be used,
enable the STP (spanning tree protocol) on the CRF and BRF. The CRF's STP
should be set to IEEE; the BRFs' STP should be set to Based on Bridging mode or
IEEE .
Note that this translational CRF is used only on the Token-Ring side and is used to
route source-routed Token-Ring frames toward the Ethernet cloud. See Figure 6.
CrossFire 8730 Switch Reference Guide, DOC-7047 v. 1.1
23
Switch Overview
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