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Bridging
4-4 Bridging Basics
About Source Route-Transparent Bridges
Because network topologies have developed in which bridges must be able to
handle network trafÞc from end stations which support source routing and others
which do not, a hybrid type of bridgeÑSource Route-Transparent
(SRT)Ñcombines elements of both bridging methods.
An end stationÕs network drivers can be conÞgured in software to use a bit setting
in the source address portion of a data frame to indicate whether the station is to
operate in a Source Route or Transparently bridged network environment. The
Routing Information Indicator (RII) bit of the source address is set to 1 if the
station is to use Source Routing; if the station is to operate in a Transparently
bridged environment, the RII bit is left unchanged (i.e., at 0).
Not all end stations in a Token Ring environment have network drivers which
support Source RoutingÑwhether the drivers are improperly conÞgured via
management or they simply are not source-route capable.
In a network with a mix of Source Route and Transparent end stations, data
frames from both station types must be bridged correctly. An SRT bridge inspects
the RII bit setting of incoming frames to determine whether they should be
Transparently bridged (if the RII bit was at 0) or Source Routed (if the RII bit was
set to 1) to their destination and will use the appropriate bridge method to
forward the frame.
About Source Route-Translational Bridges
Because SmartSwitch 2000, 6000 and 9000 modules have the ability to combine
mixed network topologies, yet another hybrid bridge methodÑcalled a Source
Route Translational bridge (SR-TB)Ñis used by a number of these SmartSwitch
modules.
An SR-TB bridge supports both Source Routing and Transparent bridging
capabilities, with the added requirement of maintaining Source Route
information across an FDDI interfaceÑeither the SmartSwitch 9000 FNB
backplane, or an installed FDDI High Speed Interface Module (HSIM).
An SR-TB bridge does this by ÒtranslatingÓ the Token Ring physical frame format
(by stripping out routing information, if necessary) so that the frameÕs source
address can be recognized on an FDDI, Ethernet, or ATM segment; and then,
when data is returned to the source, restoring the necessary route information to
forward it along a bridged Token Ring environment.
NOTE
Cabletron has extended the functionality of Ethernet ports on translational bridges, so the
ports can be set to Source Route mode.
When an Ethernet port is in Source Route mode, on receipt of an SR packet from a Token
Ring port, it will save the Source Routing information and send out the packet
transparently. When the response comes back, the source routing information will be
restored and sent to the Token Ring port.
- CSX200 and CSX400 1
- User’s Guide 1
- Virus Disclaimer 3
- Restricted Rights Notice 5
- Chapter 4 Bridging 8
- Contents 10
- Introduction 11
- HSIM-W6 and HSIM-W84 12
- Related Manuals 13
- Software Conventions 14
- Using the Mouse 15
- Using Window Buttons 16
- Getting Help 17
- CSX200 and CSX400 Firmware 18
- CSX200 and 400 Chassis View 19
- Viewing Chassis Information 20
- Front Panel Information 21
- Menu Structure 22
- The Chassis Manager Window 27
- Viewing Hardware Types 28
- Managing the Device 29
- 2-12 Managing the Device 30
- Managing the Device 2-13 31
- 2-14 Managing the Device 32
- Managing the Device 2-15 33
- 2-16 Managing the Device 34
- Managing the Device 2-17 35
- (Received only) 35
- (Received only) 35
- (Transmit only) 35
- Enabling and Disabling Ports 36
- Managing the Device 2-19 37
- 2-20 Managing the Device 38
- WAN Configuration 39
- About the CSX400 40
- CSX WPIMs 41
- 3-4 CSX WPIMs 42
- WAN Logical View 43
- Changing WAN Logical Settings 44
- WAN Logical View 3-7 45
- 3-8 WAN Logical View 46
- About Transparent Bridging 48
- About Source Route Bridging 48
- Bridging Basics 4-3 49
- 4-4 Bridging Basics 50
- Bridging Basics 4-5 51
- The Bridge Status Window 54
- The Bridge Status Window 4-9 55
- 4-10 The Bridge Status Window 56
- The Bridge Status Window 4-11 57
- 4-12 The Bridge Status Window 58
- The Bridge Status Window 4-13 59
- Bridge Statistics 61
- 4-16 Bridge Statistics 62
- Bridge Statistics 4-17 63
- 4-18 Bridge Statistics 64
- Bridge Statistics 4-19 65
- 4-20 Bridge Statistics 66
- Bridge Statistics 4-21 67
- 4-22 Bridge Statistics 68
- The CSMACD Statistics Window 69
- 4-24 Bridge Statistics 70
- Bridge Statistics 4-25 71
- 4-26 Bridge Statistics 72
- Bridge Statistics 4-27 73
- 4-28 Bridge Statistics 74
- Bridge Statistics 4-29 75
- 4-30 Bridge Statistics 76
- Bridge Statistics 4-31 77
- Source Route Statistics 78
- Bridge Statistics 4-33 79
- 4-34 Bridge Statistics 80
- Bridge Spanning Tree 81
- Bridge Level Fields 82
- Bridge Spanning Tree 4-37 83
- Bridge Port Level Fields 84
- Bridge Spanning Tree 4-39 85
- 4-40 Bridge Spanning Tree 86
- Bridge Spanning Tree 4-41 87
- Filtering Database 88
- Filtering Database 4-43 89
- 4-44 Filtering Database 90
- Filtering Database 4-45 91
- 4-46 Filtering Database 92
- Filtering Database 4-47 93
- 4-48 Filtering Database 94
- Bridging 100
- Changing the Receive Ports 101
- Source Route Configuration 103
- Information on Source Routing 104
- Making and Setting Changes 109
- Setting the Aging Time 111
- Duplex Modes 112
- The Duplex Modes Window 113
- 4-68 Duplex Modes 114
- Duplex Modes 4-69 115
- SONET Port Configuration 120
- SONET Port Configuration 4-75 121
- SONET/SDH Statistics Window 122
- 4-78 SONET Port Configuration 124
- SONET Port Configuration 4-79 125
- 4-80 SONET Port Configuration 126
- SONET Port Configuration 4-81 127
- Token Ring Bridge Mode 129
- Defining the Bridge Modes 130
- Defining the Bridge Method 136
- Setting the Bridge Method 137
- Configuring SmartTrunking 142
- Configuring SmartTrunking 4-97 143
- 4-98 Configuring SmartTrunking 144
- Configuring SmartTrunking 4-99 145
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