Page 2 - Transparent Bridging Features; Provides both bridging and routing of VLANs.; Integrated Routing and Bridging
Configuring Transparent Bridging Technology Overview BC-24 Cisco IOS Bridging and IBM Networking Configuration Guide Transparent Bridging Features Cisco’s transparent bridging software implementation has the following features: • Complies with the IEEE 802.1D standard. • Provides the ability to logi...
Page 3 - Switch packets from a bridged interface to a routed interface; Bridge-Group Virtual Interface
Configuring Transparent Bridging Technology Overview BC-25 Cisco IOS Bridging and IBM Networking Configuration Guide Integrated routing and bridging makes it possible to route a specific protocol between routed interfaces and bridge groups, or route a specific protocol between bridge groups. Local o...
Page 4 - Note
Configuring Transparent Bridging Technology Overview BC-26 Cisco IOS Bridging and IBM Networking Configuration Guide Figure 8 Bridge-Group Virtual Interface in the Router The bridge-group virtual interface is a normal routed interface that does not support bridging, but does represent its correspond...
Page 5 - Other Considerations; SRT Bridging Features; As with other media, all the features that use
Configuring Transparent Bridging Technology Overview BC-27 Cisco IOS Bridging and IBM Networking Configuration Guide FDDI-bridged interface. But for Internet Packet Exchange (IPX), Novell-ether encapsulation from the bridge-group virtual interface is translated to raw-token or raw-FDDI when bridging...
Page 6 - Caution; Transparent and SRT Bridging Configuration Task List
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-28 Cisco IOS Bridging and IBM Networking Configuration Guide bridged network. To tie in existing bridges, you must use source-route translational bridging (SR/TLB) instead. SR/TLB is described in the chapter “Co...
Page 7 - Configuring Transparent Bridging and SRT Bridging; Assigning Each Network Interface to a Bridge Group; Command
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-29 Cisco IOS Bridging and IBM Networking Configuration Guide Configuring Transparent Bridging and SRT Bridging To configure transparent and SRT bridging, you must perform the following tasks: • Assigning a Bridg...
Page 8 - Choosing the OUI for Ethernet Type II Frames; Transparently Bridged VLANs for ISL; Assigns a network interface to a bridge group.; Selects the Ethernet Type II OUI encapsulation code.
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-30 Cisco IOS Bridging and IBM Networking Configuration Guide The purpose of placing network interfaces into a bridge group is twofold: • To bridge all nonrouted traffic among the network interfaces making up the...
Page 9 - security association identifier
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-31 Cisco IOS Bridging and IBM Networking Configuration Guide The primary application of transparently bridged VLANs constructed in this way is to separate traffic between bridge groups of local network interface...
Page 10 - Routing between ISL VLANs; Exchange; Specifies a subinterface.; Associates the subinterface with an existing bridge group.
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-32 Cisco IOS Bridging and IBM Networking Configuration Guide To configure a VLAN on a transparently bridged network, use the following commands beginning in global configuration mode: Transparently bridged VLANs...
Page 11 - Figure 10 illustrates the following scenarios:
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-33 Cisco IOS Bridging and IBM Networking Configuration Guide forwarding decision and only switch the traffic to local interfaces configured as belonging to the same VLAN broadcast domain. Router A provides an in...
Page 12 - Configuring a Subscriber Bridge Group; Configuring Transparent Bridging over WANs; Configuring Fast-Switched Transparent Bridging over ATM
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-34 Cisco IOS Bridging and IBM Networking Configuration Guide Configuring a Subscriber Bridge Group The Digital Subscriber Line (xDSL) bridge support feature enables you to configure a router for intelligent brid...
Page 13 - Cisco IOS; Configuring Transparent Bridging over DDR; Defining the Protocols to Bridge; Command Purpose
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-35 Cisco IOS Bridging and IBM Networking Configuration Guide Support for RFC 1483 was added in Cisco IOS Release 12.0(3)T, enabling transparent bridging between Token Ring LANs (using AAL5-SNAP PVCs) and LANs, V...
Page 14 - Determining Access for Bridging; Configuring Transparent Bridging over Frame Relay; Fast-Switched Transparent Bridging; Defines a dialer list for the specified access list.; Assigns the specified interface to a bridge group.
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-36 Cisco IOS Bridging and IBM Networking Configuration Guide Determining Access for Bridging You can determine access by either permitting all bridge packets or by controlling access according to Ethernet type c...
Page 15 - Bridging in a Frame Relay Network with No Multicasts; Configuring Transparent Bridging over Multiprotocol LAPB
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-37 Cisco IOS Bridging and IBM Networking Configuration Guide Bridging in a Frame Relay Network with No Multicasts The Frame Relay bridging software uses the same spanning-tree algorithm as the other bridging fun...
Page 16 - Configuring Transparent Bridging over SMDS; Configuring Transparent Bridging over X.25; Cisco IOS Wide-Area Networking Configuration Guide; Specifies the serial interface.; Configures SMDS encapsulation on the serial interface.; Enables transparent bridging of packets across an SMDS network.
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-38 Cisco IOS Bridging and IBM Networking Configuration Guide Configuring Transparent Bridging over SMDS We support fast-switched transparent bridging for Switched Multimegabit Data Service (SMDS) encapsulated se...
Page 17 - Configuring Concurrent Routing and Bridging; Configuring Integrated Routing and Bridging
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-39 Cisco IOS Bridging and IBM Networking Configuration Guide Configuring Concurrent Routing and Bridging You can configure the Cisco IOS software to route a given protocol among one group of interfaces and concu...
Page 18 - Configuring Interfaces; Use the; show interfaces irb; Configuring the Bridge-Group Virtual Interface; Specifies concentrator port operation.
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-40 Cisco IOS Bridging and IBM Networking Configuration Guide Assigning a Bridge Group Number and Defining the Spanning-Tree Protocol Prior to configuring the router for integrated routing and bridging, you must ...
Page 19 - Configuring Protocols for Routing or Bridging; Enables a bridge-group virtual interface.; Specifies a protocol to be routed in a bridge group.; Specifies that a protocol is not to be routed in a bridge group.; Specifies that a protocol is to be bridged in the bridge group.; Specifies that a protocol is not to be bridged in the bridge group.
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-41 Cisco IOS Bridging and IBM Networking Configuration Guide When you enable routing for a given protocol on the bridge-group virtual interface, packets coming from a routed interface but destined for a host in ...
Page 20 - Configuring Transparent Bridging Options; Disabling IP Routing
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-42 Cisco IOS Bridging and IBM Networking Configuration Guide Note When a bridge group contains Token Ring interfaces, the Token Ring packets must not include RIF. The IEEE 802.1d transparent bridge standard spec...
Page 21 - Enabling Autonomous Bridging; MEC; Configuring LAT Compression; Enables autonomous bridging (if using the ciscoBus2 controller).
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-43 Cisco IOS Bridging and IBM Networking Configuration Guide All interfaces in the bridge group that are bridging IP should have the same IP address. However, if you have more than one bridge group, each bridge ...
Page 22 - Establishing Multiple Spanning-Tree Domains; Establishes a multiple spanning-tree domain.
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-44 Cisco IOS Bridging and IBM Networking Configuration Guide To reduce the amount of bandwidth that LAT traffic consumes on serial interfaces, you can specify a LAT-specific form of compression. Doing so applies...
Page 23 - Preventing the Forwarding of Dynamically Determined Stations; aging time; Filtering Transparently Bridged Packets; Allows the forwarding of frames with multicast source addresses.; Sets the bridge table aging time.
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-45 Cisco IOS Bridging and IBM Networking Configuration Guide Preventing the Forwarding of Dynamically Determined Stations Normally, the system forwards any frames for stations that it has learned about dynamical...
Page 24 - Setting Filters at the MAC Layer
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-46 Cisco IOS Bridging and IBM Networking Configuration Guide • Setting Filters at the MAC Layer, page 46 • Filtering LAT Service Announcements, page 51 Note When setting up administrative filtering, remember tha...
Page 25 - Filtering by Specific MAC Address; Filtering by Vendor Code
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-47 Cisco IOS Bridging and IBM Networking Configuration Guide Filtering by Specific MAC Address You can filter frames with a particular MAC-layer station source or destination address. Any number of addresses can...
Page 26 - Filtering by Protocol Type
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-48 Cisco IOS Bridging and IBM Networking Configuration Guide Filtering by Protocol Type You can filter by protocol type by using the access-list mechanism and specifying a protocol type code. To filter by protoc...
Page 27 - Defining and Applying Extended Access Lists
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-49 Cisco IOS Bridging and IBM Networking Configuration Guide To filter these packets on input or output, use either or both of the following commands in interface configuration mode: You can filter IEEE 802-enca...
Page 28 - end
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-50 Cisco IOS Bridging and IBM Networking Configuration Guide After an access list is created initially, any subsequent additions (possibly entered from the terminal) are placed at the end of the list. In other w...
Page 29 - Filtering LAT Service Announcements
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-51 Cisco IOS Bridging and IBM Networking Configuration Guide Filtering LAT Service Announcements The bridging software allows you to filter LAT frames. LAT bridge filtering allows the selective inclusion or excl...
Page 30 - Adjusting Spanning-Tree Parameters
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-52 Cisco IOS Bridging and IBM Networking Configuration Guide To specify deny or permit conditions for LAT groups on input, use one of the following commands in interface configuration mode: If a message specifie...
Page 31 - Setting the Bridge Priority; Cisco; Adjusting BPDU Intervals
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-53 Cisco IOS Bridging and IBM Networking Configuration Guide Note Only network administrators with a good understanding of how bridges and the Spanning-Tree Protocol work should make adjustments to spanning-tree...
Page 32 - Disabling the Spanning Tree on an Interface; When a; Specifies the interval between hello BPDUs.; Sets the default of the forward delay interval.; Disables the spanning tree on an interface.
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-54 Cisco IOS Bridging and IBM Networking Configuration Guide Note Each bridge in a spanning tree adopts the interval between hello BPDUs, the forward delay interval, and the maximum idle interval parameters of t...
Page 33 - show interfaces
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-55 Cisco IOS Bridging and IBM Networking Configuration Guide Configuring Transparent and IRB Bridging on a PA-12E/2FE Ethernet Switch The PA-12E/2FE Ethernet switch port adapter provides Cisco 7200 series router...
Page 34 - show version
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-56 Cisco IOS Bridging and IBM Networking Configuration Guide Note If you plan to use a PA-12E/2FE interface to boot from a network (TFTP), ensure that the interface is configured for a loop-free environment, an ...
Page 35 - Monitoring and Maintaining the PA-12E/2FE Port Adapter
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-57 Cisco IOS Bridging and IBM Networking Configuration Guide To enable integrated routing and bridging on the bridge groups, perform the following tasks beginning in global configuration mode: Monitoring and Mai...
Page 36 - Cisco IOS Configuration Fundamentals
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Task List BC-58 Cisco IOS Bridging and IBM Networking Configuration Guide Configuring Bridge Groups Using the 12E/2FE VLAN Configuration WebTool The 12E/2FE VLAN Configuration WebTool, shown in Figure 11, is a Web browser-ba...
Page 38 - Tuning the Transparently Bridged Network; Configuring Circuit Groups
Configuring Transparent Bridging Tuning the Transparently Bridged Network BC-60 Cisco IOS Bridging and IBM Networking Configuration Guide Note The VLAN Configuration WebTool hypertext link is listed in the router’s home page only when a PA-12E/2FE port adapter is installed in the router. Tuning the ...
Page 39 - Configuring Constrained Multicast Flooding; Adds a serial interface to a circuit group.; Configures a transmission pause interval.; Distributes base load on the source MAC address only.
Configuring Transparent Bridging Tuning the Transparently Bridged Network BC-61 Cisco IOS Bridging and IBM Networking Configuration Guide To define a circuit group, use the following command in interface configuration mode: For circuit groups of mixed-bandwidth serial interfaces, it might be necessa...
Page 40 - Monitoring and Maintaining the Transparent Bridge Network
Configuring Transparent Bridging Monitoring and Maintaining the Transparent Bridge Network BC-62 Cisco IOS Bridging and IBM Networking Configuration Guide Monitoring and Maintaining the Transparent Bridge Network This section describes how to monitor and maintain activity on the bridged network. You...
Page 41 - Basic Bridging Example
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-63 Cisco IOS Bridging and IBM Networking Configuration Guide • Integrated Routing and Bridging with Multiple Bridge Groups Example, page 67 • Transparently Bridged VLANs Configuration Example, page 67 • Routing b...
Page 42 - The configuration file for the router in Figure 12 is as follows:; Concurrent Routing and Bridging Example
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-64 Cisco IOS Bridging and IBM Networking Configuration Guide The configuration file for the router in Figure 12 is as follows: interface tokenring 0 ip address 131.108.1.1 255.255.255.0 bridge-group 1 ! interface...
Page 43 - Basic Integrated Routing and Bridging Example
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-65 Cisco IOS Bridging and IBM Networking Configuration Guide ! bridge crb bridge 1 protocol ieee bridge 1 route appletalk bridge 1 route ip ! Basic Integrated Routing and Bridging Example Figure 13 is an example ...
Page 45 - Transparently Bridged VLANs Configuration Example
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-67 Cisco IOS Bridging and IBM Networking Configuration Guide Integrated Routing and Bridging with Multiple Bridge Groups Example In the example illustrated in Figure 15, integrated routing and bridging is used to...
Page 46 - Router One
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-68 Cisco IOS Bridging and IBM Networking Configuration Guide Router One bridge 18 protocol ieee interface ethernet 0/1 bridge-group 18 ! interface ethernet 0/2 bridge-group 18 ! interface ethernet 0/3 bridge-grou...
Page 47 - Router Three
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-69 Cisco IOS Bridging and IBM Networking Configuration Guide ! bridge 8 protocol ieee interface ethernet 1/1 bridge-group 8 ! interface ethernet 1/2 bridge-group 8 ! interface ethernet 1/3 bridge-group 8 ! interf...
Page 48 - Routing between VLANs Configuration Example
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-70 Cisco IOS Bridging and IBM Networking Configuration Guide Routing between VLANs Configuration Example The following example shows the configuration for the topology shown in Figure 10. IP traffic is routed to ...
Page 49 - Ethernet Bridging Example; Router/Bridge in Building 1
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-71 Cisco IOS Bridging and IBM Networking Configuration Guide If the other side of the FDDI ring were an FDDI interface running in encapsulation mode rather than in transparent mode, the following additional confi...
Page 50 - Router/Bridge in Building 2; SRT Bridging Example; If there were source-routed traffic to bridge, the
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-72 Cisco IOS Bridging and IBM Networking Configuration Guide Router/Bridge in Building 2 The configuration file for the router in Building 2 is similar to Building 1: decnet address 3.56 ! interface ethernet 0 ip...
Page 51 - Configuration for the New York City Router; Multicast or Broadcast Packets Bridging Example
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-73 Cisco IOS Bridging and IBM Networking Configuration Guide Configuration for the New York City Router interface tokenring 0 ip address 150.136.1.1 255.255.255.128 bridge-group 1 ! interface ethernet 0 ip addres...
Page 52 - The correct access list would be as follows:; X.25 Transparent Bridging Example; Configuration for Bridge 1
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-74 Cisco IOS Bridging and IBM Networking Configuration Guide However, the following configuration might work initially but will eventually fail. The failure occurs because the configuration does not allow for an ...
Page 53 - Configuration for Bridge 3; Frame Relay Transparent Bridging Examples
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-75 Cisco IOS Bridging and IBM Networking Configuration Guide Configuration for Bridge 3 interface serial 0 encapsulation x25 x25 address 31370019565 bridge-group 5 x25 map bridge 31370019027 broadcast x25 map bri...
Page 54 - Bridging in a Frame Relay Network with Multicasts; Transparent Bridging over Multiprotocol LAPB Example
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-76 Cisco IOS Bridging and IBM Networking Configuration Guide Configuration for Bridge 3 interface serial 0 encapsulation frame-relay bridge-group 5 frame-relay map bridge 27 broadcast frame-relay map bridge 134 b...
Page 55 - Fast-Switched Transparent Bridging over ATM Example (Cisco 7000); and a; dialer list protocol list; command that refers to the specified access list.
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-77 Cisco IOS Bridging and IBM Networking Configuration Guide encapsulation lapb multi bridge-group 1 ! bridge 1 protocol ieee Fast-Switched Transparent Bridging over ATM Example (Cisco 7000) The following configu...
Page 56 - Fast-Switched Transparent Bridging over SMDS Example; Complex Transparent Bridging Network Topology Example
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-78 Cisco IOS Bridging and IBM Networking Configuration Guide bridge-group 1 pulse-time 1 ! access-list 200 permit 0x0800 0xFFF8 ! dialer-list 1 protocol bridge list 200 bridge 1 protocol ieee bridge 1 hello 10 Fa...
Page 58 - show span; Configuration for Router A
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-80 Cisco IOS Bridging and IBM Networking Configuration Guide Note To get spanning-tree information by bridge group, use the show span command. Included in this information is the root bridge of the spanning tree....
Page 59 - Configuration for Router B
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-81 Cisco IOS Bridging and IBM Networking Configuration Guide Configuration for Router B Router B demonstrates a simple bridge configuration. It is connected to the FDDI backbone and has domain 2 defined. As such ...
Page 60 - Fast Ethernet Subscriber Port, Frame Relay Trunk Example; ATM Subscriber Ports, ATM Trunk Example
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-82 Cisco IOS Bridging and IBM Networking Configuration Guide interface serial 2 bridge-group 5 bridge-group 5 circuit-group 4 ! bridge 5 domain 3 bridge 5 protocol ieee Fast Ethernet Subscriber Port, Frame Relay ...
Page 61 - command is used to configure each interface for cut-through
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-83 Cisco IOS Bridging and IBM Networking Configuration Guide int atm0 int atm0.1 point-to-point # # Use AAL5 SNAP encapsulation # atm pvc 1 0 101 aal5snap bridge-group 1 int atm0.2 # # Use AAL5 SNAP encapsulation...
Page 62 - Configuration of IRB for PA-12E/2FE Port Adapter Example
Configuring Transparent Bridging Transparent and SRT Bridging Configuration Examples BC-84 Cisco IOS Bridging and IBM Networking Configuration Guide %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet3/1, changed state to up %LINK-3-UPDOWN: Interface FastEthernet3/1, changed state to up Rou...
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