configuration transparent bridging.htm

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                      |
                 |----------|
                     LAN4
</pre>

<p>In this example, the router acts as two different bridges, one
between Lan1 and Lan2, and one between Lan3 and Lan4. Frames from
Lan1 are bridged to Lan2, but not to Lan3 or Lan4, and vice
versa. In other words, frames are bridged only among interfaces
in the same group. This grouping feature is commonly used to
separate networks or users. </p>

<pre>
  interface ethernet 0
  bridge group 1
</pre>

<pre>  interface ethernet 1 
  bridge group 1 </pre>

<pre>  interface ethernet 2 
  bridge group 2 </pre>

<pre>  interface ethernet 3 
  bridge group 2 </pre>

<pre>  bridge group 1 protocol ieee 
  bridge group 2 protocol dec </pre>

<h3>Example # 3 : Bridging Over a Wide Area Network</h3>

<pre>
              -                                -
              |   ----------S0    ----------   |
              | E0| ROUTER |---   | ROUTER |E0 |
          LAN1|---|   A    |  / S0|   B    |---|LAN2
              |   |        |  ----|        |   |
              |   ----------      ----------   |
              -                                -
</pre>

<p>In this example, the two LANs are connected by a T1 link. </p>

<pre>
  Router A                        Router B
  --------                        --------
  Interface ethernet 0            Interface ethernet 0
  bridge-group 1                  bridge-group 1</pre>

<pre>  Interface serial 0              Interface serial 0 
  bridge-group 1 		  bridge-group 1 </pre>

<pre>  bridge group 1 protocol ieee    bridge group 1 protocol ieee </pre>

<h3>Example # 4 : Remote Transparent Bridging Over X.25</h3>

<p>This example uses the same topology as Example 3, but instead
of the lease line that connects the two routers, let's say that
Router A and Router B are connected through an X.25 cloud. </p>

<pre>
  Router A                             Router B
  --------                             --------
  Interface ethernet 0                 Interface ethernet 0
  bridge-group 1                       bridge-group 1</pre>

<pre>  Interface serial 0                   Interface serial 0 
  encapsulation x25                    encapsulation x25 
  x25 address 31370019027              x25 address 31370019134 
  x25 map bridge 31370019134broadcast  x25 map bridge 31370019027 broadcast 
  bridge-group 1 		       bridge-group 1 </pre>

<pre>  bridge group 1 protocol ieee         bridge group 1 protocol ieee </pre>

<h3>Example # 5 : Remote Transparent Bridging Over Frame Relay
With No Multicast</h3>

<p>This example uses the same topology as Example 3, but instead
of the lease line that connects the two routers, let's say that
Router A and Router B are connected through a Public Frame Relay
network. The Frame Relay bridging software uses the same
spanning-tree algorithm as the other bridging functions, but it
allows packets to be encapsulated for transmission across a Frame
relay network. The commands specify Internet to DLCI address
mapping and maintain a table of both the Ethernet and DLCIs. </p>

<pre>
  Router A                              Router B
  --------                              --------
  Interface ethernet 0                  Interface ethernet 0
  bridge-group 1                        bridge-group 1
</pre>

<pre>  Interface serial 0                    Interface serial 0 
  encapsulation frame-relay             encapsulation frame-relay 
  frame-relay map bridge 25 broadcast   frame-relay map bridge 30 broadcast 
  bridge-group 1 		        bridge-group 1 </pre>

<pre>  bridge group 1 protocol dec           bridge group 1 protocol dec </pre>

<h3>Example # 6 : Remote Transparent Bridging Over Frame Relay
With Multicast</h3>

<p>This example uses the same topology as Example 5, but here the
Frame Relay network supports a multicast facility. The multicast
facility learns about the other bridges on the network,
eliminating the need for the <b>frame-relay map</b> command. </p>

<pre>
  Router A                        Router B
  --------                        --------
  Interface ethernet 0            Interface ethernet 0
  bridge-group 2                  bridge-group 2</pre>

<pre>  Interface serial 0              Interface serial 0 
  encapsulation frame-relay       encapsulation frame-relay 
  bridge-group 2   		bridge-group 2 </pre>

<pre>  bridge group 2 protocol dec     bridge group 2 protocol dec </pre>

<h3>Example # 7 : Remote Transparent Bridging Over Frame Relay
With multi- sub-interface</h3>

<p>To use a sub-interface, you must define <b>bridge-group</b>
statements on both the sub-interface and the main interface. </p>

<pre>
  Router A                             Router B
  --------                             --------
  interface ethernet 0                 interface ethernet 0
  bridge-group 2                       bridge-group 2</pre>

<pre>  interface serial 0 		       interface serial 0 
  encapsulation frame-relay            encapsulation frame-relay 
  bridge-group 2                       bridge-group 2 
  ! 				       ! 
  interface Serial0.1 point-to-point   interface Serial0.1 point-to-point 
  frame-relay interface-dlci 101       frame-relay interface-dlci 100 
  bridge-group 2        	       bridge-group 2 
  ! 				       ! 
  interface Serial0.2 point-to-point   interface Serial0.2 point-to-point 
  frame-relay interface-dlci 103       frame-relay interface-dlci 103 
  bridge-group 2 		       bridge-group 2 </pre>

<pre>  bridge group 2 protocol dec          bridge group 2 protocol dec </pre>

<h3>Example # 8 : Remote Transparent Bridging Over SMDS</h3>

<pre>
  Router A                             Router B
  --------                             --------
  Interface ethernet 0                 Interface ethernet 0
  bridge-group 2                       bridge-group 2
</pre>

<pre>  Interface Hssi0                      Interface Hssi0 
  encapsulation smds                   encapsulation smds smds 
  address c449.1812.0013               smds address c448.1812.0014 s
  mds multicast BRIDGE 		       smds multicast BRIDGE 
  e449.1810.0040                       e449.1810.0040 
  bridge-group 2 		       bridge-group 2 </pre>

<pre>  bridge group 2 protocol dec          bridge group 2 protocol dec </pre>

<h3>Example # 9 : Remote Transparent Bridging With Circuit Group</h3>

<p>In normal operation, parallel network segments can't all be
carrying traffic at the same time. This is necessary to prevent
frame looping. In the case of serial lines, however, you may want
to increase the available bandwidth by using multiple parallel
serial lines. Use the &quot;circuit- group&quot; option to do
this. </p>

<pre>
              -                                 -
              |   ----------S0   S0----------   |
              |   |        |---/---|        |   |
              |   | ROUTER |S1   S1| ROUTER |   |
              | E0|        |---/---|        |E0 |
          LAN1|---|   A    |S2   S2|   B    |---|LAN2
              |   |        |---/---|        |   |
              |   ----------       ----------   |
              -                                 -
</pre>

<pre>Router A 			Router B 
-------- 			-------- 
Interface ethernet 0 		Interface ethernet 0 
bridge-group 2 			bridge-group 2 </pre>

<pre>Interface serial0 		Interface serial0 
bridge-group 2			bridge-group 2 
bridge-group 2 circuit-group 1 	bridge-group 2 circuit-group 1 </pre>

<pre>Interface serial1 		Interface serial1 
bridge-group 2 			bridge-group 2 
bridge-group 2 circuit-group 1 	bridge-group 2 circuit-group 1 </pre>

<pre>Interface serial2 		Interface serial2 
bridge-group 2 			bridge-group 2 
bridge-group 2 			circuit-group 1 bridge-group 2 circuit-group 1 </pre>

<pre>bridge group 2 protocol dec 	bridge group 2 protocol dec </pre>

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