Transparent Bridging:

Lessons Learned:

 

IOS can route or bridge a protocol, not both at same time.

-router –IP routed by

-Switch – IP bridged by default

 

Transparent bridging subject to normal STP rules.

-only one active path

-root bridge election

-root port election

-designated port election

 

Configuring Transparent bridging

Disable IP routing (if bridging IP)

-No IP routing

 

Configure transparent bridge group

-bridge 1 protocol ieee

 

Apply bridge group to the interface

-bridge-group 1

 

Static resolution over multipoint NBMA

-frame-relay map bridge (as opposed to frame-relay map IP)

 

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Once configured you can issue

# sh bridge 1

 (with 1 being the vlan) this would be the same as showing the MAC address table on a switch.

 

#Sh bridge 1 group

Shows the interfaces the are running the STP process.

 

#Sh spanning-tree 1

Will show the detailed output for the STP path selection. Same as # sh spanning-tree vlan detail, etc.

 

Make sure to disable IP routing -

 

IRB –

integrate routing and bridging:

In the bridge domain, creates what is known as the BVI what is used to bridge traffic between and route traffic between the bridge and routed interfaces. When IRB is on, you can support both routing and bridging on the same interfaces.

 

IRB:

IRB allows ot route & bridge same protocol stack on same interface.

Uses BVI to connect bridged domain and routed domain.

-same principle as SVI on catalyst.

 

Config:

Configure bridge group

Bridge 1 protocol ieee

Bridge-group 1

Enable IRB (enable globally)

-bridge irb

Enable routing and bridging for the bridge & routing domain

Bridge 1 bridge ip

Bridge 1 route ip

Configure BVI to connect & routed domain