Cisco IOS Software Releases 12.2 T

Table Of Contents

Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

Contents

Prerequisites for Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

Restrictions for Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

Information About Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

Benefits of Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

Need for SVCs to Be Triggered

How to Configure Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

Configuring Bridging on the Router

Configuring an SVC to Carry Bridged Traffic

Configuring an Interface as Part of a Bridge Group

Configuration Examples for Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

ATM SVCs Using IRB Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

Glossary

Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

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First Published: March 17, 2003

Last Updated: February 28, 2006

The Bridged RFC 1483 Encapsulated Traffic over ATM SVCs feature allows you to send bridged RFC 1483 encapsulated packets over ATM switched virtual circuits (SVCs).

History for the Bridged RFC 1483 Encapsulated Traffic over ATM SVCs Feature

Release	Modification
12.2(15)T	This feature was introduced.
12.2(28)SB	This feature was integrated into Cisco IOS Release 12.2(28)SB.

Finding Support Information for Platforms and Cisco IOS Software Images

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Contents

•Prerequisites for Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

•Restrictions for Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

•Information About Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

•How to Configure Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

•Configuration Examples for Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

•Additional References

•Command Reference

•Glossary

Prerequisites for Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

You must have support for a form of bridging such as integrated routing and bridging (IRB).

Restrictions for Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

•Although for certain situations bridging traffic over an ATM SVC or permanent virtual circuit (PVC) is more efficient than routing the bridged traffic, it is not a scalable solution.

•Only fast switching and process switching are supported.

Information About Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

Before configuring and implementing the Bridged RFC 1483 Encapsulated Traffic over ATM SVCs feature, you should understand the following concepts:

•Benefits of Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

•Need for SVCs to Be Triggered

Benefits of Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

Prior to Cisco IOS Release 12.2(13)T, bridged ATM interface support was limited to ATM PVCs. When an ATM interface was part of a bridge group, the bridged traffic could be passed only on the PVCs on that interface. The Bridged RFC 1483 Encapsulated Traffic over ATM SVCs feature allows for bridged RFC 1483 encapsulated traffic to be passed on the ATM SVCs.

Because PVCs are statically configured along the entire path between the end systems, it would not be practical to route bridged encapsulated traffic over them when the user wants to configure the VCs dynamically and tear down the VCs when there is no traffic.

Need for SVCs to Be Triggered

Unlike PVCs, SVCs need to be triggered by ongoing traffic and might be brought down after they have been idle for some time. The Bridged RFC 1483 Encapsulated Traffic over ATM SVCs feature allows for the SVC to be triggered if down, and pass the traffic on to the SVCs belonging to the bridged ATM interface.

How to Configure Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

This section contains the following procedures:

•Configuring Bridging on the Router

•Configuring an SVC to Carry Bridged Traffic

•Configuring an Interface as Part of a Bridge Group

Configuring Bridging on the Router

This section provides the steps necessary to configure bridging on the router.

SUMMARY STEPS

1. enable

2. configure terminal

3. bridge irb

4. bridge bridge-group protocol {dec | ibm | ieee | vlan-bridge}

5. bridge bridge-group route protocol

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. •Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	bridge irb Example: Router(config)# bridge irb	Enables the Cisco IOS software to route a given protocol between routed interfaces and bridge groups or to route a given protocol between bridge groups.
Step 4	bridge bridge-group protocol {dec | ibm | ieee | vlan-bridge} Example: Router(config)# bridge 5 protocol ieee	Defines the type of spanning-tree protocol.
Step 5	bridge bridge-group route protocol Example: Router(config)# bridge 5 route ip	Enables the routing of a specified protocol in a specified bridge group.

Configuring an SVC to Carry Bridged Traffic

This section provides the steps necessary to configure an SVC to carry bridged traffic.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface type slot/pot.subinterface-number multipoint

4. atm esi-address esi.selector

5. svc [name] [nsap address] [ces]

6. encapsulation aal5encap [virtual-template number]

7. protocol protocol {protocol-address | inarp} [[no] broadcast]

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. •Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	interface type slot/pot.subinterface-number multipoint Example: Router(config)# interface ATM1/0.5 multipoint	Configures an interface type and enters interface configuration mode. •Configures an ATM multipoint subinterface.
Step 4	atm esi-address esi.selector Example: Router(config-if)# atm esi-address AAAAAAAAAAAA.00	Enables the end system identifier (ESI) and selector byte fields of the ATM NSAP address. •Configures an ATM end system address.
Step 5	svc [name] [nsap address] [ces] Example: Router(config-if)# svc bridged_1483 nsap 47.009181000000444455556666.BBBBBBBBBBBB.00	Creates an ATM SVC and specifies the destination network service access point (NSAP) address on an interface or subinterface.
Step 6	encapsulation aal5encap [virtual-template number] Example: Router(config-if)# encapsulation aal5snap	Configures the ATM adaptation layer (AAL) and encapsulation type for an ATM PVC, SVC, VC class, or VC bundle. •Configures aalsnap encapsulation on the SVC.
Step 7	protocol protocol {protocol-address | inarp} [[no] broadcast] Example: Router(config-if)# protocol bridge broadcast	Configures a static map for an ATM PVC, SVC, or VC class or enables Inverse Address Resolution Protocol (ARP) or Inverse ARP broadcasts on an ATM PVC. •Configures a static map for the bridge protocol.

Configuring an Interface as Part of a Bridge Group

This section provides the steps necessary to configure an interface as part of a bridge group.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface type slot/port

4. bridge-group bridge-group

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. •Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	interface type slot/port Example: Router(config)# interface GigabitEthernet 0/0	Configures an interface type and enters interface configuration mode.
Step 4	bridge-group bridge-group Example: Router(config-if)# bridge-group 5	Associates the interface with an existing bridge group.

Configuration Examples for Bridged RFC 1483 Encapsulated Traffic over ATM SVCs

This section provides the following configuration example:

•ATM SVCs Using IRB Example

ATM SVCs Using IRB Example

Router A and Router B have bridge groups containing an Ethernet and an ATM interface. As shown in Figure 1, the traffic arriving on the Ethernet interface on Router A is bridged across the ATM network and reaches the Ethernet interface on Router B.

Figure 1

RFC 1483 Traffic over an ATM Network

The following configuration example shows ATM SVCs being configured to use IRB.

Configuration for Router A

!

hostname Router A

!

bridge irb

!

!

interface GigabitEthernet0/0

 no ip address

 duplex auto

 speed auto

!

interface GigabitEthernet0/0.5

 encapsulation dot1Q 5

 bridge-group 5

!

interface ATM1/0

 no ip address

 no atm ilmi-keepalive

 pvc signal 0/5 qsaal

 !

 pvc ilmi 0/16 ilmi

 !

!

interface ATM1/0.5 multipoint

 atm esi-address AAAAAAAAAAAA.00

 !

 svc bridged_1483 nsap 47.009181000000444455556666.BBBBBBBBBBBB.00

  encapsulation aal5snap

  protocol bridge broadcast

 !

 bridge-group 5

!

!

interface BVI5

 ip address 10.0.5.1 255.255.255.0

!

bridge 5 protocol ieee

 bridge 5 route ip

!

Configuration for Router B

!

hostname Router B

!

bridge irb

!

!

interface GigabitEthernet0/0

 no ip address

 duplex auto

 speed auto

!

interface GigabitEthernet0/0.5

 encapsulation dot1Q 5

 bridge-group 5

!

interface ATM1/0

 no ip address

 no atm ilmi-keepalive

 pvc signal 0/5 qsaal

 !

 pvc ilmi 0/16 ilmi

 !

!

interface ATM1/0.5 multipoint

 atm esi-address BBBBBBBBBBBB.00

 !

 svc bridged_1483 nsap 47.009181000000111122223333.AAAAAAAAAAAA.00

  encapsulation aal5snap

  protocol bridge broadcast

 !

 bridge-group 5

!

!

interface BVI5

 ip address 10.0.5.2 255.255.255.0

!

bridge 5 protocol ieee

 bridge 5 route ip

!

Additional References

The following sections provide additional references related to the Bridged RFC 1483 Encapsulated Traffic over ATM SVCs feature.

Related Documents

Related Topic	Document Title
ATM routed bridge encapsulation configuration tasks	The chapter "Configuring ATM" in Cisco IOS Wide-Area Networking Configuration Guide, Release 12.2
ATM commands	The chapter "ATM Commands" in Cisco IOS Wide-Area Networking Command Reference, Release 12.2 T
Transparent bridging configuration tasks	The chapter "Configuring Transparent Bridging" in Cisco IOS Bridging and IBM Networking Configuration Guide, Release 12.2
Bridging commands	The chapter "Bridging" in Cisco IOS Bridging and IBM Networking Command Reference, Volume 1 of 2, Release 12.2 T

Standards

Standards	Title
None	—

MIBs

MIBs	MIBs Link
None	To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL: http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml

RFCs

RFCs	Title
RFC 1483	Multiprotocol Encapsulation over ATM Adaptation Layer 5.

Technical Assistance

Description	Link
The Cisco Technical Support website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.	http://www.cisco.com/techsupport

Command Reference

None.

Glossary

AAL—ATM adaptation layer. Service-dependent sublayer of the data link layer.

ESI—end system identifier.

IRB—Integrated routing and bridging. An upper-layer application supported by SS7 for connection set up and tear down.

PVC—Permanent virtual circuit.

SVC—Switched virtual circuit.

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Note Refer to the Internetworking Terms and Acronyms for terms not included in this glossary.

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Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.

© 2003, 2006 Cisco Systems, Inc. All rights reserved.