Cisco Systems OL-1911-05 User Manual
CHAPTER
24
Configuring ATM Router Module Interfaces
This chapter describes steps required to configure the ATM router module on the Catalyst 8540 MSR,
Catalyst 8510 MSR, and LightStream 1010 ATM switch routers, and the enhanced ATM router module
for the Catalyst 8540 MSR. The ATM router module allows you to integrate Layer 3 switching with
ATM switching on the same ATM switch router.
Note This chapter provides advanced configuration instructions for the Catalyst 8540 MSR,
Catalyst 8510 MSR, and LightStream 1010 ATM switch routers. For complete descriptions of the
commands mentioned in this chapter, refer to the ATM Switch Router Command Reference
publication. For hardware installation and cabling instructions, refer to the ATM and Layer 3 Module
Installation Guide.
Note The LightStream 1010 system software image does not include support for the ATM router module
or Layer 3 features. You can download the Catalyst 8510 MSR image to a LightStream 1010 ATM
switch router with a multiservice ATM switch processor installed.
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This chapter includes the following sections:
• Overview of the ATM Router Module, page 24-2
• Hardware and Software Restrictions of the ATM Router Module, page 24-5
• Configuring ATM Router Module Interfaces, page 24-9
• Configuring LECs on ATM Router Module Interfaces (Catalyst 8540 MSR), page 24-11
• Configuring Multiprotocol Encapsulation over ATM, page 24-16
• Configuring Classical IP over ATM in a PVC Environment, page 24-19
• Configuring Bridging, page 24-24
• Configuring IP Multicast, page 24-27
• About Rate Limiting, page 24-27
• Configuring Rate Limiting, page 24-28
ATM and Layer 3 Switch Router Software Configuration Guide
24-1
Overview of the ATM Router Module
Overview of the ATM Router Module
The ATM router module allows you to integrate Layer 3 routing and ATM switching within a single
chassis. When you install the ATM router module, you no longer need to choose either Layer 3 or ATM
technology, as is frequently the case with enterprise, campus, and MAN applications.
The ATM router module can perform one or more of the functions described in Figure 24-1.
Figure 24-1 ATM Router Module Routing and Bridging Functions
ATM to ATM bridging
Chapter 24 Configuring ATM Router Module Interfaces
ATM
Subnet A
ATM switch
IP routing of ATM to or from ATM and Ethernet
ATM
Subnet B
ATM switch
ATM to ATM routing
ATM
Subnet B
ATM switch
ATM
Subnet A
ATM
Subnet A
ATM
Subnet A
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The ATM router module receives Address Resolution Protocol (ARP) messages and route broadcasts
from connected ATM peers and sends the appropriate control information to the route processor. On the
ATM side, the ATM router module connects to the switching fabric as would any other interface module.
On the Catalyst 8540 MSR, the ATM router module supports LANE clients (LECs), but not LANE
servers (LES, LECS, and BUS). It separates the control and data path so that all LANE control messages
are handled by the route processor, and data messages are switched on the ATM router module port, as
shown in Figure 24-2. The LEC is configured on the ATM router module interface, but control message
traffic is sent to the route processor by the ATM router module. The ATM router module sends all ATM
data traffic to the appropriate VCs.
24-2
ATM and Layer 3 Switch Router Software Configuration Guide
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Chapter 24 Configuring ATM Router Module Interfaces
Figure 24-2 ATM Router Module Traffic Flow (Catalyst 8540 MSR)
Overview of the ATM Router Module
ATM cells NNI
LANE signalling
Interface slot
ATM interface module
FE or GE interface module
Interface slot
Route processor
Switch processor
Switch processor
Switch processor
Route processor
Interface slot
Interface slot
Interface slot
ATM router module
Interface slot
Power supply 1 Power supply 2
IPX packets/
Ethernet frames
31333
Catalyst 8540 MSR Enhanced ATM Router Module Features
The Catalyst 8540 MSR enhanced ATM router module offers the following benefits:
• Interoperates with all of the Layer 3 switching interface modules available for the
Catalyst 8540 CSR chassis. For more information on the Catalyst 8540 CSR Layer 3 interface
modules, refer to the ATM and Layer 3 Module Installation Guide.
• Provides an integrated high performance link between ATM and Layer 3 cards. The ATM router
module provides an aggregate switching capacity of 2 Gbps between ATM and Layer 3 ports
(2 x 1-Gbps interfaces per module). Data transfers to the switch core at the rate of 1 Gbps.
• Simplifies management.
• Hot-swappable.
• Occupies only one slot in the chassis.
• Supports multiprotocol encapsulation over ATM (RFC 1483) switched virtual connections (SVCs),
soft permanent virtual circuits (PVCs) and permanent PVCs with either ATM adaptation layer 5
(AAL5) Subnetwork Access Protocol (SNAP) or AAL5 MUX encapsulation.
• Supports classical ATM over IP (RFC 1577) SVCs and PVCs.
• Standard and extended access control list (ACL) support for IP, and standard ACL support for IPX.
For information configuring on IP ACLs, see Chapter 11, “Using Access Control,” and refer to the
“Configuring IP Services” chapter in the Cisco IOS IP and IP Routing Configuration Guide. For
information configuring on IPX ACLs, refer to the “Configuring Novell IPX” chapter in the Cisco
IOS AppleTalk and Novell IPX Configuration Guide.
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ATM and Layer 3 Switch Router Software Configuration Guide
24-3
Overview of the ATM Router Module
• IP fragmentation support.
• IP 6-path load balancing support.
• Supports OAM-based PVC management.
• Supports Bridge Group Virtual Interface (BVI).
• Supports integrated routing and bridging (IRB).
Note The Catalyst 8540 MSR enhanced ATM router module does not support LANE clients.
The ATM router module has no external interfaces. All traffic is sent and received through internal
interfaces to the switching fabric. The Catalyst 8540 MSR enhanced ATM router module has two
internal ports.
Catalyst 8540 MSR ATM Router Module Features
The Catalyst 8540 MSR ATM router module offers the following benefits:
• Interoperates with all of the Layer 3 switching interface modules available for the
Catalyst 8540 CSR chassis. For more information on the Catalyst 8540 CSR Layer 3 interface
modules, refer to the ATM and Layer 3 Module Installation Guide.
• Provides an integrated high performance link between ATM and Layer 3 cards. The ATM router
module provides an aggregate switching capacity of 2 Gbps between ATM and Layer 3 ports
(2 x 1-Gbps interfaces per module). Data transfers to the switch core at the rate of 1 Gbps.
• Simplifies management.
• Hot-swappable.
• Occupies only one slot in the chassis.
• Supports LANE clients (LECs).
• Supports RFC 1483 SVCs and PVCs with AAL5 SNAP encapsulation.
• Supports RFC 1577 SVCs and PVCs.
• Supports Soft PVCs
• Supports VBR
• Supports Shaped Tunnels
• Supports OAM-based PVC management.
• Supports BVI.
• Supports IRB.
The ATM router module has no external interfaces. All traffic is sent and received through internal
interfaces to the switching fabric. The Catalyst 8540 MSR enhanced ATM router module has two
internal ports.
Chapter 24 Configuring ATM Router Module Interfaces
24-4
ATM and Layer 3 Switch Router Software Configuration Guide
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Chapter 24 Configuring ATM Router Module Interfaces
Hardware and Software Restrictions of the ATM Router Module
Catalyst 8510 MSR and LightStream 1010 ATM Router Module Features
The Catalyst 8510 MSR and LightStream 1010 ATM router module offers the following benefits:
• Interoperates with all of the Layer 3 switching interface modules available for the
Catalyst 8510 CSR chassis. For more information on the Catalyst 8510 CSR Layer 3 interface
modules, refer to the ATM and Layer 3 Module Installation Guide.
• Provides an integrated high performance link between ATM and Layer 3 cards. The ATM router
module provides a switching capacity of 1 Gbps between ATM and Layer 3 ports. Data transfers to
the switch core at the rate of 1 Gbps.
• Simplifies management.
• Hot-swappable.
• Occupies only one slot in the chassis.
• Supports RFC 1483 SVCs and PVCs with AAL5 SNAP encapsulation.
• Supports RFC 1577 SVCs and PVCs.
• Supports OAM-based PVC management.
• Supports BVI.
• Supports IRB.
• Supports VBR.
The ATM router module has no external interfaces. All traffic is sent and received through internal
interfaces to the switching fabric. The Catalyst 8510 MSR and LightStream 1010 ATM router module
has one internal port.
Hardware and Software Restrictions of the ATM Router Module
Hardware Restrictions
The following hardware restrictions apply to the Catalyst 8540 MSR, Catalyst 8510 MSR, and
LightStream 1010 ATM router modules, and the Catalyst 8540 MSR enhanced ATM router modules:
• You can install the ATM router module in any slot except a route processor slot, and, in the case of
the Catalyst 8540 MSR, a switch processor slot.
• The ATM router module is only supported on LightStream 1010 ATM switches with multiservice
ATM switch route processor with FC-PFQ and the Catalyst 8510 MSR system software image.
• You can install up to two ATM router modules per chassis.
• When you hot swap an ATM router module, wait one minute after removing the module before
inserting a new module.
Note The ATM router module is only supported on ATM switches which have multiservice ATM
switch processor installed.
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ATM and Layer 3 Switch Router Software Configuration Guide
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Chapter 24 Configuring ATM Router Module Interfaces
Hardware and Software Restrictions of the ATM Router Module
Catalyst 8540 MSR Enhanced ATM Router Module Software Restrictions
The following software restrictions apply to the Catalyst 8540 MSR enhanced ATM router module:
• LANE is not supported.
• LANE Clients are not supported.
• Use tag switching functionality with caution. Do not distribute routes learned through tag switching
to Fast Ethernet (FE) or Gigabit Ethernet (GE), or vice versa. Otherwise, you might have
unreachable route destinations.
• The ATM router module does not initialize if it replaces an ATM port adapter or interface module
when hierarchical VP tunnels are globally enabled. Reboot the switch to initialize the ATM router
module.
• IP multicast is only supported over 1483 LLC/SNAP encapsulated PVCs.
• ATM Director does not support any PVC commands.
• Even though each ATM router module interface supports a maximum of 2048 VCs, only
1400 to 1500 external VCs can be configured. Internal VCs use up the rest.
• Do not install an ATM router module in a slot pair where hierarchical VP tunnels are configured.
Slot pairs 0 and 1, 2 and 3, 9 and 10, and 11 and 12 use the same switching modules for scheduling.
For example, do not install an ATM router module in slot 10 when hierarchical VP tunnels are
configuredon slot 9. For more information on hierarchical VP tunneling restrictions, see Chapter 6,
“Configuring Virtual Connections.”
The Catalyst 8540 MSR enhanced ATM router modules do not support the following features:
• Tag-edged router functionality
• Fast Simple Server Redundancy Protocol (FSSRP)
• Bridging for multiplexing device encapsulation
• Protocol Independent Multicast (PIM) IP multipoint signalling
• PIM nonbroadcast multiaccess (NBMA)
• PIM over ATM multipoint signalling
• Translation from IP quality of service (QoS) to ATM QoS
• Resource Reservation Protocol (RSVP) to ATM SVC
• PVC management using ILMI
• IP multicast over RFC 1483 SVCs
• Access lists for ATM to ATM routing
• Half-bridge devices
• Layer 2 ACLs
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ATM and Layer 3 Switch Router Software Configuration Guide
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Chapter 24 Configuring ATM Router Module Interfaces
Hardware and Software Restrictions of the ATM Router Module
Catalyst 8540 MSR ATM Router Module Software Restrictions
The following software restrictions apply to the Catalyst 8540 MSR ATM router module:
• Use tag switching functionality with caution. Do not distribute routes learned through tag switching
to FE or GE, or vice versa. Otherwise, you might have unreachable route destinations.
• The ATM router module does not initialize if it replaces an ATM port adapter or interface module
when hierarchical VP tunnels are globally enabled. Reboot the switch to initialize the ATM router
module.
• ATM Director does not support any PVC commands.
• Only LANE clients or RFC 1483, not both, can be configured on an ATM router module interface.
• RFC 1483 on the ATM router module supports only AAL5 SNAP encapsulation.
• Even though each ATM router module interface supports a maximum of 2048 VCs, only
1400 to 1500 external VCs can be configured. Internal VCs use up the rest.
• IP multicast is only supported over 1483 LLC/SNAP encapsulated PVCs.
• You can have a maximum of 64 LECs per chassis.
• Do not install an ATM router module in a slot pair where hierarchical VP tunnels are configured.
Slot pairs 0 and 1, 2 and 3, 9 and 10, and 11 and 12 use the same switching modules for scheduling.
For example, do not install an ATM router module in slot 10 when hierarchical VP tunnels are
configuredon slot 9. For more information on hierarchical VP tunneling restrictions, see Chapter 6,
“Configuring Virtual Connections.”
• Token Ring LANE is not supported.
The Catalyst 8540 MSR ATM router modules do not support the following features:
• Tag-edged router functionality
• Fast Simple Server Redundancy Protocol (SSRP)
• Bridging for multiplexing device encapsulation
• PIM IP multipoint signalling
• PIM NBMA
• PIM over ATM multipoint signalling
• Translation from IP QoS to ATM QoS
• RSVP to ATM SVC
• PVC management using ILMI
• Access lists for ATM to ATM routing
• Half-bridge devices
• RFC 1483 MUX encapsulation
• IP multicast over RFC 1483 SVCs
• ACLs for IP, and standard ACLs for IPX
• IP fragmentation.
• IP 6-path load balancing.
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ATM and Layer 3 Switch Router Software Configuration Guide
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Chapter 24 Configuring ATM Router Module Interfaces
Hardware and Software Restrictions of the ATM Router Module
Catalyst 8540 MSR and LightStream 1010 ATM Router Module Software
Restrictions
The following software restrictions apply to the Catalyst 8540 MSR enhanced ATM router module:
• Use tag switching functionality with caution. Do not distribute routes learned through tag switching
to FE or GE, or vice versa. Otherwise, you might have unreachable route destinations.
• The ATM router module does not initialize if it replaces an ATM port adapter or interface module
when hierarchical VP tunnels are globally enabled. Reboot the switch to initialize the ATM router
module.
• ATM Director does not support any PVC commands.
• RFC 1483 on the ATM router module supports only AAL5 SNAP encapsulation.
• Even though each ATM router module interface supports a maximum of 2048 VCs, only
1400 to 1500 external VCs can be configured. Internal VCs use up the rest.
• Do not install an ATM router module in a slot pair where hierarchical VP tunnels are configured.
Slot pair 0 and 1 and slot pair 3 and 4 use the same switching modules for scheduling. For example,
do not install an ATM router module in slot 1 when hierarchical VP tunnels are configured on slot 0.
For more information on hierarchical VP tunneling restrictions, see Chapter 6, “ConfiguringVirtual
Connections.”
• RFC 1577 SVCs
• LANE clients are not supported.
• Only UBR PVCs are supported.
• IP multicast is only supported over 1483 LLC/SNAP encapsulated PVCs.
The Catalyst 8510 MSR and LightStream 1010 ATM router modules do not support the following
features:
• Point-to-point subinterfaces. Only point-to-multipoint subinterfaces are supported.
• Tag-edged router functionality
• SSRP
• Bridging for multiplexing device encapsulation
• Protocol Independent Multicast (PIM) IP multipoint signalling
• PIM nonbroadcast multiaccess (NBMA)
• PIM over ATM multipoint signalling
• Translation from IP quality of service (QoS) to ATM QoS
• Resource Reservation Protocol (RSVP) to ATM SVC
• PVC management using ILMI
• Access lists for ATM to ATM routing
• Half-bridge devices
• RFC 1483 MUX encapsulation
• IP multicast over RFC 1483 SVCs
• ACLs for IP, and standard ACLs for IPX
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ATM and Layer 3 Switch Router Software Configuration Guide
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Chapter 24 Configuring ATM Router Module Interfaces
• IP fragmentation.
• IP 6-path load balancing.
Note The ATM router module is only supported on ATM switches which have a multiservice ATM switch
processor installed.
Note The LightStream 1010 system software image does not include support for the ATM router module
or Layer 3 features. You can download this image to a LightStream 1010 ATM switch router with a
multiservice ATM switch processor installed.
Configuring ATM Router Module Interfaces
The you can configure the following features directly on the ATM router module interfaces:
• Maximum virtual channel identifier (VCI) bits
• Maximum Transmission Units (MTUs) (enhanced Catalyst 8540 MSR)
• LANE clients (Catalyst 8540 MSR)
• RFC 1483
• Classical IP over ATM (RFC 1577)
• Bridging
• IP multicast
Configuring ATM Router Module Interfaces
Note This document describes how to configure ATM software features combined with Layer 3 features
only. For more detailed information on how to configure the Layer 3 modules that interoperate with
the ATM router module in the Catalyst 8540 MSR chassis, refer to the Layer 3 Switching Software
Feature and ConfigurationGuide, which is available on the Documentation CD-ROMthat came with
your ATM switch router, online at Cisco.com, or when ordered separately as a hard copy document.
Note ATM router modules have internal interfaces, but no external ports. Use the interface atm
card/subcard/port command to specify these interfaces.
Note Virtualpathidentifier(VPI)2 is reserved for ATM router module interfaces, which allowsup to 2048
external VCs on each ATM router module interface. Using VPI 0 would haveallowed less than 1024
external VCs on an ATM router module interface because the ATM router module external VCs
would have been forced to share the VC space within VPI 0 with the internal PVCs.
Even though each ATM router module interface supports a maximum of 2048 VCs, only
1400 to 1500 external VCs can be configured. Internal VCs use up the rest.
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ATM and Layer 3 Switch Router Software Configuration Guide
24-9
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