ATM and Layer 3 Quick Software Configuration Guide, 12.1(5)EY1
Configuring LANE
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Table Of Contents

Configuring LANE

Understanding LANE on ATM

Understanding LANE Components

Implementing LANE

Supporting LAN Protocols

Addressing

Assigning Components to Interfaces and Subinterfaces

Configuring LANE Router and LAN Switch Requirements

Configuring a LEC

Configuring the LECS

Configuring the ATM Address of the LECS

Configuring the LECS Database

Configuring the LES/BUS

LANE Configuration Examples

Verifying Connectivity

Configuring LANE

This chapter describes how to configure LAN emulation (LANE) on the switch router, and includes the following sections:

• Understanding LANE on ATM

• Understanding LANE Components

• Implementing LANE

• Configuring a LEC

• Configuring the LECS

• Configuring the LES/BUS

• LANE Configuration Examples

Note For more software configuration information about LANE, refer to the ATM Switch Router Software Configuration Guide. Refer to the ATM Switch Router Command Reference publication for command syntax.

Understanding LANE on ATM

LANE is a protocol that allows devices attached to traditional LANs (such as Ethernet and Token Ring) to connect to ATM networks. That is, LANE allows legacy LAN users to take advantage of the benefits of ATM without modifying end station hardware or software.

LANE services provide connectivity between ATM-attached devices and LAN-attached devices. Two primary applications of LANE follow:

•Connectivity between LAN-attached stations across a high-speed ATM transport backbone.

•Connectivity between ATM-attached hosts and LAN-attached hosts. Centralized hosts with high-speed ATM port adapters provide services (such as Domain Name Service [DNS]) to traditional LAN-attached devices.

Understanding LANE Components

A single emulated LAN (ELAN) includes the following components:

•LANE client (LEC)—A software client that resides in an end station (such as a workstation, LAN switch, or router). The LEC performs data forwarding and receiving, address resolution, and other control functions for a single endpoint in a single ELAN. A router or switch can have multiple LANE clients, each connecting with different ELANs. The LANE client registers its MAC and ATM address with the LES.

•LANE configuration server (LECS)—A server that assigns individual LECs to particular ELANs by providing to the LECs the ATM address of the LES. The LECS maintains a database of ELAN names and the corresponding addresses of the LESs. A LECS can serve multiple ELANs. One LECS must be configured for each LANE cloud.

Note The LECS is also used for security by restricting ELAN membership to certain LECs, based on their MAC addresses.

•LANE server (LES)—A server that registers LECs to join the ELAN. In LANE 1.0, without Simple Server Redundancy Protocol (SSRP), each ELAN has only one Cisco LES, which handles LAN Emulation Address Resolution Protocol (LE_ARP) requests.

•Broadcast-and-unknown server (BUS)—A server that floods unknown destination addresses and forwards multicast and broadcast traffic to clients within an ELAN. In LANE 1.0 without SSRP, one Cisco BUS exists per ELAN.

Implementing LANE

The following sections describe specific information and considerations you might need to consider prior to LANE implementation:

• Supporting LAN Protocols

• Addressing

• Assigning Components to Interfaces and Subinterfaces

Supporting LAN Protocols

The switch router supports both Ethernet and Token Ring LANE. This chapter describes only Ethernet configuration information. For Token Ring configuration information, refer to the ATM Switch Router Software Configuration Guide.

Addressing

On a LAN, packets are addressed by the MAC-layer address of the destination and source stations. To provide similar functionality for LANE, every LANE client must have a MAC address. In addition, every LANE component (LES, LEC, BUS, and LECS) must have a unique ATM address.

All LANE clients on the same interface have the same automatically assigned MAC address, which is also used as the end-system identifier (ESI) part of the ATM address. Although client MAC addresses are not unique, all ATM addresses are unique.

Assigning Components to Interfaces and Subinterfaces

The following rules apply to assigning LANE components to the major ATM interface and its subinterfaces:

•The LECS always runs on the major ATM interface.

If you assign any other component to the major interface, it is identical to assigning that component to the 0 subinterface.

•Configure the LES/BUS and the LEC of the same ELAN on the same subinterface.

–You cannot configure LECs of two different ELANs on the same subinterface.

–You cannot configure LESs/BUSs of two different ELANs on the same subinterface.

Note On the switch router, you can configure LAN components only on the route processor interface or on one of its subinterfaces.

Configuring LANE Router and LAN Switch Requirements

You must manually configure QSAAL and ILMI signaling PVCs on routers and edge LAN switches to run LANE.

Note These PVCs are configured automatically on the switch router.

At least one switch router is required to run LANE. For example, you cannot run LANE on routers connected back-to-back.

Configuring a LEC

This section describes how to configure a LANE client connection from a remote switch router to the route processor of a local switch. This connection allows you to configure the switch router remotely.

Note This connection is for switch management only.

Perform these steps:

 
Command
Purpose

Step 1

Switch> enable

Enters privileged EXEC mode.

Step 2

Switch# configure terminal

Switch(config)#

Enters global configuration mode.

Step 3

Switch(config)# interface atm 0.subinterface [multipoint]

Switch(config-subif)#

Selects the route processor subinterface.

Note It is recommended that you configure LECs on subinterfaces (for example, atm 0.1), not main interfaces (for, example, atm 0).

 

Step 4

Switch(config-subif)# lane client-atm-address atm-address-template

Specifies an ATM address (and overrides the automatic ATM address assigned to the LANE client).

Step 5

Switch(config-subif)# lane client ethernet elan-name

Configures a LANE client on the specified subinterface.

Step 6

Switch(config-subif)# end

Switch#

Returns to privileged EXEC mode.

For examples of these commands, see the " LANE Configuration Examples" section at the end of this chapter.

Configuring the LECS

This section describes how to configure the LECS, and includes the following procedures:

• Configuring the ATM Address of the LECS

• Configuring the LECS Database

You must configure the ATM address of the LECS on the switch router.

Configuring the ATM Address of the LECS

The switch router comes with a unique default prefix. To see the default prefix, enter the show lane default atm address command. You can use the default prefix or assign a new one. If you want to use the default prefix, skip this section and proceed to the next section.

This section describes how to change the default prefix and configure a new one. All attached LANE entities use the prefix to create their own ATM network service access point (NSAP) addresses.

Perform these steps:

 
Command
Purpose

Step 1

Switch> enable

Switch#

Enters privileged EXEC mode.

Step 2

Switch# configure terminal

Switch(config)#

Enters global configuration mode.

Step 3

Switch(config)# interface atm 0

Selects the ATM interface on the route processor.

Step 4

Switch(config)# atm lecs-address lecsaddress

Configures the LECS address on the switch router.

Step 5

Switch(config)# atm lecs-address-default address [sequence#]

Configures a redundant LECS address and sequence number for the entire switch. The sequence number specifies the order of the address in the LECS address table. If you do not specify a sequence number, the addresses are used in the order entered.

Step 6

Switch(config)# atm address address

Configures a new ATM address.

Step 7

Switch(config)# no atm address address

Disables the old default ATM address.

Note Enter the show atm addresses command to display the default ATM addresses.

 

For examples of these commands, see the " LANE Configuration Examples" section at the end of this chapter.

Configuring the LECS Database

Perform these steps:

 
Command
Purpose

Step 1

Switch> enable

Enters privileged EXEC mode.

Step 2

Switch# configure terminal

Switch(config)#

Enters global configuration mode.

Step 3

Switch(config)# lane database database-name

Creates a named database for the LECS.

Step 4

Switch(lane-config-database)# name elan-name server-atm-address atm-address

In the configuration database, binds the name of the ELAN to the ATM address of the LES.

Note Enter the show lane default-atm-address command for the ATM address of the server for the ELAN.

 

Step 5

Switch(config)# name elan-name server-atm-address address index n

Specifies redundant LESs/BUSs, or simple server replication. Enter the command for each LES address for the same ELAN. The index determines the priority. Zero (0) is the highest priority.

Step 6

Switch(lane-config-database)# default-name elan-name

In the configuration database, assigns a default ELAN name for the LECs to join without specifying an ELAN name in the LEC configurations.

Step 7

Switch(lane-config-database)# end

Switch#

Returns to privileged EXEC mode.

For examples of these commands, see the " LANE Configuration Examples" section at the end of this chapter.

Configuring the LES/BUS

In Cisco's implementation of LANE, the LES and BUS are treated as one LANE component. You configure the LES and BUS together as one component (the LES/BUS), instead of two separate LANE components.

Perform these steps:

 
Command
Purpose

Step 1

Switch> enable

Enters privileged EXEC mode.

Step 2

Switch# configure terminal

Switch(config)#

Enters global configuration mode.

Step 3

Switch(config)# interface ethernet 0[.subinterface [multipoint]]

Switch(config-if)#

Specifies the subinterface for the first ELAN.

Step 4

Switch(config-if)# lane server-bus ethernet elan-name1

Enables a LES/BUS for the first ELAN.

Step 5

Switch(config-if)# ip address address mask

Assigns an IP address to the subinterface.

Step 6

Switch(config-if)# end

Switch#

Returns to privileged EXEC mode.

LANE Configuration Examples

The following examples show how to configure one Cisco 7505 router, one switch router, and one Catalyst 5500 switch for a single ELAN.

The switch router contains the LECS, LES, and BUS, and a LEC. The remaining router and Catalyst 5500 switch each contain an LEC for the ELAN. This example uses all LANE default settings. For example, it does not explicitly set ATM addresses for the different LANE components that are collocated on the switch router. Membership in this LAN is not restricted (see Figure 4-1).

Figure 4-1 Single ELAN Example Network

Switch Router 

ATM_Switch# show lane default-atm-addresses

interface ATM0:

LANE Client:        47.00918100000000E04FACB401.00E04FACB402.**

LANE Server:        47.00918100000000E04FACB401.00E04FACB403.**

LANE Bus:           47.00918100000000E04FACB401.00E04FACB404.**

LANE Config Server: 47.00918100000000E04FACB401.00E04FACB405.00

note: ** is the subinterface number byte in hex


ATM_Switch# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

ATM_Switch(config)# atm lecs-address-default 47.00918100000000E04FACB401.00E04FACB405.00

ATM_Switch(config)# end

ATM_Switch# copy system:running-config nvram:startup-config

Building configuration...

[OK]

ATM_Switch# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

ATM_Switch(config)# lane database eng_dbase

ATM_Switch(lane-config-database)# name eng_elan server-atm-address 
47.00918100000000E04FACB401.00E04FACB403.01 

ATM_Switch(lane-config-database)# default-name eng_elan

ATM_Switch(lane-config-database)# end

ATM_Switch# show lane database


LANE Config Server database table 'eng_dbase'

default elan: eng_elan

elan 'eng_elan': un-restricted

  server 47.00918100000000E04FACB401.00E04FACB403.01 (prio 0)


ATM_Switch# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

ATM_Switch(config)# interface atm 0

ATM_Switch(config-if)# lane config database eng_dbase

ATM_Switch(config-if)# lane config auto-config-atm-address

ATM_Switch(config-if)# end

ATM_Switch# show lane config

LE Config Server ATM0 config table: eng_dbase

Admin: up  State: operational

LECS Mastership State: active master

list of global LECS addresses (42 seconds to update):

47.00918100000000E04FACB401.00E04FACB405.00 

ATM Address of this LECS: 47.00918100000000E04FACB401.00E04FACB405.00 (auto)

cumulative total number of unrecognized packets received so far: 0

cumulative total number of config requests received so far: 0

cumulative total number of config failures so far: 0


ATM_Switch# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

ATM_Switch(config)# interface atm 0.1 multipoint

ATM_Switch(config-subif)# lane server-bus ethernet eng_elan

ATM_Switch(config-subif)# ip address 172.16.0.4 255.255.0.0

ATM_Switch(config-subif)# end

ATM_Switch# show lane

LE Config Server ATM0 config table: eng_dbase

Admin: up  State: operational

LECS Mastership State: active master

list of global LECS addresses (46 seconds to update):

47.00918100000000E04FACB401.00E04FACB405.00 

ATM Address of this LECS: 47.00918100000000E04FACB401.00E04FACB405.00 (auto)

 vcd  rxCnt  txCnt  callingParty

  82      0      0  47.00918100000000E04FACB401.00E04FACB403.01 LES eng_elan 0 active

cumulative total number of unrecognized packets received so far: 0

cumulative total number of config requests received so far: 0

cumulative total number of config failures so far: 0


LE Server ATM0.1  ELAN name: eng_elan  Admin: up  State: operational

type: ethernet         Max Frame Size: 1516

ATM address: 47.00918100000000E04FACB401.00E04FACB403.01

LECS used: 47.00918100000000E04FACB401.00E04FACB405.00 connected, vcd 81


LE BUS ATM0.1  ELAN name: eng_elan  Admin: up  State: operational

type: ethernet         Max Frame Size: 1516

ATM address: 47.00918100000000E04FACB401.00E04FACB404.01


ATM_Switch# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

ATM_Switch(config)# interface atm 0.1 multipoint

ATM_Switch(config-subif)# lane client ethernet eng_elan

ATM_Switch(config-subif)# end

ATM_Switch# show lane client

LE Client ATM0.1  ELAN name: eng_elan  Admin: up  State: operational

Client ID: 1                 LEC up for 30 seconds 

ELAN ID: 0

Join Attempt: 1              

HW Address: 00e0.4fac.b402   Type: ethernet		Max Frame Size: 1516            

ATM Address: 47.00918100000000E04FACB401.00E04FACB402.01


 VCD  rxFrames  txFrames  Type       ATM Address

   0         0         0  configure  47.00918100000000E04FACB401.00E04FACB405.00

  87         1         2  direct     47.00918100000000E04FACB401.00E04FACB403.01

  90         1         0  distribute 47.00918100000000E04FACB401.00E04FACB403.01

  91         0         1  send       47.00918100000000E04FACB401.00E04FACB404.01

  94         0         0  forward    47.00918100000000E04FACB401.00E04FACB404.01


ATM_Switch# copy system:running-config nvram:startup-config

Building configuration...

[OK]

ATM_Switch#

Router 1 

router1# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

router1(config)# interface atm 3/0

router1(config-if)# atm pvc 1 0 5 qsaal

router1(config-if)# atm pvc 2 0 16 ilmi

router1(config-if)# interface atm 3/0.1 multipoint

router1(config-subif)# ip address 172.16.0.1 255.255.0.0

router1(config-subif)# lane client ethernet eng_elan

router1(config-subif)# end

router1# more system:running-config

Building configuration...


Current configuration:

!

version 12.0


<Information deleted>

!

interface ATM3/0

 no ip address

 atm pvc 1 0 5 qsaal

 atm pvc 2 0 16 ilmi

!

interface ATM3/0.1 multipoint

 lane client ethernet eng_elan

!

<Information deleted>

!

end


router1# show interface atm 3/0.1

ATM3/0.1 is up, line protocol is up 

  Hardware is cxBus ATM

  MTU 1500 bytes, BW 156250 Kbit, DLY 80 usec, rely 255/255, load 1/255

  Encapsulation ATM-LANE

  ARP type: ARPA, ARP Timeout 04:00:00

router1#

Catalyst 5500 Switch 1 

Switch1> session 4

Trying ATM-4...

Connected to ATM-4.

Escape character is '^]'.

ATM> enable

ATM# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

ATM(config)# interface atm 0

ATM(config-if)# lane server-bus ethernet eng_elan

ATM(config-if)# end

ATM# copy system:running-config nvram:startup-config

Building configuration...

[OK]

ATM# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

ATM(config)# interface atm 0

ATM(config-if)# atm pvc 1 0 5 qsaal

ATM(config-if)# atm pvc 2 0 16 ilmi

ATM(config-if)# end

ATM# 

ATM# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

ATM(config)# interface atm 0.1 multipoint

ATM(config-subif)# lane client ethernet 1 eng_elan

ATM(config-subif)# end

ATM# show lane client

LE Client ATM0.1  ELAN name: eng_elan  Admin: up  State: operational

Client ID: 3                 LEC up for 24 seconds 

Join Attempt: 11             

HW Address: 00e0.4fac.b030   Type: ethernet		Max Frame Size: 1516            VLANID: 1                    	

ATM Address: 47.00918100000000E04FACB401.00E04FACB030.01


 VCD  rxFrames  txFrames  Type       ATM Address

   0         0         0  configure  47.00918100000000E04FACB401.00E04FACB405.00

  27         1        14  direct     47.00918100000000E04FACB401.00E04FACB403.01

  29        13         0  distribute 47.00918100000000E04FACB401.00E04FACB403.01

  30         0        15  send       47.00918100000000E04FACB401.00E04FACB404.01

  31         0         0  forward    47.00918100000000E04FACB401.00E04FACB404.01


ATM# copy system:running-config nvram:startup-config

Building configuration...

[OK]

ATM#

Verifying Connectivity

The following example shows how to use the show lane and ping commands to confirm the connection between the switch router, routers, and LAN switches:

Switch Router 

ATM_Switch# show lane

LE Config Server ATM0 config table: eng_dbase

Admin: up  State: operational

LECS Mastership State: active master

list of global LECS addresses (31 seconds to update):

47.00918100000000E04FACB401.00E04FACB405.00  <-------- me

ATM Address of this LECS: 47.00918100000000E04FACB401.00E04FACB405.00 (auto)

 vcd  rxCnt  txCnt  callingParty

  82      2      2  47.00918100000000E04FACB401.00E04FACB403.01 LES eng_elan 0 active

cumulative total number of unrecognized packets received so far: 0

cumulative total number of config requests received so far: 4

cumulative total number of config failures so far: 0


LE Server ATM0.1  ELAN name: eng_elan  Admin: up  State: operational

type: ethernet         Max Frame Size: 1516

ATM address: 47.00918100000000E04FACB401.00E04FACB403.01

LECS used: 47.00918100000000E04FACB401.00E04FACB405.00 connected, vcd 81

control distribute: vcd 89, 2 members, 2 packets


proxy/ (ST: Init, Conn, Waiting, Adding, Joined, Operational, Reject, Term)

lecid ST vcd    pkts Hardware Addr  ATM Address

   1  O   88       2 00e0.4fac.b402 47.00918100000000E04FACB401.00E04FACB402.01

   2  O   96       2 0080.1c93.8060 47.00918100000000E04FACB401.00801C938060.01


LE BUS ATM0.1  ELAN name: eng_elan  Admin: up  State: operational

type: ethernet         Max Frame Size: 1516

ATM address: 47.00918100000000E04FACB401.00E04FACB404.01

data forward: vcd 93, 2 members, 95 packets, 0 unicasts


lecid  vcd     pkts   ATM Address

    1   92       95 47.00918100000000E04FACB401.00E04FACB402.01

    2   97       42 47.00918100000000E04FACB401.00801C938060.01


LE Client ATM0.1  ELAN name: eng_elan  Admin: up  State: operational

Client ID: 1                 LEC up for 1 hour 34 minutes 46 seconds 

ELAN ID: 0

Join Attempt: 1              

HW Address: 00e0.4fac.b402   Type: ethernet		Max Frame Size: 1516            

ATM Address: 47.00918100000000E04FACB401.00E04FACB402.01


 VCD  rxFrames  txFrames  Type       ATM Address

   0         0         0  configure  47.00918100000000E04FACB401.00E04FACB405.00

  87         1         2  direct     47.00918100000000E04FACB401.00E04FACB403.01

  90         2         0  distribute 47.00918100000000E04FACB401.00E04FACB403.01

  91         0        95  send       47.00918100000000E04FACB401.00E04FACB404.01

  94        42         0  forward    47.00918100000000E04FACB401.00E04FACB404.01


ATM_Switch# ping 172.16.0.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.0.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/202/1000 ms

ATM_Switch# ping 172.16.0.3

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.0.2, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/202/1000 ms

ATM_Switch#

Confirming Connectivity Between the Switch Router and the Routers

The following example shows how to use the ping command to confirm the connection between the switch router and routers: 

ATM_Switch# ping 172.16.0.1

 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.0.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/202/1000 
ms

ATM_Switch# ping 172.16.0.3

 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.0.3, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/202/1000 
ms

Displaying the LANE Client Configuration on the Switch Router

The following example shows the show lane client command display for the Ethernet LANE client in the switch router: 

ATM_Switch# show lane client

LE Client ATM0.1  ELAN name: eng  Admin: up  State: operational

Client ID: 3                 LEC up for 4 minutes 58 seconds 

Join Attempt: 1              

HW Address: 0060.3e7b.2002   Type: ethernet             Max Frame Size: 1516            

ATM Address: 47.00918100000000603E7B2001.00603E7B2002.01

 

 VCD  rxFrames  txFrames  Type       ATM Address

   0         0         0  configure  47.00918100000000603E7B2001.00000C407575.00

  52         1         4  direct     47.00918100000000603E7B2001.00000C407573.01

  53         9         0  distribute 47.00918100000000603E7B2001.00000C407573.01

  54         0        13  send       47.00918100000000603E7B2001.00000C407574.01

  55        19         0  forward    47.00918100000000603E7B2001.00000C407574.01

  56        11        10  data       47.00918100000000603E7B2001.00000C407572.01

  57         6         5  data       47.00918100000000603E7B2001.00000C407C02.02

 

Switch#