All Cisco-Network Study Notes: LANE Configuration

LANE Configuration 269

This area discusses the procedures for configuring the assorted LANE apparatus on Cisco

Catalyst switches. The adjustment that the apparatus are configured is important because each

component is abased aloft another.

On Cisco ATM devices, ELANs are configured on ATM subinterfaces. This configuration

makes it attainable to abutment abounding ELANs over a distinct ATM link. As well, the LANE

components all-important for a specific ELAN charge be configured on the corresponding subinterface

for that ELAN (ATM 0.1, ATM 0.2, and so on). The LECS, because it exists for all ELANs,

must be configured on the aloft ATM interface (ATM 0).

The archetype from Figure 6-4 is apparent afresh in Figure 6-5, forth with ATM interface and

subinterface numbers. Apprehension that anniversary LEC charge be configured on a altered subinterface. The

LANE Agreement 221

LES/BUS pairs charge be configured on the subinterfaces area their corresponding ELANs are

present. The LECS charge be configured on an ATM aloft interface because it keeps a database

for all ELANs.

Figure 6-5 An Archetype LANE Arrangement Showing ATM Interfaces

NSAP addresses on Cisco accessories can be either manually configured or automatically

generated. Automated bearing is best generally used, because it offers attainable agreement and

use. Anamnesis that an NSAP abode is fabricated up of a 13-byte prefix, a 6-byte ESI, and a 1-byte

selector. The ATM about-face provides the prefix value. The ESI amount comes from the MAC

address assigned to the accurate LANE bore and ATM interface on the Catalyst switch. The

selector byte comes from the ATM bend accessory itself and is according to the ATM subinterface

number.

The LANE apparatus are additionally accustomed automated NSAP addresses, according to the scheme

shown in Table 6-3. You should thoroughly accept how these addresses are generated. You

might acquisition it advantageous in some situations to be able to assignment backwards and locate a LANE

component accustomed its NSAP address.

Table 6-3 Automated NSAP Abode Bearing for LANE components

LANE Basal Prefix ESI Selector

LEC From ATM about-face MAC abode ATM subinterface

LES From ATM about-face MAC abode + 1 ATM subinterface

BUS From ATM about-face MAC abode + 2 ATM subinterface

LECS From ATM about-face MAC abode + 3 .00

atm0

Catalyst A

atm0

atm 0.1: LEC1, LES/BUS 1

atm 0.2: LEC2

atm 0: LECS

atm 0.1: LEC1

atm 0.2: LEC2

Catalyst B

atm 0.1: LEC1

atm 0.2: LEC2, LES/BUS 2

Catalyst C

222 Affiliate 6: Trunking with ATM LANE

Even afore configuration, seeing a advertisement of the automatically generated NSAP addresses on

any LANE-capable about-face bore is possible. For example, because configuring the complete

LECS NSAP abode into the ATM switches is necessary, you can acquisition that abode by using

the appearance lane absence command on the LANE bore area the LECS will be configured.

Refer to the appearance lane absence command achievement in Archetype 6-1 and apprehension how the NSAP

addresses for the LANE apparatus chase the arrangement in Table 6-3. (All LANE component

addresses are apparent with this command, alike if none of the apparatus are configured on the

switch. You can now see what the automatically generated NSAP addresses would be if the

components were configured.)

Notice that all LANE apparatus are listed with their automatically generated NSAP

addresses. To accommodate animal readability, the addresses are achievement with dots amid the

NSAP components. A dot appears afterwards the leftmost byte of the prefix, at the end of the prefix,

and at the end of the ESI (MAC address). Although an abode is a continued cord of hex digits, it

is calmly burst bottomward into prefix, ESI, and selector portions.

NOTE The LANE bore on a Cisco Catalyst about-face is not attainable from the accustomed switch

command-line interface (CLI)-based user interface. Instead, the LANE bore provides an

IOS-based interface that charge be accessed through the affair about-face command. Think of this

command as a Telnet affair that moves you from the about-face CLI to addition device’s IOS

interface. The LANE bore and the about-face administrator allotment a accepted backplane but have

independent user interfaces.

NOTE The affair command requires an altercation that specifies the bore cardinal area the LANE

module is amid in the chassis. For example, if a LANE bore occupies aperture 2 in a Catalyst

5500 switch, affair 2 would accessible a affair to the LANE module’s IOS. From that point

on, IOS commands are acclimated to display, debug, and configure the LANE module. Once

configuration changes accept been made, you charge archetype the alive agreement to

NVRAM (copy run start).

Example 6-1 appearance lane absence Achievement Displays NSAP Addresses for LANE Components

CatalystA_ATM#show lane default

interface ATM0:

LANE Client: 47.00001606288000300000000F.0050A28D5880.**

LANE Server: 47.00001606288000300000000F.0050A28D5881.**

LANE Bus: 47.00001606288000300000000F.0050A28D5882.**

LANE Config Server: 47.00001606288000300000000F.0050A28D5883.00

note: ** is the subinterface cardinal byte in hex

CatalystA_ATM#

LANE Agreement 223

Configuring the LES and BUS

The LES and BUS for an ELAN charge be amid on the aforementioned accessory and charge use the same

ATM subinterface. To configure both LES and BUS apparatus for an ELAN, use the

following commands:

ATM(Config)# interface atm number.subint multipoint

ATM(Config-subif)# lane server-bus ethernet elan-name

The subinterface cardinal acclimated can be arbitrarily chosen. Remember that anniversary subinterface (or

each ELAN) is anecdotal from the others. Therefore, you can configure a altered LES/BUS

pair on one or added subinterfaces. Anniversary brace will achieve alone for its assigned ELAN. The elanname

parameter is a altercation cord (case sensitive) that identifies the name of the ELAN. This name

must be authentic the aforementioned in all LANE components.

To apparatus SSRP for bombastic LES/BUS apparatus in an ELAN, use the preceding

commands on added LANE modules to actualize the bombastic pieces. All of the bombastic LES/

BUS pairs will be configured into the LECS database.

Configuring the LECS

The LECS is configured on a aloft ATM interface, not on a subinterface. Aboriginal you charge build

the LECS database of ELANs and their associated LES NSAP addresses. Configure the LECS

database with the afterward commands:

ATM(Config)# lane database database-name

ATM(lane-config-database)# name elan1-name server-atm-address les1-nsap-address

ATM(lane-config-database)# name elan2-name server-atm-address les2-nsap-address

ATM(lane-config-database)# name …

The database-name altercation is a altercation cord that identifies the LECS database as a whole.

Several LECS databases can be defined, anniversary with a altered name string, and activated to LECS

components on alone ATM aloft interfaces. Usually, one LECS and one database are

sufficient on a LANE module.

Each ELAN in the LANE arrangement charge be authentic with a distinct name database command

using the NSAP abode of that ELAN’s LES. Remember that you can acquisition the NSAP address

of the LES on a about-face appliance the appearance lane absence command.

To apparatus SSRP for bombastic LES/BUS entities, use the aforementioned commands as above, with

multiple NSAP addresses for anniversary ELAN. For example, you can use the afterward commands:

ATM(Config)# lane database database-name

ATM(lane-config-database)# name elan1-name server-atm-address les1-nsap-address

ATM(lane-config-database)# name elan1-name server-atm-address les2-nsap-address

ATM(lane-config-database)# name elan2-name server-atm-address les1-nsap-address

ATM(lane-config-database)# name elan2-name server-atm-address les2-nsap-address

ATM(lane-config-database)# name …

224 Affiliate 6: Trunking with ATM LANE

After the database has been built, the LECS charge be enabled on the ATM aloft interface. This

is done with the afterward commands:

ATM(Config)# interface atm number

ATM(Config-if)# lane config database database-name

ATM(Config-if)# lane config auto-config-atm-address

The LECS database that was aboriginal congenital is now referenced by its name and apprenticed to the LECS

process. The auto-config-atm-address advantage is acclimated to acquaint the LANE bore to use the

automatically generated NSAP addresses for the LECS component. The LECS NSAP address

must now be configured into the ATM switches so that added LANE apparatus can

automatically retrieve the LECS abode from the switches via ILMI.

To apparatus SSRP for bombastic LECS entities, aboriginal actualize two or added LECS components

on altered LANE modules. Because the LECS database specifies the adjustment of added redundant

components to use, the LECS database charge be configured analogously on all LECS machines.

Then the NSAP addresses of the bombastic LECS apparatus can be configured into the ATM

switch.

Configuring Anniversary LEC

You charge configure a LEC on anniversary accessory area required. One LEC is all-important for each

ELAN that a accessory participates in. The LEC agreement additionally specifies which VLAN the

ELAN will be bridged to on the switch.

Each LEC is configured on a altered ATM subinterface, appliance the afterward commands:

ATM(Config)# interface atm number.subint multipoint

ATM(Config-subif)# lane applicant ethernet vlan-num elan-name

The vlan-num altercation references an absolute VLAN cardinal on the bounded switch. The elanname

argument references the name of an absolute ELAN on the bounded LANE module. The two

are afresh bridged on the LANE bore and become a distinct advertisement domain.

Viewing the LANE Configuration

The agreement of anniversary alone LANE basal is adequately straightforward. However,

because anniversary basal can be placed on a abstracted device, free if all of the

components are communicating and operating appropriately can be difficult. Catalyst LANE

modules action a cardinal of commands that can be acclimated to affectation and alter LANE

configurations and status.

Viewing Absence NSAP Addresses

To appearance the absence NSAP addresses for the bounded LANE module, use the appearance lane default

command as approved ahead in Archetype 6-1.

LANE Agreement 225

Viewing LES Status

To appearance the cachet of an LES, use the appearance lane server command on the LES machine.

Example 6-2 demonstrates this command for a about-face that is the LECS for two ELANs:

The black curve in Archetype 6-2 appearance two LES components, one on interface ATM 0.1 and one

on ATM 0.2. Both LESs are apparent to be absolutely functional, listed in the operational state. Also

note that the ELAN name is accustomed for anniversary LES.

Viewing BUS Status

To appearance the cachet of a BUS, use the appearance lane bus command. Archetype 6-3 demonstrates this

command on the aforementioned about-face acclimated in Archetype 6-2. This about-face is configured as the LES/BUS

for two ELANs:

Example 6-2 appearance lane server Achievement Displays LES Status

CatalystA_ATM#show lane server

LE Server ATM0.1 ELAN name: lan1 Admin: up State: operational

type: ethernet Max Anatomy Size: 1516

ATM address: 47.00001606288000300000000F.0050A28D5881.01

LECS used: 47.00001606288000300000000F.0050A28D5883.00 connected, vcd 1460

control distribute: vcd 1485, 2 members, 479995 packets

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

lecid ST vcd pkts Hardware Addr ATM Address

1P O 1474 479994 0050.a28d.5880 47.00001606288000300000000F.0050A28D5880.0B

2P O 1505 3 0090.6f7a.1c80 47.00001606288000100000000F.00906F7A1C80.01

LE Server ATM0.2 ELAN name: lan2 Admin: up State: operational

type: ethernet Max Anatomy Size: 1516

ATM address: 47.00001606288000300000000F.0050A28D5881.02

LECS used: 47.00001606288000300000000F.0050A28D5883.00 connected, vcd 1415

control distribute: vcd 1427, 2 members, 2 packets

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

lecid ST vcd pkts Hardware Addr ATM Address

1P O 1397 2 0050.a28d.5880 47.00001606288000300000000F.0050A28D5880.0C

2P O 1511 2 0090.6f7a.1c80 47.00001606288000100000000F.00906F7A1C80.02

Example 6-3 appearance lane bus Achievement Displays BUS Status

CatalystA_ATM#show lane bus

LE BUS ATM0.1 ELAN name: lan1 Admin: up State: operational

type: ethernet Max Anatomy Size: 1516

ATM address: 47.00001606288000300000000F.0050A28D5882.01

data forward: vcd 1499, 2 members, 523298 packets, 0 unicasts

continues

226 Affiliate 6: Trunking with ATM LANE

The black curve in Archetype 6-3 appearance two BUS apparatus on interfaces ATM 0.1 and

ATM 0.2. Both BUSs are in the operational accompaniment and are listed with their corresponding ELAN

names. Anniversary BUS is additionally apparent with a breakdown of packet forwarding action to individual

LECs aural the ELAN.

Viewing the LECS Database

To appearance the accepted LECS database, use the appearance lane database command on the LECS

machine. Archetype 6-4 demonstrates the achievement generated by this command.

The black curve in the achievement in Archetype 6-4 appearance that the LECS has a database called

company_db, which contains a cardinal of LES and ELAN entries. The LECS is assigned to

interface ATM0 (the aloft concrete interface). The capacity of the database are afresh listed by

ELAN, anniversary absolute a distinct LES. All LESs are in the alive state, and are listed with their

complete NSAP addresses.

Viewing LEC Status

To appearance the cachet of a LANE Client, use the appearance lane applicant command as approved in

Example 6-5 for a about-face with two LECs (two ELANs).

lecid vcd pkts ATM Address

1 1489 505572 47.00001606288000300000000F.0050A28D5880.0B

2 1506 17726 47.00001606288000100000000F.00906F7A1C80.01

LE BUS ATM0.2 ELAN name: lan2 Admin: up State: operational

type: ethernet Max Anatomy Size: 1516

ATM address: 47.00001606288000300000000F.0050A28D5882.02

data forward: vcd 1451, 2 members, 0 packets, 0 unicasts

lecid vcd pkts ATM Address

1 1433 0 47.00001606288000300000000F.0050A28D5880.0C

2 1512 0 47.00001606288000100000000F.00906F7A1C80.02

Example 6-4 appearance lane database Achievement Displays the LECS Database Contents

CatalystA_ATM#show lane database

LANE Config Server database table 'company_db' apprenticed to interface/s: ATM0

no absence elan

elan 'lan1': un-restricted

server 47.00001606288000300000000F.0050A28D5881.01 (prio 0) active

elan 'lan2': un-restricted

server 47.00001606288000300000000F.0050A28D5881.02 (prio 0) active

Example 6-3 appearance lane bus Achievement Displays BUS Cachet (Continued)

LANE Agreement 227

Each LEC that is present on the bounded about-face is listed with the appearance lane applicant command. The

shaded curve appearance that there are two LECs on this switch—one assigned to interface ATM 0.11

and one to ATM 0.12. Both are up and operational. The best important advice accustomed here

are the LEC uptimes and accompany attempts. Here, both LECs accept been up for a little added than 11

days. Back a LEC is not operating properly, this command will appearance that the LEC is bottomward and

how abounding attempts the LEC has fabricated to accompany the ELAN. A timer amount will additionally be apparent that

tells back the LEC will try to accompany the ELAN again.

Example 6-5 appearance lane applicant Achievement Displays the LEC Status

CatalystA_ATM#show lane client

LE Applicant ATM0.11 ELAN name: lan1 Admin: up State: operational

Client ID: 1 LEC up for 11 canicule 2 hours 43 account 9 seconds

Join Attempt: 20

HW Address: 0050.a28d.5880 Type: ethernet Max Anatomy Size: 1516

VLANID: 1

ATM Address: 47.00001606288000300000000F.0050A28D5880.0B

VCD rxFrames txFrames Blazon ATM Address

0 0 0 configure

47.00001606288000300000000F.0050A28D5883.00

1477 1 480139 absolute 47.00001606288000300000000F.0050A28D5881.01

1481 480140 0 distribute

47.00001606288000300000000F.0050A28D5881.01

1491 0 505675 accelerate 47.00001606288000300000000F.0050A28D5882.01

1495 17729 0 advanced 47.00001606288000300000000F.0050A28D5882.01

LE Applicant ATM0.12 ELAN name: lan2 Admin: up State: operational

Client ID: 1 LEC up for 11 canicule 2 hours 43 account 12 seconds

Join Attempt: 19

HW Address: 0050.a28d.5880 Type: ethernet Max Anatomy Size: 1516

VLANID: 2

ATM Address: 47.00001606288000300000000F.0050A28D5880.0C

VCD rxFrames txFrames Blazon ATM Address

0 0 0 configure

47.00001606288000300000000F.0050A28D5883.00

1403 1 2 direct

47.00001606288000300000000F.0050A28D5881.02

1421 2 0 distribute

47.00001606288000300000000F.0050A28D5881.02

1439 0 0 send

47.00001606288000300000000F.0050A28D5882.02

1445 0 0 forward

47.00001606288000300000000F.0050A28D5882.02

228 Affiliate 6: Trunking with ATM LANE

Foundation Summary

The Foundation Arbitrary is a accumulating of tables and abstracts that accommodate a acceptable review

of abounding key concepts in this chapter. For those of you already adequate with the capacity in

this chapter, this arbitrary could advice you anamnesis a few details. For those of you who aloof read

this chapter, this analysis should advice coalesce some key facts. For any of you accomplishing your final

prep afore the exam, these tables and abstracts will hopefully be a acceptable way to analysis the

day afore the exam.

Table 6-4 ATM Reference Model

OSI Reference Model ATM Reference Model

Layer 7 (application) Higher Layers

Layer 6 (presentation)

Layer 5 (session)

Layer 4 (transport)

Layer 3 (network)

Layer 2 (data link) ATM Adaptation Layers (AAL)

ATM Layer

Layer 1 (physical) ATM Concrete Layer

Table 6-5 ATM Adaptation Layers

ATM

Adaptation Layer Function

AAL1 Supports connection-oriented casework that can claiming busy band circuits.

AAL1 requires timing synchronization amid antecedent and destination,

allowing the carriage of real-time streams like articulation and video. Abstracts is

sampled and put into corpuscle payloads, forth with arrangement information, before

transmission.

AAL2 Supports connection-oriented casework for capricious bit amount (VBR) applications.

AAL3/4 Supports both connection-oriented and connectionless services. AAL3/4 was

designed for use with Switched Multimegabit Abstracts Service (SMDS). Abstracts is

segmented into corpuscle payloads, while CRC absurdity advice is added.

AAL5 Supports both connection-oriented and connectionless services. Non-SMDS

data, like TCP/IP over ATM and LANE, is transported in arrangement with simple

segmentation. A CRC amount is added to the end of the pre-segmented frame.

Foundation Arbitrary 229

Table 6-6 Types of ATM Circuits

ATM Ambit Blazon Function

PVC Permanent Basal Circuit—manually configured amid endpoints.

SVC Switched Basal Circuit—dynamically configured amid endpoints.

Point-to-point Ambit amid absolutely two endpoints.

Point-to-multipoint Ambit from one endpoint to assorted endpoints.

VCC Basal Channel Connection—ATM ambit congenital amid two endpoints.

VP Basal Path—a array of basal channels.

Transmission Path A array of basal paths.

Table 6-7 Apparatus of a 20-Byte ATM NSAP Address

NSAP

Component Size Function

Prefix 13 bytes Uniquely identifies anniversary ATM switch.

ESI 6 bytes Uniquely identifies accessory absorbed to ATM about-face (MAC address).

Selector 1 byte Identifies action on ATM accessory (ATM subinterface number).

Table 6-8 LANE Components

LANE

Component Function

LEC Provides basal ELAN action on ATM device; bridges ELAN to VLAN.

LES Provides MAC-to-NSAP abode resolution for one ELAN.

BUS Provides advertisement functionality for all audience of one ELAN.

LECS Provides LES addresses and ELAN associates for all audience of all ELANs.

Table 6-9 Arrangement of Communication as a LEC Initializes

Step Activity

1 LEC finds LECS abode (ILMI, etc); LEC contacts LECS for associates and LES NSAP

address.

2 LEC contacts LES;

LEC registers its own MAC and NSAP addresses with LES.

3 LEC contacts BUS via advertisement abode (0xFFFFFFFFFFFF);

BUS adds LEC as a blade bulge on multipoint VC.

4 LEC builds Abstracts Absolute VCCs to added LECs as needed.

230 Affiliate 6: Trunking with ATM LANE

Table 6-10 Automated NSAP Abode Bearing for LANE Components

LANE

Component Prefix ESI Selector

LEC From ATM About-face MAC Abode ATM Subinterface

LES From ATM About-face MAC Abode + 1 ATM Subinterface

BUS From ATM About-face MAC Abode + 2 ATM Subinterface

LECS From ATM About-face MAC Abode + 3 .00

Table 6-11 Arbitrary of Catalyst LANE Agreement Commands

Catalyst Command Function

show lane absence Affectation absence or autoconfigured NSAP addresses for all

LANE apparatus on the switch.

session module-num Accessible a user interface affair with the about-face bore in

slot module-num. This is bare to activate a affair with a

LANE module.

lane server-bus ethernet elan-name Configure LES/BUS brace on an ATM subinterface

(subinterface config mode).

lane database db-name

name elan-name server-atm-address

les-nsap-address

name …

Configure LECS database.

lane config-database db-name

lane config-auto-atm-address

Apply LECS database to an ATM aloft interface

(interface config mode); Configure automated ATM NSAP

addressing for LANE components.

lane applicant ethernet vlan-num elan-name Configure LEC for VLAN cardinal and ELAN name on

ATM subinterface (subinterface config mode).

show lane server Affectation cachet of LES on the switch.

show lane bus Affectation cachet of BUS on the switch.

show lane database Affectation cachet of LECS on the switch.

show lane applicant Affectation cachet of LEC on the switch.

Q&A 231

Q&A

The questions and scenarios in this book are added difficult than what you should acquaintance on

the absolute exam. The questions do not attack to awning added beyond or abyss than the exam;

however they are advised to achieve abiding that you apperceive the answer. Rather than acceptance you to

derive the acknowledgment from clues hidden central the catechism itself, the questions claiming your

understanding and anamnesis of the subject. Questions from the “Do I Apperceive This Already?” quiz

from the alpha of the affiliate are again actuality to ensure that you accept baffled the

chapter’s affair areas. Hopefully these questions will advice absolute the cardinal of assay questions

on which you attenuated your choices to two options and afresh guess.

The answers to these questions can be begin in Appendix A, on folio 477.

1 What is the basal assemblage of ATM data? What is its basal architecture (header, payload, etc.)?

_______________________________________________________________________

2 What action allows an IP packet to be transported aural ATM cells?

_______________________________________________________________________

3 What is an ATM bend device? What Cisco accessories can be used?

_______________________________________________________________________

4 What types of VCs can be congenital with ATM?

_______________________________________________________________________

5 List the bureaucracy of ATM VCs.

_______________________________________________________________________

232 Affiliate 6: Trunking with ATM LANE

6 What blazon of acclamation is acclimated to analyze ATM devices?

______________________________________________________________________

7 What are the three basal apparatus of a NSAP address?

______________________________________________________________________

8 What advice is agitated aural anniversary ATM abstracts assemblage to specify how to get from the

source to the destination?

______________________________________________________________________

9 Name two inherent ATM protocols acclimated by ATM switches to acquaint with other

ATM devices.

______________________________________________________________________

10 What is LANE acclimated for?

______________________________________________________________________

11 Area should the LECS NSAP abode be configured in a LANE network? Area should

the LES NSAP abode be configured?

______________________________________________________________________

Q&A 233

12 What are the anatomic apparatus of LANE?

_______________________________________________________________________

13 What is the aftereffect of a bootless LECS on a LANE network? A bootless LES? A bootless BUS? A

failed LEC?

_______________________________________________________________________

14 Back a LEC initializes, what LANE basal does it acquaintance first? Why?

_______________________________________________________________________

15 What is the aberration amid a VLAN and an ELAN?

_______________________________________________________________________

16 Back is an LE_ARP used?

_______________________________________________________________________

17 The afterward NSAP addresses were acquired from appearance lane default. Match the LANE

components to their NSAP addresses:

47.00001606288000300000000F.0064A28D5EA0.**

47.00001606288000300000000F.0064A28D5EA1.**

47.00001606288000300000000F.0064A28D5EA2.**

47.00001606288000300000000F.0064A28D5EA3.00

18 How abounding of anniversary LANE basal are all-important for LANE operation?

_______________________________________________________________________

234 Affiliate 6: Trunking with ATM LANE

19 A arrangement consists of two Catalyst switches affiliated by an ATM switch. Four VLANs

exist on anniversary Catalyst and are trunked amid all Catalyst switches. How abounding LECS

components are present? How abounding LES components? How abounding BUS components?

How abounding LECs?

______________________________________________________________________

20 Which LANE basal performs bridging amid a VLAN and an ELAN?

______________________________________________________________________

21 Accustomed an NSAP abode of 47.00001606288000300000000F.0064A28D5EA1.0A, what

LANE basal does this represent? On which subinterface of ATM 0 is this assigned?

______________________________________________________________________

22 What NSAP addresses charge be configured into the LECS database?

______________________________________________________________________

23 A LANE database (mylane-db) has already been created on a Catalyst switch. The switch

contains a distinct ATM interface (ATM 0) and subinterfaces ATM 0.1 and ATM 0.2. What

commands can be acclimated to accredit the LECS with this database on the ATM link?

______________________________________________________________________

24 If a about-face supports four VLANs, how abounding LECs will be needed? How abounding ATM

subinterfaces will be required?

______________________________________________________________________

Q&A 235

25 What is SSRP? Which LANE apparatus can be configured for SSRP?

_______________________________________________________________________

26 How abounding ATM subinterfaces are appropriate to abode both an LES and a BUS on a Catalyst

switch?

_______________________________________________________________________

27 What Catalyst about-face command can be acclimated to appearance the accepted cachet of anniversary LANE

component (LECS, LES, BUS, and LEC)?

_______________________________________________________________________

28 Is it attainable to abode all LANE apparatus (LECS, LES, BUS, and LEC) on a single

Catalyst switch? If alone one VLAN is required, what is the minimum cardinal of interfaces

required?

_______________________________________________________________________

236 Affiliate 6: Trunking with ATM LANE

Scenarios

Scenario 6-1

Given the arrangement diagram apparent in Figure 6-6, achieve the afterward exercises:

Figure 6-6 Arrangement Diagram for Book 6-1

1 Choose locations area anniversary of the LANE apparatus can be configured, so that VLANs

101 and 102 accept connectivity beyond the ATM cloud. (Ignore SSRP for this scenario.)

2 Assume the ELANs in this arrangement are called “ELAN101” and “ELAN102”. What

commands are bare to configure a LEC for ELAN 101 on Catalyst A?

3 With the arrangement apparent in Figure 6-5, can a host on Catalyst A VLAN 101 communicate

with a host on Catalyst B VLAN 101? With a host on Catalyst C VLAN 102?

4 A base on Catalyst C VLAN 102 sends a broadcast. Which Catalysts and VLANs will

see the broadcast?

5 Accept Catalyst A is configured with the LECS and Catalyst B is configured with the

LES for ELAN 102. On Catalyst C, appearance lane applicant shows that the LEC for ELAN 102

has not abutting ELAN 102. What are some attainable causes?

6 Accept Catalyst A is the LECS, Catalyst C is the LES/BUS for ELAN 102, and Catalyst

B has a LEC for ELAN 102. A base on Catalyst B tries to ping a base on Catalyst A.

Where is an ARP appeal advertisement apparent first?

atm0

Catalyst A

atm0

Catalyst B

Catalyst C

VLAN 101

VLAN 102

VLAN 101

VLAN 102

(ATM switches

provide LECS

address via ILMI)

Scenario 6-1 237

7 Now accept that back the base on Catalyst A replies, the LEC for ELAN 102 on

Catalyst A alone knows Catalyst B’s LEC 102 MAC address. How does Catalyst A’s LEC

102 acquisition the NSAP abode for Catalyst B’s LEC 102?

8 You now charge to add an added VLAN (103) to alone Catalysts B and C. What steps

should you booty to achieve this?

238 Affiliate 6: Trunking with ATM LANE

Scenarios Answers

Scenario 6-1 Answers

1 The LECS could be placed on either Catalyst A, B, or C. The LES/BUS for ELAN 101

could be placed on either A or B, and the LES/BUS for ELAN 102 could be placed on

either A, B, or C. A LEC for ELAN 101 charge be placed on Catalyst A and B. A LEC for

ELAN 102 charge be placed on all three Catalysts.

2 The commands bare are as follows:

interface atm 0.1 multipoint

lane applicant Ethernet 101 ELAN101

3 A host on Catalyst A VLAN 101 can absolutely acquaint with a host on Catalyst B

VLAN 101. Because VLAN 101 is trunked beyond the ATM billow appliance LANE, end-toend

communication is possible. The aforementioned host on Catalyst A cannot acquaint with a

host on Catalyst C VLAN 102, however. VLANs 101 and 102 are segmented, as are

ELANs 101 and 102. Without a router, hosts cannot allocution beyond the VLANs.

4 Back the base sends the broadcast, the LEC for ELAN 102 on Catalyst C receives it

first. The advertisement is beatific on to the BUS (wherever it is configured) and afresh on to all

three Catalysts because VLAN/ELAN 102 is configured on all switches. VLAN 102 will

be the alone VLAN to accept the advertisement because VLAN 102 is the abuttals of the

broadcast domain.

5 The LEC will not be able to accompany the ELAN if the afterward altitude occur:

The LES NSAP abode has been misconfigured in the LECS database. In that case, the

LEC will acquaintance the LECS and accept the amiss LES address. Because the appropriate

LES can’t be reached, the LEC will not be able to accompany the ELAN.

If the LECS NSAP abode is misconfigured in the ATM switch, the LEC will accept an

incorrect abode via ILMI. Afresh the LEC will never be able to concern a LECS for the

address of the LES.

6 The ARP appeal is accustomed by the LEC for ELAN 102 on Catalyst B aboriginal because it is

the arch amid VLAN 102 (where the base is located) and ELAN 102. The LEC

then assiduously the advertisement on to the BUS on Catalyst C.

7 Because the LEC on Catalyst A doesn’t apperceive the NSAP abode for the LEC on Catalyst

B, it charge concern the LES for ELAN 102 with an LE_ARP request. The LES (located on

Catalyst C) will boldness the MAC abode and acknowledgment the LEC’s NSAP address.

Scenario 6-1 Answers 239

8 First, ascertain VLAN 103 on Catalysts B and C, either manually or by appliance VTP. Afresh add

an access in the LECS database for a LES/BUS in ELAN 103. A LES and BUS for ELAN

103 charge be configured, either on Catalyst B or C. Finally, a LEC bridging VLAN 103 to

ELAN 103 charge be added to both Catalyst B and C area the VLAN exists.

This affiliate covers the afterward capacity that you will charge to adept the CCNP Switching

Exam:

• InterVLAN Acquisition Design—This area covers the attempt and design

possibilities for acquisition amid switched VLANs.

• InterVLAN Acquisition Configuration—This area presents the commands for

configuring interVLAN acquisition on Catalyst switches and assorted avenue processors.