All Cisco-Network Study Notes: Configure Acquisition Processes

Configure Acquisition Processes

Once connectivity has been configured amid the about-face and a avenue processor, you charge also

configure routing. Routes are paths to abroad networks accepted on the bounded avenue processor,

along with metrics for aisle costs and the addresses of next-hop avenue processors. In this fashion,

a router easily off packets destined for a alien arrangement to a adjoining router who is closer

to the destination. Routers are acclimated by end-user accessories back the destination is not absorbed to

the bounded arrangement (VLAN).

A avenue processor keeps a bounded table of accepted routes, metrics, interfaces, and neighboring

routers. The table entries can be acquired from changeless avenue entries that are manually configured

or from activating acquisition protocols that run on the router. Activating acquisition protocols

InterVLAN Acquisition Agreement 255

communicate with added routers active the aforementioned protocols so that optimal routes can be

determined and advertised in real-time.

NOTE Acquisition and acquisition protocols are alone briefly discussed in this section. For added detailed

information, accredit to the Interconnecting Cisco Arrangement Accessories (ICND) and Building Scalable

Cisco Networks (BSCN) courses or advance books, in accession to the Cisco CCNP Acquisition Exam

Certification Guide from Cisco Press.

To configure activating acquisition on a avenue processor, use the afterward IOS commands:

Router(config)# ip routing

Router(config)# router ip-routing-protocol

Router(config-router)# arrangement ip-network-number

...

The above-mentioned arrangement of commands configures IP routing. First, IP acquisition charge be enabled

with the ip acquisition command. This command is usually enabled by default. A acquisition protocol

process charge be configured with the router command. Several acquisition protocols are available

for IP—Interior Aperture Acquisition Agreement (IGRP), Enhanced IGRP (EIGRP), Routing

Information Agreement (RIP), and Open Shortest Aisle First (OSPF), for example. The routing

protocol configured on a router charge be identical to acquisition protocols configured on

neighboring routers routes to be exchanged and determined. Some acquisition protocols require

additional arguments to ascertain action numbers or free arrangement numbers.

Further agreement is all-important to acquaint the acquisition agreement which networks to acquaint and

which interfaces should be used. This action is done appliance the arrangement command. Classful

(Class A, B, or C) networks are defined so that acquisition advertisements can be beatific out

concerning alone these anon affiliated networks. As well, the acquisition agreement will become

active on all interfaces assigned to anniversary defined network. Advertisements will be beatific and

received on these interfaces.

Additional InterVLAN Acquisition Configurations

Once a avenue processor has been configured for interVLAN routing, end-user stations can use

the processor. Normally, an end-user accessory knows alone about its bounded subnet and can

communicate alone with stations on the bounded arrangement or VLAN. To ability accession base on a

different VLAN, packets charge be forwarded to a router. Therefore, anniversary end-user accessory should

be configured with the router’s IP abode on the bounded VLAN. This agreement is accepted as

a absence gateway.

In addition, a about-face additionally needs to accept a router’s abode configured. Consider the case when

an ambassador needs to authorize a Telnet affair with a alien switch. Perhaps the switch

256 Affiliate 7: InterVLAN Routing

has been configured to accelerate logging or Simple Arrangement Administration Agreement (SNMP) trap

information to a abroad server. Unless the about-face has the router’s address, the about-face will be

unable to advanced administration cartage off its bounded administration VLAN.

To configure a absence aperture on an IOS-based switch, use the ip default-gateway ip-address

command. On a CLI-based switch, a absence avenue charge be configured, appliance the following

command:

Switch(enable) set ip avenue absence gateway

Although an IP avenue is configured, the about-face does not run or participate in a acquisition protocol.

This is a distinct changeless avenue that credibility to a absence gateway. The aperture acreage is the IP address

of the router on the bounded administration VLAN. This command can be acclimated several times to

include added routes, if necessary. The absence keyword can be replaced by a destination, which

is an IP arrangement or host abode to be accomplished through a specific aperture address.

Foundation Arbitrary 257

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 7-2 InterVLAN Acquisition Designs

Design Features

Multiple Concrete Links One concrete articulation from about-face to alien router per VLAN.

Trunk Articulation Links amid about-face and alien router use trunking (ISL or ATM

LANE) to abutment assorted VLANs.

Integrated Avenue Processor Centralized links amid chip router and about-face backplane; supports

multiple VLANs.

Table 7-3 Types of Chip Avenue Processors

Route

Processor Features

RSM First bearing Catalyst 5000 avenue processor (full about-face module), runs IOS, features

internal block links to about-face backplane, and uses basic VLAN interfaces.

MSFC Second bearing Catalyst 6000/6500 avenue processor (daughter agenda on Supervisor).

Table 7-4 Catalyst About-face Commands for InterVLAN Acquisition Configuration

Command Function

show bore Lists installed about-face modules to appearance route

processor (if available).

session slot-number Opens a Telnet affair to the avenue processor in

switch aperture slot-number.

interface media module/port

ip abode ip-address subnet-mask

no shutdown

Configures and enables concrete interface

(external router).

interface media module/port.subinterface

encapsulation [isl | dot1q] vlan-number

ip abode ip-address subnet-mask

Configures subinterfaces and VLANs on an

Ethernet block interface (external router).

continues

258 Affiliate 7: InterVLAN Routing

interface atm module/port.subinterface multipoint

ip abode ip-address subnet-mask

lane applicant ethernet elan-name

Configures subinterfaces, LECs, and ELANs on

an ATM LANE block interface (external router).

interface vlan vlan-number

ip abode ip-address subnet-mask

no shutdown

Configures and enables basic VLAN interface

on RSM/RSFC.

ip routing

router ip-routing-protocol

network ip-network-number

Configures acquisition agreement action on route

processor.

set ip avenue absence aperture Configures absence aperture on Catalyst switch

(management cartage only).

Table 7-4 Catalyst About-face Commands for InterVLAN Acquisition Agreement (Continued)

Command Function

Q&A 259

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 across or abyss than the exam;

however, the questions are advised to accomplish abiding that you apperceive the answer. Rather than

allowing you to acquire the acknowledgment from clues hidden central the catechism itself, the questions

challenge your compassionate 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 have

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

exam questions on which you attenuated your choices to two options and again guess.

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

1 Which of the afterward modules performs interVLAN routing?

a. Catalyst 5000 Supervisor III

b. Catalyst 5000 RSFC

c. Catalyst 5000 LANE Module

d. Catalyst 5000 Gigabit EtherChannel Module

e. Catalyst 5000 RSM

2 Where can a router be placed in affiliation to switches for interVLAN routing?

_______________________________________________________________________

3 How abounding links are bare to affix a router to four VLANs on a switch?

_______________________________________________________________________

4 What types of links can be acclimated to interconnect switches and an alien router? How

many VLANs can be agitated on each?

_______________________________________________________________________

260 Affiliate 7: InterVLAN Routing

5 Which Catalyst avenue processor bore uses four centralized Gigabit Ethernet links to

interface with the about-face backplane?

______________________________________________________________________

6 What trunking methods can a router support?

______________________________________________________________________

7 Which is better: one articulation per VLAN or a distinct block articulation acknowledging all VLANs? Why?

______________________________________________________________________

8 What is the aberration amid interVLAN acquisition and multilayer switching (MLS)?

______________________________________________________________________

9 What commands are bare to accredit IP abode 10.1.2.247 255.255.0.0 to an RSM

interface for VLAN 72?

______________________________________________________________________

10 What Catalyst commands can be acclimated to locate and again affix to an centralized route

processor?

______________________________________________________________________

Q&A 261

11 What commands can be acclimated to configure IP abode 10.10.10.1 255.0.0.0 on an external

router’s VLAN 101 interface, bold FastEthernet 0/0 is actuality acclimated as a block link?

_______________________________________________________________________

12 What should be configured on a avenue processor to dynamically actuate acquisition paths

to alien networks?

_______________________________________________________________________

13 A router with an ATM LANE bore is acclimated to avenue cartage amid six VLANs located

on anniversary of 10 Catalyst switches. Anniversary about-face has a LANE bore configured for the

matching VLANs and ELANs. All switches are affiliated by an ATM switch. What

LANE apparatus are bare on the router to abutment interVLAN routing? How many

of anniversary basic should be configured?

_______________________________________________________________________

14 If a router is acclimated to avenue amid VLANs, what added advice is bare so that

traffic will absolutely be routed?

_______________________________________________________________________

15 Suppose a router connects four VLANs of a switched network, accouterment interVLAN

routing. If the router is again configured for bridging to abutment non-routable protocols,

how would the arrangement be affected?

_______________________________________________________________________

262 Affiliate 7: InterVLAN Routing

16 A about-face has its sc0 interface configured with an IP abode of 10.10.1.17 255.255.0.0 on

VLAN 10. A router is affiliated to the switched arrangement and has interfaces at 10.10.1.1

and 10.11.1.1. What charge be configured to acquiesce addition affiliated to the about-face console

to ping host 10.11.1.100 on VLAN 11?

______________________________________________________________________

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

Switching Exam:

• Overview of Multilayer Switching—This area outlines an overview of Multilayer

Switching (MLS). Additionally declared are the apparatus that accomplish up MLS and the

concepts of caching and advertisements.

• Configuring Multilayer Switching—This sections deals with how to configure

Multilayer Switching on the assorted arrangement accessories that accomplish up MLS.

• Breeze Masks—This area discusses the appliance of breeze masks, including input

and achievement lists.

• Configuring the Multilayer Switching About-face Engine—This area discusses the

configuration of the About-face Engine in the role of Multilayer Switching.