PBR Support for Multiple Tracking Options

(1)

PBR

PBR Sup

Suppo

port fo

rt for M

r M ultiple

ultiple Track

Tracking O

ing Option

ptionss

Th

Thee PBRPBR SupSupporportt forfor MulMultitipleple TrTrackackiningg OptOptioionsns fefeatatureure exextetendsnds ththee cacapabpabililititieiess ofof obobjejectct trtracackinkingg ususiningg Cisco Discovery Protocol (CDP) to allow the policy-based routing (PBR) process to verify object Cisco Discovery Protocol (CDP) to allow the policy-based routing (PBR) process to verify object availability by using additional methods. The verification method can be an Internet Control Message availability by using additional methods. The verification method can be an Internet Control Message Protocol (ICMP) ping, User Datagram Protocol (UDP) ping, or an HTTP GET request.

Protocol (ICMP) ping, User Datagram Protocol (UDP) ping, or an HTTP GET request. Feature History for PBR

Feature History for PBR Support foSupport for Mr M ultiple ultiple TrackiTracki ng Opng Optionstions

Finding Sup

Finding Support Information for Platforms and Cisco IOS Softwaport Information for Platforms and Cisco IOS Softwa re Ire I magesmages Us

Usee CisCiscoco FeFeatatureure NaNavivigatgatoror toto ffinindd ininforformamatitionon aboaboutut plplatatforformm susuppopportrt anandd CisCiscoco IOSIOS sosoftftwawarere imimagagee support. Access Cisco Feature Navigator at

support. Access Cisco Feature Navigator at http://www.cisco.com/go/fnhttp://www.cisco.com/go/fn. You must have an account on. You must have an account on Ci

Ciscsco.o.cocom.m. IfIf yoyouu dodo nonott hahaveve anan acaccocoununtt oror hahaveve foforgrgotottetenn yoyourur ususerernanameme oror papasssswowordrd,, clclicick k CancelCancel atat the login dialog box and follow the instructions that appear.

the login dialog box and follow the instructions that appear.

Information Abou

Information About PBR

t PBR Supp

Support f

ort for M

or M ulti

ultiple

ple Trac

Tracki

king

ng O

Options

ptions

To configure the PBR Support for Multiple Tracking Options feature, you should understand the To configure the PBR Support for Multiple Tracking Options feature, you should understand the following concepts:

following concepts:

•• Object Object TrackTracking, paging, pagee 22

•• PBR Support for MultipPBR Support for Multiple Trackile Tracking Options Featurng Options Feature Design, pagee Design, page22

O

Objec

bject T

t Track

racking

ing

Object tracking is an independent process that monitors objects such as the following: Object tracking is an independent process that monitors objects such as the following:

•• State of the line protocol of an interfaceState of the line protocol of an interface

•• Existence of an entry in the routing tableExistence of an entry in the routing table

•• Results of an IP SLA monitoring operation, such as a pingResults of an IP SLA monitoring operation, such as a ping

Clients such as Hot Standby Router Protocol (HSRP), Virtual Router Redundancy Protocol (VRRP), Clients such as Hot Standby Router Protocol (HSRP), Virtual Router Redundancy Protocol (VRRP), Gateway Load Balancing Protocol (GLBP), and (with this feature) PBR can register their interest in Gateway Load Balancing Protocol (GLBP), and (with this feature) PBR can register their interest in specific, tracked objects and then take action when the state of the objects changes.

specific, tracked objects and then take action when the state of the objects changes.

PBR

PBR Suppo

Support fo

rt for M

r M ulti

ultiple Tra

ple Track

cking Op

ing Options F

tions Fea

eature Design

ture Design

The PBR Support for Multiple Tracking Options feature gives PBR access to all the objects that are The PBR Support for Multiple Tracking Options feature gives PBR access to all the objects that are available through the tracking process. The tracking process provides the ability to track individual available through the tracking process. The tracking process provides the ability to track individual ob

objejectscts susuchch asas ICICMPMP pinpingg reareachchabiabililityty,, rouroutitingng adadjacjacenencycy,, anan apappliplicacatitionon rurunninningng onon aa reremotmotee dedevivicece,, aa route in the Routing Information Base (RIB), or to track the state of an interface line protocol.

route in the Routing Information Base (RIB), or to track the state of an interface line protocol.

Object tracking functions in the following manner. PBR will inform the tracking process that a certain Object tracking functions in the following manner. PBR will inform the tracking process that a certain object should be tracked. The tracking process will in turn notify PBR when the state of that object object should be tracked. The tracking process will in turn notify PBR when the state of that object changes.

changes.

How

How to C

to Con

onfigur

figure

e PBR

PBR Sup

Suppo

port fo

rt for M

r M ultiple

ultiple Track

Tracking O

ing Opt

ptions

ions

This section contains the following procedure:

•• Configuring PBR Configuring PBR Support for Multiple Support for Multiple Tracking Options, pageTracking Options, page22 (required)(required)

C

Configuring PBR

onfiguring PBR Supp

Support fo

ort for M

r M ulti

ultiple

ple Track

Tracking Op

ing Options

tions

This task configures PBR support for multiple tracking options. This task configures PBR support for multiple tracking options.

SUM

(3)

How

How to Confto Configure PBR Suppoigure PBR Support for Mrt for M ultiple ultiple Tracking OptionsTracking Options

5. 5. exitexit

6.

6. rtr schedulertr schedule operation-number operation-number [[lifelife {{foreverforever || secondsseconds}] [}] [start-timestart-time {{hhhh::mmmm[[::ssss] [] [month daymonth day|| day

day monmonthth] |] | pendingpending || nownow || afterafter hhhh::mmmm::ssss}] [}] [ageoutageout secondsseconds]]

7.

7. tracktrack object-number object-number rtrrtr entry-number entry-number [[reachabilityreachability]]

8. 8. exitexit

9.

9. interfaceinterface type number type number

10.

10. ip addressip address ip-address mask ip-address mask [[secondarysecondary]]

11.

11. ip policy route-map map-tagip policy route-mapmap-tag

12. 12. exitexit

13.

13. route-maproute-map map-tagmap-tag [[permitpermit || denydeny] [] [sequence-number sequence-number ]]

14.

14. set ip next-hop verify-availabilityset ip next-hop verify-availability [[next-hop-address sequencenext-hop-address sequence tracktrack object object ]]

DETAILED STEPS

C

Coommmmaannd d oor r AAccttiioonn PPuurrppoossee

St

Stepep 11 enableenable

Example: Example:

Rou

Routerter>> enaenableble

Enables privileged EXEC mode. Enables privileged EXEC mode.

•• Enter your password if prompted.Enter your password if prompted.

St

Stepep 22 configure terminalconfigure terminal

Example: Example:

Rout

Router#er# confconfigurigure terme terminalinal

Enters global configuration mode. Enters global configuration mode.

St

Stepep 33 rtrrtr operation-number operation-number

Example: Example:

Rout

Router(cer(confionfig)#g)# rtr rtr 11 OR

OR

Router(config)# ip sla monitor 1 Router(config)# ip sla monitor 1

Enters SAA RTR configuration mode and configures an Enters SAA RTR configuration mode and configures an SAA operation.

SAA operation.

Note

Note This command is replaced by the ‘ip sla monitorThis command is replaced by the ‘ip sla monitor operation-number

operation-number’ command in Release’ command in Release 12.3(14)T and

12.3(14)T and laterlater..

St

Stepep 44 type echo protocoltype echo protocol protocol-type targetprotocol-type target

[

[source-ipaddrsource-ipaddr ip-addressip-address]]

Example: Example:

Router

Router (config-r(config-rtr)#tr)# type type echo echo protocolprotocol ipicmpecho 10.1.1.10

ipicmpecho 10.1.1.10

Configures an SAA end-to-end echo response time probe Configures an SAA end-to-end echo response time probe operation.

operation.

St

Stepep 55 exitexit

Example: Example:

Rout

Router(cer(confionfig-rtg-rtr)#r)# exitexit

Exits SAA RTR configuration mode and returns the router Exits SAA RTR configuration mode and returns the router to global configuration mode.

(4)

How

How to Coto Configure PBR Suppnfigure PBR Support for Multiort for Multi ple Trackple Track ing Optionsing Options

St

Stepep 66 rtr schedulertr schedule operation-number operation-number [[lifelife {{foreverforever ||

seconds

seconds}] [}] [start-timestart-time {{hhhh::mmmm[[::ssss] [] [month day month day ||

day month

day month] |] | pendingpending || nownow || afterafter hhhh::mmmm::ssss}]}] [

[ageoutageout secondsseconds]]

Example: Example:

Router(co

Router(config)#nfig)# rtr scrtr schedule hedule 1 life 1 life foreverforever start-time now

start-time now

Configures the time parameters for the SAA operation. Configures the time parameters for the SAA operation.

Note

Note This command is replaced by theThis command is replaced by the ip sla monitorip sla monitor schedule

schedule command in Release 12.3(14)T and later.command in Release 12.3(14)T and later.

St

Stepep 77 tracktrack object-number object-number rtrrtr entry-number entry-number

[

[reachabilityreachability]]

Example: Example:

Router(co

Router(config)#nfig)# track track 123 rtr 123 rtr 1 reach1 reachabilityability

Tracks the reachability of an Response Time Reporter Tracks the reachability of an Response Time Reporter (RTR) object and enters tracking configuration mode. (RTR) object and enters tracking configuration mode.

St

Stepep 88 exitexit

Example: Example:

Rout

Router(cer(confionfig-trg-track)ack)## exitexit

Ex

Exititss trtracackikingng conconffigigurauratitionon momodede,, anandd reretuturnsrns ththee rorouteuterr toto global configuration mode.

global configuration mode.

St

Stepep 99 interfaceinterface type number type number

Example: Example:

Router(co

Router(config)#nfig)# interface interface ethernet ethernet 00

Sp

Specieciffieiess anan intintererfafacece tytypepe andand numnumberber,, anandd enentetersrs intintererfafacece configuration mode.

configuration mode.

St

Stepep 1010 ip addressip address ip-address maskip-address mask [[secondary secondary ]]

Example: Example:

Router(co

Router(config-if)#nfig-if)# ip ip address address 10.1.1.1110.1.1.11 255.0.0.0

255.0.0.0

Sp

Specieciffieiess aa prprimimararyy oror secseconondardaryy IPIP adaddredressss foforr anan ininteterfrfaceace..

•• RefeReferr toto thethe “Con“Conffiguriguringing IPIP AddrAddressiessing”ng” chapchapterter ofof thethe Release 12.3

Release 12.3 Cisco IOS IP Configuration GuideCisco IOS IP Configuration Guide forfor information on configuring IP addresses.

information on configuring IP addresses.

St

Stepep 1111 ip policy route-mapip policy route-map map-tag map-tag

Example: Example:

Router(co

Router(config-if)#nfig-if)# ip poip policy licy route-map route-map alphaalpha

En

Enablableses polpolicicyy roroututinging anandd ideidentntififieiess aa rorouteute mamapp toto bebe ususeded for policy routing.

for policy routing.

St

Stepep 1212 exitexit

Example: Example:

Rout

Router(cer(confionfig-ifg-if)#)# exitexit

Exi

Exitsts inteinterfarfacece conconffiguriguratiationon modmodee andand retreturnsurns thethe rourouterter toto global configuration mode.

global configuration mode.

St

Stepep 1313 route-maproute-map map-tag map-tag [[ permit permit || denydeny]] [

[sequence-number sequence-number ]]

Example: Example:

Rout

Router(cer(confionfig)#g)# routroute-mae-map p alphalphaa

Specifies a route map and enters route-map configuration Specifies a route map and enters route-map configuration mode.

mode.

St

Stepep 1414 set ip next-hop verify-availabilityset ip next-hop verify-availability [

[next-hop-address sequencenext-hop-address sequence tracktrack objectobject]]

Configures the route map to verify the reachability of the Configures the route map to verify the reachability of the tracked object.

tracked object.

C

(5)

Configuration Examples for PBR

Configuration Examples for PBR Support for Support for MM ultiplultipl e Trackie Tracki ng Optionsng Options

C

Configuration E

onfiguration Exa

xample

mples

s for

for PBR

PBR Supp

Support

ort for

for M

M ulti

ultiple

ple Trac

Tracki

king

ng

Options

This section provides the following configuration example: This section provides the following configuration example:

•• PBR Support for MultipPBR Support for Multiple Trackile Tracking Options: Exampng Options: Example, pagele, page55

PBR

PBR Supp

Support fo

ort for M

r M ulti

ultiple

ple Track

Tracking Opt

ing Options:

ions: E

Exa

xample

mple

In the following example, object tracking is configured for PBR. In the following example, object tracking is configured for PBR. Th

Thee popolilicycy isis ththatat papackcketetss rerececeiivevedd onon EtEthehernrnetet 0,0, shshououldld bebe foforwrwarardededd toto 1010.1.1.1.1.1.1 ononlyly ifif ththatat dedevivicece isis re

reacachahablblee (r(resespopondndiningg toto pipingngs)s).. IfIf 1010.1.1.1.1.1.1 isis nonott upup,, ththenen ththee papackcketetss shshououldld bebe foforwrwarardededd toto 1010.2.2.2.2.2.2.. If

If 1010.2.2.2.2.2.2 isis alalsoso nonott rereacachahablble,e, ththenen ththee popolilicycy roroututiningg fafaililss anandd ththee papackcketetss araree roroututeded acaccocordrdiningg toto ththee routing table.

routing table.

Two SAA Echo operations are configured to ping the remote devices. The SAA operations are then Two SAA Echo operations are configured to ping the remote devices. The SAA operations are then tracked. Policy routing will monitor the state of the tracked operations and make forwarding decisions tracked. Policy routing will monitor the state of the tracked operations and make forwarding decisions based on their state.

based on their state.

! define and start the SAA operations ! define and start the SAA operations rtr 1

rtr 1

type echo protocol ipicmpecho 10.1.1.1 type echo protocol ipicmpecho 10.1.1.1 rtr schedule 1 start-time now life forever rtr schedule 1 start-time now life forever !

! rtr 2 rtr 2

type echo protocol ipicmpecho 10.2.2.2 type echo protocol ipicmpecho 10.2.2.2 rtr schedule 2 start-time now life forever rtr schedule 2 start-time now life forever !

!

!track the SAA operations !track the SAA operations track 123 rtr 1 reachability track 123 rtr 1 reachability track 124 rtr 2 reachability track 124 rtr 2 reachability ! !

! enable policy routing on the incoming interface ! enable policy routing on the incoming interface interface ethernet 0

interface ethernet 0

ip address 10.4.4.4 255.255.255.0 ip address 10.4.4.4 255.255.255.0 ip policy route-map alpha

ip policy route-map alpha !

!

! 10.1.1.1 is via this interface ! 10.1.1.1 is via this interface interface ethernet 1 interface ethernet 1 ip address 10.1.1.254 255.255.255.0 ip address 10.1.1.254 255.255.255.0 ! !

! 10.2.2.2 is via this interface ! 10.2.2.2 is via this interface interface ethernet 2 interface ethernet 2 ip address 10.2.2.254 255.255.255.0 ip address 10.2.2.254 255.255.255.0 ! !

! define a route-map to set the next-hop depending on the state of the tracked rtrs ! define a route-map to set the next-hop depending on the state of the tracked rtrs route-map alpha

route-map alpha

set ip next-hop verify-availability 10.1.1.1 10 track 123 set ip next-hop verify-availability 10.1.1.1 10 track 123 set ip next-hop verify-availability 10.2.2.2 20 track 124 set ip next-hop verify-availability 10.2.2.2 20 track 124

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Additional References Additional References

Additional References

The following sections provide references related to the PBR Support for Multiple Tracking Options The following sections provide references related to the PBR Support for Multiple Tracking Options feature. feature.

Standards

MIBs

R

Reellaatteed d TTooppiicc DDooccuummeennt t TTiittllee

Object tracking within Cisco IOS software

Object tracking within Cisco IOS software Enhanced Object Tracking Enhanced Object Tracking feature feature documendocument, Ciscot, Cisco IOSIOS Rele

Releasease 12.212.2(15)(15)TT C

Coonnffiigguurriinng g IIP P aaddddrreesssseess ““CCoonnffiigguurriinng g IIP P AAddddrreessssiinngg” ” cchhaapptteer r iin n tthhee Cisco IOS IPCisco IOS IP Configuration Guide

Configuration Guide, Release 12.3, Release 12.3

S

Sttaannddaarrddss TTiittllee

No new or modified standards are supported by this No new or modified standards are supported by this fe

feataturure,e, andand supsupporportt foforr exexisistitingng ststandandarardsds hashas nonott beebeenn modified by this feature.

modified by this feature.

— —

M

M IIBBss MM IIBBssLLiinnkk

No new or modified MIBs are supported by this No new or modified MIBs are supported by this feature, and support for existing MIBs has not been feature, and support for existing MIBs has not been modified by this feature.

To

To locate and download MIBs for locate and download MIBs for selected platforms, Ciscoselected platforms, Cisco IOSIOS release

releases, and feature sets, use Ciscos, and feature sets, use Cisco MIB Locator found at theMIB Locator found at the following URL:

following URL:

http://www.cisco.com/go/mibs

(7)

Command Reference Command Reference

RFCs

Technical

Technical Ass

Assistance

istance

C

Comm

ommand

and R

Refe

eferenc

rencee

The following modified command is pertinent to this feature. To see the command pages for this The following modified command is pertinent to this feature. To see the command pages for this command and other commands used with this feature, go to the

command and other commands used with this feature, go to the Cisco IOS Master Commands List Cisco IOS Master Commands List ,, Release 12.4, at

Release 12.4, at http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124mindx/ http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124mindx/

124index.htm

124index.htm..

•• set ip next-hop verify-availabilityset ip next-hop verify-availability

R

RFFCCss TTiittllee

No new or modified RFCs are supported by this No new or modified RFCs are supported by this feature, and support for existing RFCs has not been feature, and support for existing RFCs has not been modified by this feature.

— —

D

Deessccrriippttiioonn LLiinnkk

Technical Assistance Center (TAC) home page, Technical Assistance Center (TAC) home page, containing 30,000 pages of searchable technical containing 30,000 pages of searchable technical content, including links to products, technologies, content, including links to products, technologies, solutions, technical tips, and tools. Registered solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access Cisco.com users can log in from this page to access even more content.

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CCSP

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the Cisco Systems logo, Cisco Unity, Enterprise/Solver, EtherChannel, EtherFast, EtherSwitch, Fast Step, FormShare, GCisco Unity, Enterprise/Solver, EtherChannel, EtherFast, EtherSwitch, Fast Step, FormShare, GigaDrive, GigaStack, HomeLink,igaDrive, GigaStack, HomeLink,

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(8)

Comm

PBR Support for Multiple Tracking Options

PBR

PBR Sup

Suppo

port fo

rt for M

r M ultiple

ultiple Track

Tracking O

ing Option

ptionss

Contents

Contents

Information Abou

Information About PBR

t PBR Supp

Support f

ort for M

or M ulti

ultiple

ple Trac

Tracki

king

ng O

Options

ptions

O

Objec

bject T

t Track

racking

ing

PBR

PBR Suppo

Support fo

rt for M

r M ulti

ultiple Tra

ple Track

cking Op

ing Options F

tions Fea

eature Design

ture Design

How

How to C

to Con

onfigur

figure

e PBR

PBR Sup

Suppo

port fo

rt for M

r M ultiple

ultiple Track

Tracking O

ing Opt

ptions

ions

C

Configuring PBR

onfiguring PBR Supp

Support fo

ort for M

r M ulti

ultiple

ple Track

Tracking Op

ing Options

tions

SUM

DETAILED STEPS

DETAILED STEPS

C

Configuration E

onfiguration Exa

xample

mples

s for