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PBR Support for Multiple Tracking Options The PBR Support for Multiple Tracking Options feature extends the capabilities of object tracking using 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 Protocol (ICMP) ping, User Datagram Protocol (UDP) ping, or an HTTP GET request. Feature History for PBR Support for Multiple Tracking Options
Release
Modification
12.3(4)T
This feature was introduced.
12.2(25)S
This feature was integrated into Cisco IOS Release 12.2(25)S.
12.4
The SAA (rtr) feature was replaced by the IP SLAs feature. See http://www.cisco.com/go/ipsla/ for updated documentation.
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.
Contents •
Information About PBR Support for Multiple Tracking Options, page 2
•
How to Configure PBR Support for Multiple Tracking Options, page 2
•
Configuration Examples for PBR Support for Multiple Tracking Options, page 5
•
Additional References, page 6
•
Command Reference, page 7
Corporate Headquarters: Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706 USA
Copyright © 2004 Cisco Systems, Inc. All rights reserved.
PBR Support for Multiple Tracking Options Information About PBR Support for Multiple Tracking Options
Information About PBR Support for Multiple Tracking Options To configure the PBR Support for Multiple Tracking Options feature, you should understand the following concepts: •
Object Tracking, page 2
•
PBR Support for Multiple Tracking Options Feature Design, page 2
Object Tracking Object tracking is an independent process that monitors objects such as the following: •
State of the line protocol of an interface
•
Existence of an entry in the routing table
•
Results of an IP SLA monitoring operation, such as a ping
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 specific, tracked objects and then take action when the state of the objects changes.
PBR Support for Multiple Tracking Options Feature Design 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 objects such as ICMP ping reachability, routing adjacency, an application running on a remote device, a 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 should be tracked. The tracking process will in turn notify PBR when the state of that object changes.
How to Configure PBR Support for Multiple Tracking Options This section contains the following procedure: •
Configuring PBR Support for Multiple Tracking Options, page 2 (required)
Configuring PBR Support for Multiple Tracking Options This task configures PBR support for multiple tracking options.
SUMMARY STEPS
Book Title
2
1.
enable
2.
configure terminal
3.
rtr operation-number
4.
type echo protocol protocol-type target [source-ipaddr ip-address]
PBR Support for Multiple Tracking Options How to Configure PBR Support for Multiple Tracking Options
5.
exit
6.
rtr schedule operation-number [life {forever | seconds}] [start-time {hh:mm[:ss] [month day | day month] | pending | now | after hh:mm:ss}] [ageout seconds]
7.
track object-number rtr entry-number [reachability]
8.
exit
9.
interface type number
10. ip address ip-address mask [secondary] 11. ip policy route-map map-tag 12. exit 13. route-map map-tag [permit | deny] [sequence-number] 14. set ip next-hop verify-availability [next-hop-address sequence track object]
DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode. •
Enter your password if prompted.
Example: Router> enable
Step 2
configure terminal
Enters global configuration mode.
Example: Router# configure terminal
Step 3
rtr operation-number
Enters SAA RTR configuration mode and configures an SAA operation.
Example:
Note
Router(config)# rtr 1 OR Router(config)# ip sla monitor 1
Step 4
type echo protocol protocol-type target [source-ipaddr ip-address]
This command is replaced by the ‘ip sla monitor operation-number’ command in Release 12.3(14)T and later.
Configures an SAA end-to-end echo response time probe operation.
Example: Router (config-rtr)# type echo protocol ipicmpecho 10.1.1.10
Step 5
exit
Exits SAA RTR configuration mode and returns the router to global configuration mode.
Example: Router(config-rtr)# exit
Book Title
3
PBR Support for Multiple Tracking Options How to Configure PBR Support for Multiple Tracking Options
Step 6
Command or Action
Purpose
rtr schedule operation-number [life {forever | seconds}] [start-time {hh:mm[:ss] [month day | day month] | pending | now | after hh:mm:ss}] [ageout seconds]
Configures the time parameters for the SAA operation. Note
This command is replaced by the ip sla monitor schedule command in Release 12.3(14)T and later.
Example: Router(config)# rtr schedule 1 life forever start-time now
Step 7
track object-number rtr entry-number [reachability]
Tracks the reachability of an Response Time Reporter (RTR) object and enters tracking configuration mode.
Example: Router(config)# track 123 rtr 1 reachability
Step 8
Exits tracking configuration mode, and returns the router to global configuration mode.
exit
Example: Router(config-track)# exit
Step 9
interface type number
Specifies an interface type and number, and enters interface configuration mode.
Example: Router(config)# interface ethernet 0
Step 10
ip address ip-address mask [secondary]
Specifies a primary or secondary IP address for an interface. •
Example: Router(config-if)# ip address 10.1.1.11 255.0.0.0
Step 11
ip policy route-map map-tag
Refer to the “Configuring IP Addressing” chapter of the Release 12.3 Cisco IOS IP Configuration Guide for information on configuring IP addresses.
Enables policy routing and identifies a route map to be used for policy routing.
Example: Router(config-if)# ip policy route-map alpha
Step 12
Exits interface configuration mode and returns the router to global configuration mode.
exit
Example: Router(config-if)# exit
Step 13
route-map map-tag [permit | deny] [sequence-number]
Specifies a route map and enters route-map configuration mode.
Example: Router(config)# route-map alpha
Step 14
set ip next-hop verify-availability [next-hop-address sequence track object]
Example: Router(config-route-map)# set ip next-hop verify-availability 10.1.1.1 10 track 123
Book Title
4
Configures the route map to verify the reachability of the tracked object.
PBR Support for Multiple Tracking Options Configuration Examples for PBR Support for Multiple Tracking Options
Configuration Examples for PBR Support for Multiple Tracking Options This section provides the following configuration example: •
PBR Support for Multiple Tracking Options: Example, page 5
PBR Support for Multiple Tracking Options: Example In the following example, object tracking is configured for PBR. The policy is that packets received on Ethernet 0, should be forwarded to 10.1.1.1 only if that device is reachable (responding to pings). If 10.1.1.1 is not up, then the packets should be forwarded to 10.2.2.2. If 10.2.2.2 is also not reachable, then the policy routing fails and the packets are routed according to the routing table. 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 based on their state. ! define and start the SAA operations rtr 1 type echo protocol ipicmpecho 10.1.1.1 rtr schedule 1 start-time now life forever ! rtr 2 type echo protocol ipicmpecho 10.2.2.2 rtr schedule 2 start-time now life forever ! !track the SAA operations track 123 rtr 1 reachability track 124 rtr 2 reachability ! ! enable policy routing on the incoming interface interface ethernet 0 ip address 10.4.4.4 255.255.255.0 ip policy route-map alpha ! ! 10.1.1.1 is via this interface interface ethernet 1 ip address 10.1.1.254 255.255.255.0 ! ! 10.2.2.2 is via this interface interface ethernet 2 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 route-map alpha 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
Book Title
5
PBR Support for Multiple Tracking Options Additional References
Additional References The following sections provide references related to the PBR Support for Multiple Tracking Options feature.
Related Documents Related Topic
Document Title
Object tracking within Cisco IOS software
Enhanced Object Tracking feature document, Cisco IOS Release 12.2(15)T
Configuring IP addresses
“Configuring IP Addressing” chapter in the Cisco IOS IP Configuration Guide, Release 12.3
Standards Standards
Title
No new or modified standards are supported by this — feature, and support for existing standards has not been modified by this feature.
MIBs MIBs
MIBs Link
No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: http://www.cisco.com/go/mibs
Book Title
6
PBR Support for Multiple Tracking Options Command Reference
RFCs RFCs
Title
No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.
—
Technical Assistance Description
Link
Technical Assistance Center (TAC) home page, containing 30,000 pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.
http://www.cisco.com/public/support/tac/home.shtml
Command Reference 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 Cisco IOS Master Commands List, Release 12.4, at http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124mindx/ 124index.htm. •
set ip next-hop verify-availability
CCSP, CCVP, the Cisco Square Bridge logo, Follow Me Browsing, and StackWise are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn, and iQuick Study are service marks of Cisco Systems, Inc.; and Access Registrar, Aironet, BPX, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Cisco Unity, Enterprise/Solver, EtherChannel, EtherFast, EtherSwitch, Fast Step, FormShare, GigaDrive, GigaStack, HomeLink, Internet Quotient, IOS, IP/TV, iQ Expertise, the iQ logo, iQ Net Readiness Scorecard, LightStream, Linksys, MeetingPlace, MGX, the Networkers logo, Networking Academy, Network Registrar, Packet, PIX, Post-Routing, Pre-Routing, ProConnect, RateMUX, ScriptShare, SlideCast, SMARTnet, The Fastest Way to Increase Your Internet Quotient, and TransPath are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries. All other trademarks mentioned in this document or Website are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0601R)
© 2004 Cisco Systems, Inc. All rights reserved.
Book Title
7
PBR Support for Multiple Tracking Options Command Reference
Book Title
8
Release
Modification
12.3(4)T
This feature was introduced.
12.2(25)S
This feature was integrated into Cisco IOS Release 12.2(25)S.
12.4
The SAA (rtr) feature was replaced by the IP SLAs feature. See http://www.cisco.com/go/ipsla/ for updated documentation.
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.
Contents •
Information About PBR Support for Multiple Tracking Options, page 2
•
How to Configure PBR Support for Multiple Tracking Options, page 2
•
Configuration Examples for PBR Support for Multiple Tracking Options, page 5
•
Additional References, page 6
•
Command Reference, page 7
Corporate Headquarters: Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706 USA
Copyright © 2004 Cisco Systems, Inc. All rights reserved.
PBR Support for Multiple Tracking Options Information About PBR Support for Multiple Tracking Options
Information About PBR Support for Multiple Tracking Options To configure the PBR Support for Multiple Tracking Options feature, you should understand the following concepts: •
Object Tracking, page 2
•
PBR Support for Multiple Tracking Options Feature Design, page 2
Object Tracking Object tracking is an independent process that monitors objects such as the following: •
State of the line protocol of an interface
•
Existence of an entry in the routing table
•
Results of an IP SLA monitoring operation, such as a ping
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 specific, tracked objects and then take action when the state of the objects changes.
PBR Support for Multiple Tracking Options Feature Design 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 objects such as ICMP ping reachability, routing adjacency, an application running on a remote device, a 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 should be tracked. The tracking process will in turn notify PBR when the state of that object changes.
How to Configure PBR Support for Multiple Tracking Options This section contains the following procedure: •
Configuring PBR Support for Multiple Tracking Options, page 2 (required)
Configuring PBR Support for Multiple Tracking Options This task configures PBR support for multiple tracking options.
SUMMARY STEPS
Book Title
2
1.
enable
2.
configure terminal
3.
rtr operation-number
4.
type echo protocol protocol-type target [source-ipaddr ip-address]
PBR Support for Multiple Tracking Options How to Configure PBR Support for Multiple Tracking Options
5.
exit
6.
rtr schedule operation-number [life {forever | seconds}] [start-time {hh:mm[:ss] [month day | day month] | pending | now | after hh:mm:ss}] [ageout seconds]
7.
track object-number rtr entry-number [reachability]
8.
exit
9.
interface type number
10. ip address ip-address mask [secondary] 11. ip policy route-map map-tag 12. exit 13. route-map map-tag [permit | deny] [sequence-number] 14. set ip next-hop verify-availability [next-hop-address sequence track object]
DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode. •
Enter your password if prompted.
Example: Router> enable
Step 2
configure terminal
Enters global configuration mode.
Example: Router# configure terminal
Step 3
rtr operation-number
Enters SAA RTR configuration mode and configures an SAA operation.
Example:
Note
Router(config)# rtr 1 OR Router(config)# ip sla monitor 1
Step 4
type echo protocol protocol-type target [source-ipaddr ip-address]
This command is replaced by the ‘ip sla monitor operation-number’ command in Release 12.3(14)T and later.
Configures an SAA end-to-end echo response time probe operation.
Example: Router (config-rtr)# type echo protocol ipicmpecho 10.1.1.10
Step 5
exit
Exits SAA RTR configuration mode and returns the router to global configuration mode.
Example: Router(config-rtr)# exit
Book Title
3
PBR Support for Multiple Tracking Options How to Configure PBR Support for Multiple Tracking Options
Step 6
Command or Action
Purpose
rtr schedule operation-number [life {forever | seconds}] [start-time {hh:mm[:ss] [month day | day month] | pending | now | after hh:mm:ss}] [ageout seconds]
Configures the time parameters for the SAA operation. Note
This command is replaced by the ip sla monitor schedule command in Release 12.3(14)T and later.
Example: Router(config)# rtr schedule 1 life forever start-time now
Step 7
track object-number rtr entry-number [reachability]
Tracks the reachability of an Response Time Reporter (RTR) object and enters tracking configuration mode.
Example: Router(config)# track 123 rtr 1 reachability
Step 8
Exits tracking configuration mode, and returns the router to global configuration mode.
exit
Example: Router(config-track)# exit
Step 9
interface type number
Specifies an interface type and number, and enters interface configuration mode.
Example: Router(config)# interface ethernet 0
Step 10
ip address ip-address mask [secondary]
Specifies a primary or secondary IP address for an interface. •
Example: Router(config-if)# ip address 10.1.1.11 255.0.0.0
Step 11
ip policy route-map map-tag
Refer to the “Configuring IP Addressing” chapter of the Release 12.3 Cisco IOS IP Configuration Guide for information on configuring IP addresses.
Enables policy routing and identifies a route map to be used for policy routing.
Example: Router(config-if)# ip policy route-map alpha
Step 12
Exits interface configuration mode and returns the router to global configuration mode.
exit
Example: Router(config-if)# exit
Step 13
route-map map-tag [permit | deny] [sequence-number]
Specifies a route map and enters route-map configuration mode.
Example: Router(config)# route-map alpha
Step 14
set ip next-hop verify-availability [next-hop-address sequence track object]
Example: Router(config-route-map)# set ip next-hop verify-availability 10.1.1.1 10 track 123
Book Title
4
Configures the route map to verify the reachability of the tracked object.
PBR Support for Multiple Tracking Options Configuration Examples for PBR Support for Multiple Tracking Options
Configuration Examples for PBR Support for Multiple Tracking Options This section provides the following configuration example: •
PBR Support for Multiple Tracking Options: Example, page 5
PBR Support for Multiple Tracking Options: Example In the following example, object tracking is configured for PBR. The policy is that packets received on Ethernet 0, should be forwarded to 10.1.1.1 only if that device is reachable (responding to pings). If 10.1.1.1 is not up, then the packets should be forwarded to 10.2.2.2. If 10.2.2.2 is also not reachable, then the policy routing fails and the packets are routed according to the routing table. 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 based on their state. ! define and start the SAA operations rtr 1 type echo protocol ipicmpecho 10.1.1.1 rtr schedule 1 start-time now life forever ! rtr 2 type echo protocol ipicmpecho 10.2.2.2 rtr schedule 2 start-time now life forever ! !track the SAA operations track 123 rtr 1 reachability track 124 rtr 2 reachability ! ! enable policy routing on the incoming interface interface ethernet 0 ip address 10.4.4.4 255.255.255.0 ip policy route-map alpha ! ! 10.1.1.1 is via this interface interface ethernet 1 ip address 10.1.1.254 255.255.255.0 ! ! 10.2.2.2 is via this interface interface ethernet 2 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 route-map alpha 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
Book Title
5
PBR Support for Multiple Tracking Options Additional References
Additional References The following sections provide references related to the PBR Support for Multiple Tracking Options feature.
Related Documents Related Topic
Document Title
Object tracking within Cisco IOS software
Enhanced Object Tracking feature document, Cisco IOS Release 12.2(15)T
Configuring IP addresses
“Configuring IP Addressing” chapter in the Cisco IOS IP Configuration Guide, Release 12.3
Standards Standards
Title
No new or modified standards are supported by this — feature, and support for existing standards has not been modified by this feature.
MIBs MIBs
MIBs Link
No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: http://www.cisco.com/go/mibs
Book Title
6
PBR Support for Multiple Tracking Options Command Reference
RFCs RFCs
Title
No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.
—
Technical Assistance Description
Link
Technical Assistance Center (TAC) home page, containing 30,000 pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.
http://www.cisco.com/public/support/tac/home.shtml
Command Reference 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 Cisco IOS Master Commands List, Release 12.4, at http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124mindx/ 124index.htm. •
set ip next-hop verify-availability
CCSP, CCVP, the Cisco Square Bridge logo, Follow Me Browsing, and StackWise are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn, and iQuick Study are service marks of Cisco Systems, Inc.; and Access Registrar, Aironet, BPX, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Cisco Unity, Enterprise/Solver, EtherChannel, EtherFast, EtherSwitch, Fast Step, FormShare, GigaDrive, GigaStack, HomeLink, Internet Quotient, IOS, IP/TV, iQ Expertise, the iQ logo, iQ Net Readiness Scorecard, LightStream, Linksys, MeetingPlace, MGX, the Networkers logo, Networking Academy, Network Registrar, Packet, PIX, Post-Routing, Pre-Routing, ProConnect, RateMUX, ScriptShare, SlideCast, SMARTnet, The Fastest Way to Increase Your Internet Quotient, and TransPath are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries. All other trademarks mentioned in this document or Website are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0601R)
© 2004 Cisco Systems, Inc. All rights reserved.
Book Title
7
PBR Support for Multiple Tracking Options Command Reference
Book Title
8
