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Technical Tip
TT-0501203a -- Informational -- 01-Feb-2005

Configuring VRRP and using Tracking for Failover
Contents
Contents.........................................

.................................................................................................................................1 Introduction .....................................................................................................................................................................1 Associated Products .......................................................................................................................................................1 Description ......................................................................................................................................................................2 VRRP without Tracking (one link down).....................................................................................................................2 VRRP with Tracking (one link down)..........................................................................................................................3 Conclusion ......................................................................................................................................................................6

Introduction
This technical tip explains the combination of VRRP with priority tracking. VRRP is based upon RFC 2338. While there are many whitepapers that discuss VRRP, this document will focus upon priority tracking.

Associated Products
The information in this document is intended to be used with the following product(s) with the indicated software or hardware revisions:
Product Name or Order Number Nortel Application Switch and Web Switch (formerly known as Alteon) Revision Information Potentially Affected Corrected ALL ALL

?2005 Nortel Networks Limited. All Rights Reserved

TT-0501203a

Configuring VRRP and using Tracking for Failover

Description
VRRP without Tracking (one link down)
The first example shows what happens when VRRP tracking is not enabled. 1. Client 172.21.23.34 pings client 10.10.10.103. 2. Client 172.21.23.34 sends ICMP packets to its default gateway, 172.21.1.1. 3. The default gateway, 172.21.1.1, is a VIR that exists on both switches. 4. A1 processes the ICMP request because it is Master for 172.21.1.1. 5. Since the link between A1 and the hub on the 10.10.10.x subnet is down, A1 does not have a path to the host and must return a “destination host unreachable” back to the client.

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TT-0501203a

Configuring VRRP and using Tracking for Failover

VRRP with Tracking (one link down)
The second example shows what happens when VRRP tracking is enabled and a link fails. As soon as the link is pulled, A1s priority drops from 105 to 103. A2s priority stays at 104 and becomes Master for VIR 1 and VIR 3. A1 VIR 1, priority 101 1 Ifs x 2 = 2 101 + 2 = 103 priority A2 VIR 1, priority 100 2 Ifs x 2 = 4 100 + 4 = 104 priority NOTE: A2 is Master for VIR 1 because it has a priority of 104 versus A1 with a priority of 103 (1 IP interfaces with a default increment of 2)

1. Client 172.21.23.34 pings client 10.10.10.103. 2. Client 172.21.23.34 sends ICMP packets to its default gateway, 172.21.1.1. 3. The default gateway, 172.21.1.1, is a VIR that exists on both switches. 4. A2 processes the ICMP request because it is Master for 172.21.1.1. 5. The ping is forwarded from A2 to the client, 10.10.10.101. 6. The client 10.10.10.101 responds to the source IP address of the ICMP, 172.21.23.34. Since the source IP is on a different subnet, the client sends the ICMP response to its default gateway, 10.10.10.1. 7. A2 will process the ICMP response since it is the Master VIR for 10.10.10.1. 8. A2 forwards the request to the client, 172.21.23.34. 9. The ping is successful.

?2005 Nortel Networks Limited. All Rights Reserved

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TT-0501203a

Configuring VRRP and using Tracking for Failover

?2005 Nortel Networks Limited. All Rights Reserved

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TT-0501203a

Configuring VRRP and using Tracking for Failover

Configuration: Switch A1 /cfg/vlan 2/en/add 2 /cfg/ip/if 1/addr 172.16.1.2/ena /cfg/ip/if 2/mask 255.255.255.0/addr 10.1010.2/en/vlan 2 /cfg/vrrp/on /cfg/vrrp/vr 1 addr 172.16.1.1 en if 1 prio 101 share dis vrid 1 track/ifs ena /cfg/vrrp/vr 2 addr 10.10.0.10.1 en if 2 prio 101 share dis vrid 2 track/ifs ena

?2005 Nortel Networks Limited. All Rights Reserved

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TT-0501203a

Configuring VRRP and using Tracking for Failover

Switch A2 /cfg/vlan 2/en/add 2 /cfg/ip/if 1/addr 172.16.1.3/ena /cfg/ip/if 2/mask 255.255.255.0/addr 10.1010.3/en/vlan 2 /cfg/vrrp/on /cfg/vrrp/vr 1 addr 172.16.1.1 en if 1 prio 100 share dis vrid 1 track/ifs ena /cfg/vrrp/vr 2 addr 10.10.0.10.1 en if 2 prio 100 share dis vrid 2 track/ifs ena

VRRP configuration can be confirmed by issuing the following command: /info/vrrp/dump

Below is the output from switch A1: VRRP information: 1: vrid 2: vrid 1, 172.16.1.1, 2, 10.10.10.1, if 1, renter, prio 103, backup if 2, renter, prio 101, init

Below is the output from switch A2: VRRP information: 1: vrid 2: vrid 1, 172.16.1.1, 2, 10.10.10.1, if 1, renter, prio 104, master if 2, renter, prio 104, master

Conclusion
VRRP with tracking is a very important key to a properly designed network. If the environment includes SLB, the tracking criteria may include: l4pts or reals.

?2005 Nortel Networks Limited. All Rights Reserved

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TT-0501203a

Configuring VRRP and using Tracking for Failover

Copyright ? 2005 Nortel Networks Limited - All Rights Reserved. Nortel, Nortel Networks, the Nortel logo, Globemark and Alteon are trademarks of Nortel Networks Limited. The information in this document is subject to change without notice. The statements, configurations, technical data, and recommendations in this document are believed to be accurate and reliable, but are presented without express or implied warranty. Users must take full responsibility for their applications of any products specified in this document. The information in this document is proprietary to Nortel Networks Limited. To access more technical documentation, search our knowledge base, or open a service request online, please visit Nortel Networks Technical Support on the web at: http://www.nortel.com/support If after following this guide you are still having problems, please ensure you have carried out the steps exactly as in this document. If problems still persist, please contact Nortel Networks Technical Support (contact information is available online at: http://www.nortel.com/cgibin/comments/comments.cgi?key=techsupport_cu).

?2005 Nortel Networks Limited. All Rights Reserved

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