Contents
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
HSRP support for a Multiprotocol Label Switching (MPLS) VPN interface is useful when an Ethernet LAN is connected between two provider edge (PE) devices with either of the following conditions:
A customer edge (CE) device with a default route to the HSRP virtual IP address
One or more hosts with the HSRP virtual IP address configured as the default gateway
Each VPN is associated with one or more VPN routing and forwarding (VRF) instances. A VRF consists of the following elements:
IP routing table
Cisco Express Forwarding table
Set of interfaces that use the Cisco Express Forwarding forwarding table
Set of rules and routing protocol parameters to control the information in the routing tables
VPN routing information is stored in the IP routing table and the Cisco Express Forwarding table for each VRF. A separate set of routing and Cisco Express Forwarding tables is maintained for each VRF. These tables prevent information from being forwarded outside a VPN and also prevent packets that are outside a VPN from being forwarded to a device within the VPN.
HSRP adds ARP entries and IP hash table entries (aliases) using the default routing table instance. However, a different routing table instance is used when VRF forwarding is configured on an interface, causing ARP and ICMP echo requests for the HSRP virtual IP address to fail.
HSRP support for MPLS VPNs ensures that the HSRP virtual IP address is added to the correct IP routing table and not to the default routing table.
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Related Topic |
Document Title |
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Cisco IOS commands |
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HSRP commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples |
Cisco IOS First Hop redundancy Protocols Command Reference |
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HSRP for IPv6 |
“HSRP for IPv6” module |
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Troubleshooting HSRP |
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Standards |
Title |
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No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature. |
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MIBs |
MIBs Link |
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CISCO-HSRP-MIB CISCO-HSRP-EXT-MIB |
To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL: |
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RFCs |
Title |
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RFC 792 |
Internet Control Message Protocol |
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RFC 1828 |
IP Authentication Using Keyed MD5 |
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RFC 2281 |
Cisco Hot Standby Router Protocol |
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Description |
Link |
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The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Feature Name |
Releases |
Feature Information |
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HSRP Support for MPLS VPNs |
12.0(23)S 12.0(17)ST 12.2(28)SB 12.2(17b)SXA 12.2(8)T 12.2(50)SY 15.0(1)S 15.0(1)SY Cisco IOS XE Release 2.1 |
HSRP support for a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) interface is useful when an Ethernet LAN is connected between two provider edge (PE) devices under certain conditions. There are no new or modified commands for this feature. |