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.
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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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Feature Information for HSRP Support for MPLS VPNs
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.
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Table 1 Feature Information for HSRP Support for MPLS VPNs
HSRP Support for MPLS VPNs
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.