HSRP uses a priority mechanism to determine which HSRP configured device is to be the default active device. A new standby device is also selected at that time.
Hsrp and router on a stick 12.4 mac#
HSRP detects when the designated active device fails, at which point a selected standby device assumes control of the MAC and IP addresses of the Hot Standby group. The active device receives and routes packets destined for the MAC address of the group. One of these devices is selected by the protocol to be the active device. The address of this HSRP group is referred to as the When HSRP is configured on a network segment, it provides a virtual MAC address and an IP address that is shared among a group of devices running HSRP. Because existing TCP sessions can survive the failover, this protocol also provides a more transparent recovery for hosts that dynamically choose a next hop for routing IP traffic. HSRP is useful for hosts that do not support a discovery protocol (such as ICMP Router Discovery Protocol ) and cannot switch to a new device when their selected device reloads or loses power. When HSRP is used, the HSRP virtual IP address is configured as the host’s default gateway instead of the IP address of the device. Most IP hosts have an IP address of a single device configured as the default gateway. HSRP is not intended as a replacement for existing dynamic protocols. HSRP is designed for use over multiaccess, multicast, or broadcast capable Ethernet LANs. To access Cisco Feature Navigator, go to An account on is not required.
Hsrp and router on a stick 12.4 software#
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. 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. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. Your software release may not support all the features documented in this module. In a group of device interfaces, the active device is the device of choice for routing packets the standby device is the device that takes over when the active device fails or when preset conditions are met. HSRP is used in a group of routers for selecting an active device and a standby device. HSRP provides high network availability by providing first-hop routing redundancy for IP hosts on networks configured with a default gateway IP address. The Hot Standby Router Protocol (HSRP) is a First Hop Redundancy Protocol (FHRP) designed to allow for transparent failover of the first-hop IP device. Example: Linking IP Redundancy Clients to HSRP Groups.Example: Configuring HSRP Virtual MAC Addresses and BIA MAC Address.Example: Configuring HSRP Support for ICMP Redirect Messages.Example: Improving CPU and Network Performance with HSRP Multiple Group Optimization.Example: Configuring Multiple HSRP Groups for Load Balancing.Example: Configuring HSRP Text Authentication.Example: Configuring HSRP MD5 Authentication Using Key Strings and Key Chains.Example: Configuring HSRP MD5 Authentication Using Key Chains.Example: Configuring HSRP MD5 Authentication Using Key Strings.Example: Configuring HSRP Group Shutdown.Example: Configuring HSRP Object Tracking.Example: Configuring HSRP Priority and Preemption.Configuring BFD Session Parameters on an Interface.Linking IP Redundancy Clients to HSRP Groups.Configuring HSRP Virtual MAC Addresses or BIA MAC Addresses.Enabling HSRP Support for ICMP Redirect Messages.Improving CPU and Network Performance with HSRP Multiple Group Optimization.Configuring Multiple HSRP Groups for Load Balancing.Configuring an HSRP MAC Refresh Interval.Troubleshooting HSRP MD5 Authentication.Configuring HSRP MD5 Authentication Using a Key Chain.Configuring HSRP MD5 Authentication Using a Key String.Configuring HSRP Priority and Preemption.Delaying the Initialization of HSRP on an Interface.SSO Dual-Route Processors and Cisco Nonstop Forwarding.HSRP Support for ICMP Redirect Messages.HSRP Group Linking to IP Redundancy Clients.HSRP Virtual MAC Addresses and BIA MAC Addresses.How Object Tracking Affects the Priority of an HSRP Device.
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