Cisco hsrp standby mac address

Range is 15 to Command Default Default minimum interval is 15 ms. Range is 2 to Command Default Default value is 3.

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  • HSRP Commands.
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  • HSRP configuration on Cisco: from Basic to Advanced - RouterFreak.

Command Default minimum value : 1 reload value : 5. The values of zero must be explicitly configured to turn this feature off. Command Default group-number : 0 If this command is not configured, and the hsrp use-bia command is not configured, the standard virtual MAC address is used: Examples If the end nodes are configured to use Command Default group-number : 0 seconds : 0 seconds if the router wants to preempt, it does immediately. Examples In the following example, the router waits for seconds 5 minutes after having determined that it should preempt before attempting to preempt the active router.

Table of Contents

Command Default group-number : 0 priority : Default is 3 seconds. Command Default group-number : 0 hello-seconds : 3 seconds If the msec keyword is specified, there is no default value. For more information, use the question mark?

- HSRP (Hot Standby Router Protocol) configuration - Packet tracer (Cisco)

Command Default group-number : 0 priority-decrement : Syntax Description This command has no arguments or keywords. Command Modes Global configuration. Optional After this vertical bar , specify one of the following output modifiers and a keyword from the output: begin —Begins the output from the word that you specify. Command Default The brief keyword is the default. Task ID Operations hsrp read. Local state is State of local networking device; can be one of the following: Active—Current Hot Standby router.

Hot Standby Router Protocol (HSRP)

Standby—Router next in line to be the Hot Standby router. Speak—Router is sending packets to claim the active or standby role. Init—Router is not yet ready to participate in HSRP, possibly because the associated interface is not up. Hellotime Current time in seconds between sending of hello packets, learned dynamically from the hello packets received from the active Hot Standby router.

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  • Introduction to The Hot Standby Router Protocol (HSRP).

Next hello sent in Time in which the software will send the next hello packet in hours:minutes:seconds. Address of the current active Hot Standby router. Standby virtual mac address is MAC address associated with the standby group address. Tracking interface states for List of interfaces that are being tracked and their corresponding states. Priority decrement Value by which the standby priority is decremented or incremented when the tracked interface goes down or up, respectively. Authentication string.

This command was introduced. Displays HSRP information. Release 3.

Configures the multiplier value for BFD. Specify the minimum-interval in milliseconds. Specifies the BFD multiplier value.



Sets the minimum delay in seconds for every interface up event. Sets the reload delay in seconds for first interface up event. Optional IP address of the Hot Standby router interface. Configures HSRP priority. Optional Group number on the interface to which the priority applies.

This command was supported. Configures HSRP preemption and preemption delay. Optional Group number on the interface to which the timers apply. Hello interval in seconds. Hello interval in milliseconds.

HSRP Configuration

Optional Group number on the interface to which the tracking applies. Interface type. Physical interface or virtual interface. Optional Group number on the interface for which output is displayed. Interface type and number and Hot Standby group number for the interface. State of local networking device; can be one of the following: Active—Current Hot Standby router. Next hello sent in. Time in which the software will send the next hello packet in hours:minutes:seconds. Displays BFD related information with multiplier and minimum interval details.

Hot standby IP address is configured. Standby virtual mac address is. MAC address associated with the standby group address. Number of times the router changed the standby state. Time in hours:minutes:seconds expired since the last state change.

How to configure Hot Standby Router Protocol (HSRP) with Cisco routers

Tracking interface states for. Priority decrement. Configures an authentication string for HSRP. Activates the HSRP. I might start off with I lose an interface. I'm going to drop it by That is in fact the default decrement value. So if I tie multiple interfaces to this, and these could be the interfaces to the core of my network, lose one, decrement by Now I've got a priority of Lose another, priority of 80 and there are even ways of customizing this.

But what did I just do? I look at the status of my ports, one port goes down and it's a completely new ball game. The standby router can be configured to take over when it sees that the active router has a lower priority. We need another feature beyond interface tracking: we need preempt. We need the standby router to be comfortable enough to take over the reins. We call that standby preempt, that's in fact the command. So we make HSRP preemptive, which means adjust on the fly.

Nonpreemptive says, election only takes place in the beginning. So we turn on interface tracking to decrement our priority based on specific interfaces, we tie it to the protocol, then we give the standby router the means of taking over with preemption. When we do that we're sending up a pretty robust HSRP configuration that will allow us to have redundant layer three chassis that our clients are indirectly pointed to. And then, a fail over could happen when a chassis fails or even if smaller things, like interfaces are not affecting the HSRP group directly but indirectly affecting it based on changing of the priorities.

We can make HSRP controlled and redundant in such a way to handle these and give us tremendously high availability. And you can even go so far as to adjust the timers to be far more aggressive than the defaults. Those are things for another day, but you now have seen a great implementation of HSRP. Think back to our discussion on groups. We said, one active, one standby for a group.