You might have noticed that there is a track configuration stanza under the interface. If router a is the hsrp active router and then loses a link, which causes it to become standby router, and then the link comes back, the delay command causes router a to wait before it becomes active again. Catalyst 3750x and 3560x switch software configuration. Ill demonstrate one issue but the methodology to troubleshoot it can be used for a variety of hsrp issues. R1 should be the active router and r2 should be standby. Configure authentication for hsrp, use password vault. Hsrp stands for hot standby router protocol, and what it does is create a virtual ip address which hosts will use as the gateway address. Now weve been working through the theoryand talking about what everything does. This means that if the tracked interface of the active. If the link of the primary router goes down, the backup. C h a p t e r 441 catalyst 3750x and 3560x switch software configuration guide ol2152101 44 configuring hsrp this chapter describes how to use hot standby router protocol hsrp on the catalyst 3750x or 3560x switch to provide routing redundancy for routing ip traffic without being dependent on the availability of any single router. In computer networking, the hot standby router protocol hsrp is a cisco proprietary redundancy protocol for establishing a faulttolerant default gateway. Instructor hsrp gateway routers will often have redundant links back to the core of a network. Hsrp will provide the clients with uninterrupted access to servers of site b.
So with hsrp, short for hot standby router protocol, we are going to have two routers. Docs txtpdf draftlihsrp tracker diff1 diff2 ipr errata. And also noticed this when the hsrp state was checked. You can have multiple hsrp standby groups on the same interface. Lets get some hands on informationon how this all works. To provide redundancy, you also need to track the serial interfaces. Configure and cable the ethernet interfaces as indicated in the above diagram. Hot standby routing protocol hsrp lab hot standby routing protocol hsrp lab basic objectives. This can be useful for dual branch routers each with a single link back to the gateway. In this example, we have configured an hsrp group 1. In standby 1 track 100 command, 100 is the tracked object number, not the decrement value.
Hsrp configuration for multiple vlan on cisco 4506 switches. Learn how hsrp is activated on the network, and the specialized mac addresses used to facilitate functionality. This means that hsrp is monitoring the state of interface f10. Hsrp is a routing protocol that provides backup to a router in the event of failure. In particular, the protocol protects against the failure of the first hop router when the source host cannot learn the ip address of the first hop router dynamically. We will use the figure below as an example network topology. In particular, the protocol protects against the failure of the first hop router when the source host cannot learn. Jul 06, 2012 hot standby router protocol hsrp developed by cisco is used to provide layer 3 gateway redundancy. Recall that the interface with the highest priority is elected the active router. One router in hsrp primary or active state, another in standby hsrp state, all others in listen hsrp state. The protocol establishes an association between gateways in order to achieve default gateway failover if the primary gateway becomes. To configure the priority of a router from its default of 100.
It is a layer 3 protocol of the osi model, developed by cisco to provide redundancy at this level and at the gateway, between two or more cisco devices. In this step, you will configure hsrp and change the default gateway address on pca, pcc, s1, and s2 to the virtual ip address for hsrp. If you are using the cisco 3825 in a redundant configuration and are attaching the router to a device that uses spanning tree, configure port first on the device to avoid problems with hot standby router protocol hsrp at start up. Catalyst 3750x and 3560x switch software configuration guide, release 12. With vpc, only the active hsrp interface answers arp requests, but both hsrp interfaces active and standby can forward traffic. Hot standby router protocol hsrp developed by cisco is used to provide layer 3 gateway redundancy. Cisco me 3400e ethernet access switch software configuration guide ol1648505. One of the routers will be designated as the active gateway, and if its become unreachable there are other routers that ready to take its role as the active gateway. To accomplish this, r1 is selected as the primary router, and r2 is the secondary router. This section goes over the commands that are required, along with a sequence that can be used to configure them. Hot standby routing protocol hsrp is configured on the network to provide network redundancy for the ip traffic.
Unless otherwise noted, the term switch refers to a. The next section will go into some examples of how hsrp can be configured. Refer to the exhibit and the partial configuration on routers r1 and r2. Hsrp or hotstandby routing protocol is a mechanism developed by cisco to add redundancy at the gateway of a subnet. If a single redundant link fails, traffic may be completely unaffected, though in some cases it may severely impact the overall performance of traffic. The hot standby router protocol hsrp is a first hop redundancy protocol fhrp designed to allow for transparent failover of the firsthop ip device. This virtual address is free to move between configured. Hsrp is not a routing protocol as it does not advertise ip routes or affect the routing table in any way.
The standard router redundancy protocol which is used by other vendors is vrrp virtual router redundancy protocol, however cisco has created its own proprietary protocol hsrp which works very well on cisco routers. Load sharing with hsrp is achieved by creating multiple subinterfaces on the hsrp routers. For example, we might assign interface vlan 100 to hsrp group 100, and interface vlan 200 to hsrp group 200. The hot standby router protocol, hsrp, provides a mechanism which is designed to support nondisruptive failover of ip traffic in certain circumstances. Hot standby router protocol hsrp one picture summary.
Commonly found at the distribution layer, hsrp uses a virtual ip and mac address which a backup gateway will take control of in the event of failure. The configuration of gateway load balancing protocol glbp on cisco router is easy and very much similar to that of hot standby router protocol hsrp and virtual router redundancy protocol vrrp. This chapter describes how to use hot standby router protocol hsrp, virtual router redundancy protocol vrrp, and the gateway load balancing pr otocol glpb on the cisco me 3400e ethernet access switch. May 23, 2014 you might have noticed that there is a track configuration stanza under the interface. R1 becomes the active router via configuration of the hsrp priority. Build the network and verify connectivity in part 1, you will set up the network topology and configure basic settings, such as the interface ip addresses, static routing, device access, and passwords. Here you will find the startup configuration of each device. At a 3 second interval, routers send hsrp hello messages to become aware if the other is up or down between active and standby. This virtual ip will be used by all enddevices as their default gateway. For theory, i used cisco configuration guides and the cisco press official certification guide. Configure the virtual ip address of hsrp as default gateway on the host router. We will configure each router with unique physical ip but they must have the same group number and virtual ip. The virtual mac is a reserved address in the following format. Here we dont specify a decrement value so the default value will be used answer a is correct.
This address must be in the same subnet that is assigned to the lan interface where you want to run hsrp. Routers r1 and r2 have hsrp configured on lan side hsrp ip. And lets take a look at how you would configurea very basic configuration of hsrp with,if you look in the upper right hand side,those two routers in our. Interface tracking allows you to specify another interface on the router for the hsrp process to monitor in order to alter the hsrp priority for a given group. How to configure hsrp on a cisco router with gsn3 lab. Using hsrp, several routers are connected to the same segment of an ethernet, fddi or tokenring network and work together to present the appearance of a single virtual router on the lan. Hsrp hello packets are exchanged every 3 seconds holdtime 10 secs using multicast 224. How to configure gateway redundancy with hsrp in ios. The following is a typical hsrp configuration example. Glbp provides a standby ip just as hsrp, but it also provides multiple virtual mac addresses. The network administrator noticed that r2 does not became active when the r1 serial0 interface goes down. Then we can have 1 switch the active router for the hsrp group 100, and the other switch which would be active router for a hsrp group 200. In the above example we have two cisco 65 switches with sup 720 with ios 12.
The hosts that use the hsrp address as a gateway never know the actual physical ip or mac address of the routers in the group. Hsrp uses a virtual mac and ip address, which used in the event of a failure in any of the configured routers. Hsrp allows building resiliency in the network gateways wherein should an active router fail in a hsrp group, the standby router assumes the role of the active router and continue routing packets. The hold time value is 10 seconds or three times the hello timer. Discover how virtual router redundancy protocol vrrp. Configuring hsrp in cisco 6500 switches this document provides a sample configuration for hsrp in cisco 6500 series switches for high availability and for vlan redundancy. Gns3 labs for ccna hsrp configuration and verification. For example, you might configure an interface on switch 1 as an active router and. Cisco developed the proprietary hot standby router protocol hsrp to allow multiple. Therefore, the configuration to enable hsrp on r1 is as follows. Track interface fastethernet10 state up decrement 10. So our main focus here is just the active and the standby. In this example well take a look at troubleshooting hsrp.
View and download cisco wsc375048pss software configuration manual online. The default decrement priority value of hsrp is 10 so 1,5,20 are wrong values b, c and d are not correct. Now we could have more routers participating in the overall hsrp group were creating but they would have to wait on the sidelines. After configuration, give a few moment and use the show standby and show standby brief commands on r1 and r2 to verify that hsrp your configuration. This protocol is ciscoproprietary, but there is also a flavor for noncisco shops vrrp. Use the show standby brief command on r1 and r3 to view an hsrp status summary. Cisco proprietary protocol defined on rfc 2281 informational type vrrp virtual router redundancy protocol. Short for hot standby routing protocol, a proprietary protocol from cisco.
This document provides a sample configuration for hsrp in cisco 6500 series switches for high availability and for vlan redundancy. Only the virtual ip address that was created within the hsrp configuration along with a virtual mac address is known to other hosts on the network. Below is an example scenario showing how hsrp can be configured to meet the indirect link failures by use of ip sla configuration with hsrp. Siwtch a is active state of hsrp and switch b is in standby state. Hsrp provides high network availability by providing firsthop routing redundancy for ip hosts on networks configured with a default gateway ip address. Hot standbyroutingprotocol virtualrouterredundancyprotocol. Hsrp gives an administrator the ability to take link states into consideration, using the track command. Hsrp basic configuration hsrp is configured on the interface that is accepting traffic from hosts. Rtra will be configured as the active hsrp router by setting a higher hsrp priority. Hsrp configuration for multiple vlan on cisco 4506.
Cisco router hsrp configuration two examples hsrp hot standby router protocol is the cisco proprietary protocol for providing redundancy in router networks. For example on token ring, if source route bridging is in use, a rif will be stored with the virtual mac address. These hello messages are sent to the multicast address 224. Unless otherwise noted, the term switch refers to a catalyst 3750x. It is a layer 3 protocol of the osi model, developed by cisco to provide redundancy at this level and at the gateway, between two or more cisco devices hsrp uses a virtual mac and ip address, which used in the event. This address will serve as the default gateway address for all hosts on the lan. Hsrp allows building resiliency in the network gateways wherein should an active router fail in a hsrp group, the standby router assumes the. In this blog i will discuss the configuration of hot standby router protocol hsrp. Observe how hsrp is capable of doing limited load balancing. A few basic commands are used to configure hsrp on a device see table 1. Configure the ip addresses on the routers as follows.
R1 becomes the active router via configuration of the hsrp priority command. For example, with the standby preempt delay minimum 30 command, it waits for 30 seconds for the router to become active. Network configuration by interface disk partition layout installed software, with any significant configuration information hardware and peripherals inventory physical location of system authentication information method used, configurations for method, etc. Hsrp stands for hot standy routing protocol which provides automatic router backup when an active router in the group fails. Sep 11, 2018 catalyst 3750x and 3560x switch software configuration guide, release 12. Ensure you can ping the loopbacks of the isp router from the host router. This address is also referred to as the standby ip address. I used two cisco 3560 switches and gns3 to perform my labs. Hot standby router protocol, hsrp, is a cisco proprietary protocol to make multiple routers or. When the hsrp active routers f10 interface goes down, make sure its no longer the active hsrp router. Digital equipment corporation proprietary protocol. Rfc 2281 cisco hsrp march 1998 table of contents 1 introduction. Which two statements are true about the hot standby router protocol hsrp. I covered vrrp a few weeks back, which is a vendor neutral fhrp, but now lets take a look at hsrp which is more or less a cisco proprietary version of vrrp with the exception of the standby keyword this configuration is almost identical to our previous vrrp configuration, and the joy of this is the fact these commands pretty much mean and do the same thing.
Here you will find answers to hsrp questions part 3. Attach the devices as shown in the topology diagram, and cable as necessary. Iesg note this document reflects an existing deployed protocol. Cisco 3825 software configuration manual pdf download.
In this example, we will use two routers as member of hsrp group. Hsrp configuration we want switch sw2 to be active hsrp router for this topology, and the virtual ip address thats we gonna be servicing is 10. First hop redundancy protocols configuration guide, cisco ios xe release 3s. Hsrp is not a real routing protocol it just provides a default gateway at layer 2 and layer 3. Explore how tracking can be employed with preemption to allow the hot standby routing protocol hsrp group members to react to failed interfaces for optimal routing. The idea of hsrp is using multiple routers to serve as a gateway using one virtual ip address. Version 1 of the protocol was described in rfc 2281 in 1998. Hsrp configuration best cisco ccna ccnp and linuxcentos. Jun 21, 2010 configure authentication for hsrp, use password vault. This chapter describes how to use hot standby router protocol hsrp on the catalyst 3750x or 3560x switch to provide routing redundancy for routing ip traffic without being dependent on the availability of any single router. Hello, i built a int vlan with a vrf domain and a hsrp with a virtual gateway. Now lets start the configuration from interface f00 on r1.
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