Cisco hsrp configuration with example icnd2 200105. Lets take a look at a configuration example so you can see how this works. Hsrp stands for hot standy routing protocol which provides automatic router backup when an active router in the group fails. In this example, we have configured an hsrp group 1. 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. It does, but both softwares are very particular about what they require for it to work. Vrrp stands for virtual route rendundancy protocol. You need to register to download the gns3 topology file. Election of an active and standby hsrp router is based on a priority value of 0 through 255. Hsrp configuration on cisco router using cisco packet. The virtual address mac and ip become the logical gateway for lan users.
Hot standby router protocol hsrp one picture summary. Hsrp detects when the designated active router fails, and a selected standby router assumes control of. Make sure the router with highest priority will always be the active router. This is useful as it will tell us if the router is a master or a slave, what the virtual ip address and mac address is as well as other configurable settings for vrrp. Hsrp configuration on gns3 is a continuation of our ccna gns3 labs for cisco ios. The traffic is always go to the virtual ip address, virtual gateway. In hsrp vesion 1, the virtual mac address has a format. Configuring hsrp this chapter describes how to use hot standby router protocol hsrp on the catalyst 3560 switch to. Hsrp version 2 expands the group number range from 0 to 4095. Learn how hsrp is activated on the network, and the specialized mac addresses used to facilitate functionality. There are a couple of other interesting things to check, take a look below. Hsrp vs vrrp protocols compared and explained routerfreak. Hsrp version 2 uses the new ip multicast address 224. 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.
When i have 2 or more router in a subnet i can configure them for hot standby router configuration hsrp to achieve router redundancy or next hop redundancy. Gns3 the software that empowers network professionals. Hsrp and glbp any of you that are using gns3 and happen to be having trouble getting the devices to talk to one another and become activestandby and it. 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. Hsrp or hot standby routing protocol provides network redundancy solutions to routers. Failover works ok except i cant control the timers. For example, we might assign interface vlan 100 to hsrp group 100, and interface vlan 200 to hsrp group 200. You must configure each gateway in a glbp group with the same group number, and at least one gateway in the read more. Configuring hsrp on gns3 and cisco iou part 3 youtube. Hsrp allows building resiliency in the network gateways wherein should an active router fail in a hsrp group, the standby router assumes the. For theory, i used cisco configuration guides and the cisco press official certification guide. Glbp stands for gateway load balancing protocol and just like hsrp vrrp it is used to create a virtual.
Newjersey should be the active router, when it fails l. Hsrp feature has been introduced in packet tracer 6. Hsrp preemption and interface tracking are supported in packet tracer 7. With the unrelenting advance of ipv6 into todays networks, i thought i would reexamine this topic in such an environment. But under the covers there are some significant differences. Hsrp hello packets are exchanged every 3 seconds holdtime 10 secs using multicast 224. Hot standby router protocol hsrp is a cisco proprietary first hop redundancy protocol fhrp. See the configuring mhsrp section on page 110 for the example configuration steps. Catalyst 3750x and 3560x switch software configuration.
The main disadvantage of hsrp and vrrp is that only one gateway is elected to be the active gateway and used to forward traffic whilst the rest are unused until the active one fails. In the next video i will continue to finish the last video in the series. This protocol can be configured on every cisco router available in packet tracer as well as on cisco catalyst 3560 layer 3 switch. Therefore, the configuration to enable hsrp on r1 is as follows. Well similarly we can have different hsrp groups for different vlans. In this video, jeremy cioara explains configuring hsrp.
Now we could have more routers participating in the overall hsrp group were creating but they would have to wait on the sidelines. The version of an hsrp group can be changed from hsrpv2 to hsrpv1 only if the group number is less than 256. If you change the hsrp version on an interface, each hsrp group resets because it now has a new virtual mac address. If you dont know why we use virtual gateways then i suggest to read my introduction to virtual gateways first. In this article i will explain you what is hsrp hot standby router protocol and how to configure and use it. The protocol establishes a framework between network routers in order to achieve default gateway failover if the primary gateway becomes inaccessible, in close association with. Only on mixed stacks of catalyst 3750x or catalyst 3750e and 3750 switches. After leaving configuration mode we can do the show vrrp command which will give us information on the current vrrp status.
So our main focus here is just the active and the standby. For example, in our sample scenario, if we bring the fa00 of r1 back up, r1 will become the. Hot standby routing protocol is configured on an intercity network and you are responsible for the configuration. 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 the above example we have two cisco 65 switches with sup 720 with ios 12. Hot standby router protocol configuration on cisco router. The standby mode of preempt, makes the router with the highest priority becomes the active router. For example, if you configure hsrp group 0 on vlan 1 and on port 1, the switch counts this as. What is the mac address for the virtual ip address. Configure authentication for hsrp, use password vault. Hot standby router protocol hsrp is a cisco proprietary redundancy protocol for establishing a faulttolerant default gateway.
For an unknown reason, the following commands are automatically added by gns3 each time you define an hsrp group on a svi with a non default priority. This address will serve as the default gateway address for all hosts on the lan. Configure the virtual ip address of hsrp as default gateway on the host router. Hsrp need to be configured on routed network segment routers and l3 switches and it provides a virtual mac media access control address and an ip address that is single address shared between a group of hsrp configured routers and switches. For example, i have set on both routers hello time 1 sec, hold time 10 sec i test the failover by shutting down the interface f00 set for hsrp, not the the track interface. Hsrp allows multiple routers to be configured with the virtual ip default gateway. Hsrp configuration best cisco ccna ccnp and linuxcentos. Figure 1blog continue reading configuring hsrp for ipv6 on cisco networks. This video explains you how to solve the hot standby routing protocol hsrp lab found on gns3vault. What i think hsrp is both layer 3 and layer2 because what it does is the same thing does the arp and proxy arp, but as per the operation if you see w it works on layer 3 and provides a standby ip address for hosts on that network to use as their gateway or other routers to use as a nexthop for a route. In the event that both priorities are the same, then the router with the highest ip address will become the active router. For example, new mac address range will be used, 0000. An hsrp ipv6 group has a virtual mac address that is derived from the hsrp group number, and a virtual ipv6 linklocal address that is, by default, derived from the hsrp virtual mac address. The differences between hsrp versus vrrp are very slight especially when looking at the basic configuration side by side.
Hot standby routing protocol hsrp lab in gns3 youtube. Cisco router hsrp configuration two examples hsrp hot standby router protocol is the cisco proprietary protocol for providing redundancy in router networks. When the hsrp active routers f10 interface goes down, make sure its no longer the active hsrp router. Configuring hsrp for ipv6 on cisco networks interface. Hot standby router protocol, hsrp, is a cisco proprietary protocol to make multiple routers or switches appear as one gateway. Marketplace configure a small network with hsrp and ospf gns3.
Since mac addresses are in hexadecimal format, this translates to the number 100 in decimal. With hot standby router protocol mechanism, even if a failure occurs on one device in the hsrp group, then the traffic goes through on another device in that group, through an alternative path hot standby router protocol provides this by using a virtual ip address and a mac address as a gateway of multiple path alternatives. While it is possible to configure a plaintext password, the example. How to configure gateway redundancy with hsrp in ios. Intervlan routing problem using hsrp with multiple vlans. 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. I will show you how to configure intervlan routing. Ive got a simple lab, 2 routers c3640 setup with hsrp on which i test hsrp failover time. I am trying above sceanrio in gns3, in that routers are used as pcs and configured default gateway as virtual ip of the respective vlan virtual ips. Ensure you can ping the loopbacks of the isp router from the host router.
Hsrp is designed to provide only a virtual first hop for ipv6 hosts. Hsrp is mainly used in the perimeter network or in a network where highavailable is a must or has zero tolerance to network downtime. Ive tried to configure hsrp on my labs but with no luck. 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.
Lots of people have said that hsrp does not work in either gns3 or iou. By configuring hsrp in a number of routers in a network you can offer your customers the opportunity to enjoy seamless network or internet access opportunity. For example, hsrp group 10 uses the hsrp virtual mac address of 0000. Gns3 labs for ccna hsrp configuration and verification.
Also make sure you check the hsrp lesson first since many of the things i describe there also apply to vrrp. Ccna labs hsrp configuration on gns3 and packet tracer. Gateway load balancing protocol glbp is a cisco proprietary protocol and performs the similar function to hsrp and vrrp but it supports load balancing among. Network redundancy configuration on cisco router with hsrp. Unless otherwise noted, the term switch refers to a catalyst 3750x or 3560x standalone switch and to a catalyst 3750x switch stack. Glbp provides a single virtual ip address with multiple virtual mac addresses. Acxx, where xx is the hsrp group number in hexadecimal based on the respective interface. Vrrp virtual router redundancy protocol is very similar to hsrp hot standby routing protocol and can be used to create a virtual gateway. So with hsrp, short for hot standby router protocol, we are going to have two routers. In this article, i add statefull nat to my previous mhsrp configuration. We will use the figure below as an example network topology.
In this post, we will look at how to configure hsrp on cisco iou and on gns3. Posted by rene molenaar september 3, 2012 in troubleshooting. 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. One router in hsrp primary or active state, another in standby hsrp state, all others in listen hsrp state. I will explain all hsrp commands along with hsrp metrics and configuration in few simple steps. That mac it cant locate is associated with the multicast ip of 224. Observe how hsrp is capable of doing limited load balancing. In a previous blog i discussed configuring hsrp in an ipv4 network. In this video i configured trunking and etherchannel in our topology. For instructorled cisco training see our ccna class schedule. The virtual mac address used by hsrp v1 starts with 0000. Rtra will be configured as the active hsrp router by setting a higher hsrp priority. Glbp is a more advanced version of hot standby router protocol. Figure 1 shows the topology i will be using for this blog.
Hsrp configuration on gns3 is a continuation of our ccna gns3 labs for cisco. The example set by gns3 tool, has the following schema. This means that if the tracked interface of the active. 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. Here is some explanation about hsrp i took from wikipedia. I used two cisco 3560 switches and gns3 to perform my labs.
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