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CCNP Certification / BCMSN Exam Tutorial: Getting going With HSRP

Defined in RFC 2281, HSRP can be a Cisco-proprietary protocol by which routers are place into an HSRP router team. Along with dynamic routing protocols and STP, HSRP is considered a significant-availability network provider, because all 3 have an Virtually immediate cutover to your secondary path when the main route is unavailable.

Among the routers might be picked as the key (“Energetic”, in HSRP terminology), and that Key will cope with the routing although another routers are in standby, Completely ready to handle the load if the key router gets unavailable. Within this style, HSRP makes sure a superior community uptime, since it routes IP visitors without having relying on only one router.

The hosts working with HSRP being a gateway don’t know the particular IP or MAC addresses of your routers from the group. They’re speaking that has a pseudorouter, a “Digital router” designed by the HSRP configuration. This virtual router will likely have a virtual MAC and IP adddress as well.

The standby routers aren’t just gonna be sitting down there, while! By configuring many HSRP teams on one interface, HSRP load balancing may be obtained.

Ahead of we get to the more advanced HSRP configuration, we superior have a simple 1 begun! We’ll be utilizing a two-router topology in this article, and Remember the fact that one or both of those of such routers could be multilayer switches also. For simplicity of studying, I’m likely to check with them only as routers.

R2 and R3 will the two be configured being in standby group five. The Digital router will likely have an IP deal with of 172.twelve.23.ten /24. All hosts in VLAN 100 ought to use this tackle as their default gateway.

R2(config)#interface ethernet0

R2(config-if)#standby five ip 172.12.23.ten

R3(config)#interface ethernet0

R3(config-if)#standby five ip 172.twelve.23.10

The show command for HSRP is present standby, and it’s the initial command you need to operate though configuring and troubleshooting 안전놀이터 HSRP. Permit’s run it on both of those routers and Look at effects.

R2#present standby

Ethernet0 – Group 5

Local point out is Standby, priority one hundred

Hellotime three sec, holdtime ten sec

Upcoming good day despatched in 0.776

Digital IP address is 172.12.23.ten configured

Energetic router is 172.12.23.three, priority one hundred expires in 9.568

image

Standby router is regional

1 point out alterations, final point out adjust 00:00:22

R3#clearly show standby

Area point out is Energetic, precedence one hundred

Next hello there sent in two.592

Lively router is area

Standby router is 172.twelve.23.2 expires in 8.020

Virtual mac deal with is 0000.0c07.ac05

two point out alterations, last state adjust 00:02:08

We can see that R3 has become selected given that the Lively router (“nearby state is Energetic”), the Digital router’s IP is 172.twelve.23.10, and R2 would be the standby router.

Usually there are some HSRP values that you simply’ll want to vary occasionally. What if we want R2 to generally be the Lively router in its place? Can we change the MAC tackle of the virtual router? I’ll respond to Individuals questions in the following element of the HSRP tutorial!