CCNP Certification / BCMSN Exam Tutorial: Getting going With HSRP
Outlined in RFC 2281, HSRP is a Cisco-proprietary protocol by which routers are put into an HSRP router team. In addition to dynamic routing protocols and STP, HSRP is considered a higher-availability community assistance, considering that all a few have an Nearly quick cutover into a 토토검증 secondary route when the primary path is unavailable.
One of many routers will be selected as the main (“Energetic”, in HSRP terminology), Which Major will cope with the routing when the other routers are in standby, ready to manage the load if the primary router gets to be unavailable. With this trend, HSRP makes certain a high community uptime, because it routes IP site visitors without having relying on an individual router.
The hosts utilizing HSRP to be a gateway don’t know the actual IP or MAC addresses of the routers while in the team. They’re communicating by using a pseudorouter, a “virtual router” established with the HSRP configuration. This virtual router will likely have a virtual MAC and IP adddress at the same time.
The standby routers aren’t just likely to be sitting down there, nevertheless! By configuring many HSRP groups on a single interface, HSRP load balancing can be realized.
Just before we reach the greater Innovative HSRP configuration, we much better have a primary a person started! We’ll be employing a two-router topology below, and keep in mind that one particular or both of those of those routers might be multilayer switches likewise. For relieve of looking through, I’m planning to refer to them only as routers.
R2 and R3 will both equally be configured being in standby team 5. The Digital router could have an IP tackle of 172.12.23.ten /24. All hosts in VLAN a hundred must use this deal with as their default gateway.
R2(config)#interface ethernet0
R2(config-if)#standby 5 ip 172.twelve.23.10
R3(config)#interface ethernet0
R3(config-if)#standby five ip 172.12.23.10
The clearly show command for HSRP is present standby, and it’s the first command you ought to run while configuring and troubleshooting HSRP. Let’s run it on equally routers and Assess effects.
R2#clearly show standby
Ethernet0 – Team 5
Regional condition is Standby, precedence 100
Hellotime 3 sec, holdtime 10 sec
Upcoming hello sent in 0.776
Virtual IP tackle is 172.12.23.10 configured
Lively router is 172.12.23.3, priority one hundred expires in 9.568
Standby router is community
one point out changes, final condition adjust 00:00:22
R3#display standby
Regional state is Active, precedence one hundred
Subsequent good day despatched in two.592
Active router is local
Standby router is 172.twelve.23.2 expires in 8.020
Digital mac deal with is 0000.0c07.ac05
two point out changes, past condition transform 00:02:08
We are able to see that R3 continues to be selected since the Lively router (“regional point out is Energetic”), the virtual router’s IP is 172.twelve.23.10, and R2 is definitely the standby router.
There are a few HSRP values that you’ll require to alter occasionally. Imagine if we would like R2 to be the Energetic router instead? Can we change the MAC handle from the virtual router? I’ll answer People queries in the following element of the HSRP tutorial!