CCNP Certification / BCMSN Exam Tutorial: Getting Started With HSRP
Outlined in RFC 2281, HSRP can be a Cisco-proprietary protocol by which routers are set into an HSRP router group. Along with dynamic routing protocols and STP, HSRP is considered a significant-availability network company, considering the fact that all three have an Just about immediate cutover to some secondary route when the principal path is unavailable.
Among the list of routers might be chosen as the first (“Active”, in HSRP terminology), and that Key will manage the routing even though the other routers are in standby, All set to deal with the load if the main router will become unavailable. With this vogue, HSRP makes certain a large network uptime, as it routes IP visitors without the need of counting on a single router.
The hosts applying HSRP being a gateway don’t know the particular IP or MAC addresses with the routers during the team. They’re speaking using a pseudorouter, a “Digital router” made from the HSRP configuration. This virtual router will likely have a Digital MAC and IP adddress at the same time.
The standby routers aren’t just gonna be sitting down there, while! By configuring several HSRP groups on a single interface, HSRP load balancing can be realized.
Before we get to the more Superior HSRP configuration, we improved have a primary one begun! We’ll be using a two-router topology right here, and Remember the fact that a single or both equally of these routers could possibly be multilayer switches as well. For ease of studying, I’m gonna consult with them only as routers.
R2 and R3 will equally be configured to get in standby team 5. The Digital router may have an IP tackle of 172.twelve.23.10 /24. All hosts in VLAN one hundred should use this handle as their default gateway.
R2(config)#interface ethernet0
R2(config-if)#standby five ip 172.twelve.23.10
R3(config)#interface ethernet0
R3(config-if)#standby five ip 172.12.23.10
The exhibit command for HSRP is clearly show standby, and it’s the 1st command you ought to operate although configuring and troubleshooting HSRP. Permit’s run it on each routers and Look at outcomes.
R2#display standby
Ethernet0 – Group five
Regional state is Standby, precedence a hundred
Hellotime 3 sec, holdtime 10 sec
Next howdy sent in 0.776
Digital IP deal with is 172.twelve.23.10 configured
Lively router is 172.twelve.23.3, precedence one hundred expires in nine.568
Standby router is local
1 condition improvements, last condition modify 00:00:22
R3#present standby
Community point out is Lively, priority 100
Up coming hi there sent in two.592
Lively router is regional
Standby router is 172.twelve.23.two expires in 8.020
Virtual mac handle is 0000.0c07.ac05
2 state changes, last point out adjust 00:02:08
We can see that R3 continues to be chosen 안전놀이터 because the Lively router (“neighborhood point out is Energetic”), the virtual router’s IP is 172.12.23.ten, and R2 is definitely the standby router.
There are a few HSRP values which you’ll require to change from time to time. Let's say we want R2 for being the Active router rather? Can we change the MAC address of the virtual router? I’ll respond to People queries in the next portion of this HSRP tutorial!