CCNP Certification / BCMSN Test Tutorial: Getting going With HSRP
Described in RFC 2281, HSRP is actually a Cisco-proprietary protocol during which routers are set into an HSRP router team. In addition to dynamic routing protocols and STP, HSRP is taken into account a superior-availability network service, due to the fact all 3 have an Pretty much immediate cutover to the secondary path when the first path is unavailable.
One of 토토검증 several routers might be picked as the principal (“Active”, in HSRP terminology), and that Most important will cope with the routing even though the other routers are in standby, ready to handle the load if the main router gets to be unavailable. In this particular fashion, HSRP assures a high network uptime, because it routes IP traffic devoid of relying on one router.
The hosts employing HSRP as being a gateway don’t know the particular IP or MAC addresses of your routers in the group. They’re speaking by using a pseudorouter, a “Digital router” produced through the HSRP configuration. This virtual router should have a virtual MAC and IP adddress too.
The standby routers aren’t just likely to be sitting there, nevertheless! By configuring many HSRP groups on one interface, HSRP load balancing could be obtained.
Just before we reach the greater State-of-the-art HSRP configuration, we superior receive a simple 1 begun! We’ll be utilizing a two-router topology right here, and Take into account that a person or both of these routers may very well be multilayer switches too. For relieve of looking through, I’m planning to refer to them only as routers.
R2 and R3 will both of those be configured for being in standby group https://en.wikipedia.org/wiki/?search=먹튀검증 5. The Digital router will likely have an IP deal with of 172.12.23.ten /24. All hosts in VLAN a hundred should really 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 5 ip 172.12.23.ten
The demonstrate command for HSRP is display standby, and it’s the first command you must operate when configuring and troubleshooting HSRP. Permit’s operate it on the two routers and Look at outcomes.
R2#display standby
Ethernet0 – Team 5
Area point out is Standby, priority 100
Hellotime three sec, holdtime ten sec
Subsequent hi there sent in 0.776
Virtual IP handle is 172.twelve.23.10 configured
Energetic router is 172.12.23.3, priority one hundred expires in 9.568
Standby router is area
one state variations, final point out modify 00:00:22
R3#demonstrate standby
Local condition is Energetic, precedence one hundred
Future hi sent in two.592
Active router is community
Standby router is 172.twelve.23.two expires in eight.020
Virtual mac address is 0000.0c07.ac05
2 condition variations, final state change 00:02:08
We can easily see that R3 has long been picked because the Lively router (“nearby point out is Lively”), the virtual router’s IP is 172.twelve.23.10, and R2 is definitely the standby router.
There are some HSRP values that you choose to’ll need to have to change every now and then. Imagine if we wish R2 to be the Lively router rather? Can we change the MAC handle of the virtual router? I’ll response those thoughts in another section of the HSRP tutorial!