CCNP Certification / BCMSN Examination Tutorial: Getting Started With HSRP
Described in RFC 2281, HSRP is really a Cisco-proprietary protocol during which routers are place into an HSRP router group. In conjunction with dynamic routing protocols and STP, HSRP is taken into account a higher-availability network support, given that all 3 have an Pretty much immediate cutover to some secondary path when the first path is unavailable.
Among the routers are going to be selected as the key (“Energetic”, in HSRP terminology), Which Principal will manage the routing although one other routers are in standby, ready to deal with the load if the primary router gets unavailable. On this trend, HSRP makes certain a substantial network uptime, since it routes IP website traffic with out relying on only one router.
The hosts making use of HSRP as a gateway don’t know the particular IP or MAC addresses from the routers during the group. They’re communicating by using a pseudorouter, a “Digital router” produced because of the HSRP configuration. This Digital router should have a virtual MAC and IP adddress in addition.
The standby routers aren’t just destined to be sitting down there, 먹튀검증업체 though! By configuring numerous HSRP groups on a single interface, HSRP load balancing is usually attained.
In advance of we get to the more Superior HSRP configuration, we greater get a standard a single begun! We’ll be employing a two-router topology right here, and Remember that 1 or both of those of those routers could possibly be multilayer switches as well. For simplicity of looking through, I’m planning to seek advice from them only as routers.
R2 and R3 will both of those be configured being in standby team five. The Digital router could have an IP deal with of 172.twelve.23.10 /24. All hosts in VLAN a hundred should really use this tackle 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.ten
The present command for HSRP is display standby, and it’s the main command it is best to operate when configuring and troubleshooting HSRP. Permit’s operate it on both equally routers and Assess effects.
R2#display standby
Ethernet0 – Team 5
Neighborhood condition is Standby, precedence one hundred
Hellotime three sec, holdtime ten sec
Upcoming hello there sent in 0.776
Digital IP handle is 172.twelve.23.10 configured
Lively router is 172.twelve.23.three, priority a hundred expires in 9.568
Standby router is community
1 state variations, last point out improve 00:00:22
R3#clearly show standby
Nearby point out is Lively, precedence a hundred
Up coming howdy sent in 2.592
Active router is community
Standby router is 172.twelve.23.2 expires in 8.020
Digital mac handle is 0000.0c07.ac05
2 point out changes, final point out change 00:02:08
We can easily see that R3 continues to be picked as the Lively router (“nearby state is Energetic”), the Digital router’s IP is 172.twelve.23.10, and R2 is definitely the standby router.
There are many HSRP values that you choose to’ll want to vary occasionally. Let's say we want R2 being the Active router in its place? Can we alter the MAC address with the Digital router? I’ll response These thoughts in the next portion of the HSRP tutorial!