CCNP Certification / BCMSN Test Tutorial: Getting going With HSRP
Defined in RFC 2281, HSRP is really a Cisco-proprietary protocol through 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 community company, considering 토토사이트 the fact that all a few have an Nearly immediate cutover to your secondary route when the main path is unavailable.
Among the list of routers will likely be picked as the first (“Active”, in HSRP terminology), Which Principal will deal with the routing whilst one other routers are in standby, Prepared to manage the load if the main router gets unavailable. During this vogue, HSRP guarantees a higher network uptime, since it routes IP targeted traffic without the need of relying on just one router.
The hosts making use of HSRP being a gateway don’t know the particular IP or MAC addresses in the routers during the group. They’re communicating with a pseudorouter, a “Digital router” produced with the HSRP configuration. This virtual router should have a virtual MAC and IP adddress as well.
The standby routers aren’t just gonna be sitting down there, nevertheless! By configuring a number of HSRP groups on only one interface, HSRP load balancing can be realized.
Prior to we reach the greater State-of-the-art HSRP configuration, we far better get yourself a essential just one begun! We’ll be utilizing a two-router topology below, and Remember that a single or both equally of these routers might be multilayer switches as well. For relieve of reading through, I’m gonna refer to them only as routers.
R2 and R3 will both of those be configured to get in standby team 5. The virtual router could have an IP deal with of 172.twelve.23.10 /24. All hosts in VLAN a hundred must use this deal with 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 5 ip 172.12.23.ten
The demonstrate command for HSRP is show standby, and it’s the initial command you must run whilst configuring and troubleshooting HSRP. Enable’s operate it on both routers and Assess effects.
R2#present standby
Ethernet0 – Group 5
Neighborhood condition is Standby, priority one hundred
Hellotime three sec, holdtime ten sec
Subsequent hello there despatched in 0.776
Virtual IP tackle is 172.twelve.23.10 configured
Lively router is 172.twelve.23.3, precedence a hundred expires in nine.568
Standby router is local
one condition alterations, final condition modify 00:00:22
R3#display standby
Regional condition is Lively, precedence a hundred
Up coming hello despatched in 2.592
Active router is area
Standby router is 172.twelve.23.two expires in eight.020
Digital mac tackle is 0000.0c07.ac05
2 state alterations, last point out change 00:02:08
We can see that R3 has long been selected as being the Energetic router (“neighborhood point out is Active”), the virtual router’s IP is 172.twelve.23.ten, and R2 would be the standby router.
There are many HSRP values which you’ll will need to change once in a while. What if we want R2 to be the Active router in its place? Can we alter the MAC address of the Digital router? I’ll answer those questions in the following section of this HSRP tutorial!