CCNP Certification / BCMSN Test Tutorial: Getting going With HSRP
Described in RFC 2281, HSRP is really a Cisco-proprietary protocol through which routers are put into an HSRP router group. As well as dynamic routing protocols and STP, HSRP is taken into account a substantial-availability network service, given that all a few have an Pretty much immediate cutover to some secondary route when the primary path is unavailable.
Among the list of routers are going to be chosen as the first (“Energetic”, in HSRP terminology), Which Principal will take care of the routing while the other routers are in standby, All set to handle the load if the primary router gets unavailable. With this style, HSRP makes certain a superior community uptime, because it routes IP targeted visitors without having depending on a single router.
The hosts working with HSRP like a gateway don’t know the actual IP or MAC addresses from the routers in the team. They’re speaking having a pseudorouter, a “Digital router” developed because of the HSRP configuration. This virtual router can have a Digital MAC and IP adddress likewise.
The standby routers aren’t just gonna be sitting down there, while! By configuring a number of HSRP teams on a single interface, HSRP load balancing may be achieved.
Right before we get to the greater Sophisticated HSRP configuration, we much better receive a standard one began! We’ll be using a two-router topology right here, 먹튀검증 and keep in mind that a person or the two of those routers may be multilayer switches also. For simplicity of studying, I’m gonna seek advice from them only as routers.
R2 and R3 will both of those be configured being in standby team five. The virtual router will have an IP tackle of 172.12.23.ten /24. All hosts in VLAN 100 should really use this tackle as their default gateway.
R2(config)#interface ethernet0
R2(config-if)#standby 5 ip 172.12.23.10
R3(config)#interface ethernet0
R3(config-if)#standby 5 ip 172.twelve.23.10
The present command for HSRP is clearly show standby, and it’s the initial command you ought to operate whilst configuring and troubleshooting HSRP. Enable’s operate it on the two routers and Evaluate results.
R2#present standby
Ethernet0 – Group five
Community state is Standby, precedence one hundred
Hellotime three sec, holdtime ten sec
Next good day despatched in 0.776
Digital IP tackle is 172.12.23.10 configured
Energetic router is 172.twelve.23.3, priority 100 expires in nine.568
Standby router is neighborhood
one point out adjustments, final point out adjust 00:00:22
R3#clearly show standby
Nearby condition is Energetic, priority one hundred
Next good day despatched in 2.592
Energetic router is community
Standby router is 172.twelve.23.two expires in 8.020
Digital mac handle is 0000.0c07.ac05
two point out alterations, past state alter 00:02:08
We are able to see that R3 has been picked since the Energetic router (“nearby point out is Lively”), the Digital router’s IP is 172.12.23.10, and R2 would be the standby router.
There are numerous HSRP values that you simply’ll need to have to vary from time to time. What if we would like R2 being the Energetic router as a substitute? Can we alter the MAC deal with with the virtual router? I’ll answer All those issues in the following element of the HSRP tutorial!