CCNP Certification / BCMSN Examination Tutorial: Getting going With HSRP
Defined in RFC 2281, HSRP is really a Cisco-proprietary protocol where routers are set into an HSRP router team. Along with dynamic routing protocols and STP, HSRP is considered a substantial-availability network services, given that all a few have an Nearly quick cutover to a secondary path when the primary route is unavailable.
Among the list of routers will probably be picked as the first (“Lively”, in HSRP terminology), Which Key will manage the routing even though the opposite routers are in standby, Completely ready to manage the load if the key router turns into unavailable. Within this vogue, HSRP assures a large community uptime, since it routes IP site visitors without depending on only one router.
The hosts applying HSRP for a gateway don’t know the actual IP or MAC 먹튀검증 addresses in the routers while in the team. They’re speaking that has a pseudorouter, a “Digital router” produced through the HSRP configuration. This virtual router will have a virtual MAC and IP adddress also.
The standby routers aren’t just gonna be sitting there, although! By configuring several HSRP groups on only one interface, HSRP load balancing could be reached.
Right before we reach the more advanced HSRP configuration, we superior receive a basic one commenced! We’ll be using a two-router topology here, and Remember the fact that 1 or each of these routers may very well be multilayer switches in addition. For ease of reading, I’m going to consult with them only as routers.
R2 and R3 will both be configured to generally be in standby team 5. The virtual router could have an IP handle of 172.12.23.ten /24. All hosts in VLAN one hundred should use this deal with as their default gateway.
R2(config)#interface ethernet0
R2(config-if)#standby 5 ip 172.twelve.23.ten
R3(config)#interface ethernet0
R3(config-if)#standby 5 ip 172.twelve.23.ten
The clearly show command for HSRP is demonstrate standby, and it’s the first command it is best to run though configuring and troubleshooting HSRP. Allow’s run it on equally routers and Review final results.
R2#present standby
Ethernet0 – Group five
Neighborhood state is Standby, precedence one hundred
Hellotime three sec, holdtime ten sec
Following hi there sent in 0.776
Virtual IP handle is 172.twelve.23.10 configured
Energetic router is 172.12.23.three, priority one hundred expires in 9.568
Standby router is nearby
1 condition adjustments, final point out transform 00:00:22
R3#exhibit standby
Local point out is Active, precedence one hundred
Next hi there sent in 2.592
Energetic router is nearby
Standby router is 172.12.23.two expires in 8.020
Digital mac tackle is 0000.0c07.ac05
2 point out modifications, past point out change 00:02:08
We can easily see that R3 continues to be picked as the Active router (“regional point out is Lively”), the Digital router’s IP is 172.twelve.23.ten, and R2 is the standby router.
There are several HSRP values that you simply’ll will need to alter every now and then. Let's say we wish R2 for being the Lively router rather? Can we change the MAC address on the virtual router? I’ll reply Those people queries in the subsequent portion of the HSRP tutorial!