CCNP Certification / BCMSN Examination Tutorial: Starting out With HSRP
Outlined in RFC 2281, HSRP is actually a Cisco-proprietary protocol wherein routers are put into an HSRP router group. Coupled with dynamic routing protocols and STP, HSRP is taken into account a significant-availability network support, considering the fact that all 3 have an Pretty much immediate cutover to a secondary route when the main route is unavailable.
On the list of routers will be picked as the main (“Active”, in HSRP terminology), Which Key will cope with the routing when one other routers are in standby, Prepared to manage the load if the key router will become unavailable. During this trend, HSRP ensures a large community uptime, since it routes IP targeted traffic without relying on a single router.
The hosts employing HSRP as a gateway don’t know the actual IP or MAC addresses in the routers from the team. They’re communicating that has a pseudorouter, a “Digital router” made with the HSRP configuration. This virtual router could have a virtual MAC and IP adddress also.
The standby routers aren’t just likely to be sitting there, even though! By configuring multiple HSRP teams on just one interface, HSRP load balancing is often realized.
Before we reach the more advanced HSRP configuration, we greater receive a fundamental 1 started off! We’ll be employing a two-router topology below, and Remember the 먹튀검증 fact that 1 or the two of those routers could be multilayer switches likewise. For ease of looking at, I’m intending to check with them only as routers.
R2 and R3 will each be configured for being in standby team five. The virtual router can have an IP tackle of 172.12.23.ten /24. All hosts in VLAN 100 should really use this handle as their default gateway.
R2(config)#interface ethernet0
R2(config-if)#standby 5 ip 172.12.23.ten
R3(config)#interface ethernet0
R3(config-if)#standby 5 ip 172.twelve.23.ten
The clearly show command for HSRP is present standby, and it’s the primary command it is best to operate though configuring and troubleshooting HSRP. Let’s operate it on both of those routers and compare final results.
R2#present standby
Ethernet0 – Team five
Community point out is Standby, precedence 100
Hellotime three sec, holdtime 10 sec
Up coming howdy sent in 0.776
Virtual IP handle is 172.twelve.23.ten configured
Active router is 172.12.23.3, precedence one hundred expires in nine.568
Standby router is neighborhood
one condition adjustments, previous point out transform 00:00:22
R3#exhibit standby
Nearby condition is Energetic, precedence one hundred
Following howdy sent in 2.592
Active router is neighborhood
Standby router is 172.twelve.23.two expires in 8.020
Virtual mac handle is 0000.0c07.ac05
2 point out improvements, final state improve 00:02:08
We will see that R3 is picked as being the Active router (“regional state is Energetic”), the Digital router’s IP is 172.12.23.ten, and R2 may be the standby router.
There are a few HSRP values that you choose to’ll have to have to alter every now and then. What if we would like R2 to generally be the Lively router as an alternative? Can we change the MAC handle of your virtual router? I’ll reply People thoughts in the subsequent part of the HSRP tutorial!