CCNP Certification / BCMSN Exam Tutorial: Getting Started With HSRP
Described in RFC 2281, HSRP is really a Cisco-proprietary protocol where routers are set into an HSRP router team. Coupled with dynamic routing protocols and STP, HSRP is taken into account a high-availability network provider, given that all 3 have an Just about fast cutover to your secondary route when the main path is unavailable.
Among the routers will likely be chosen as the key (“Lively”, in HSRP terminology), Which Principal will deal with the routing whilst the opposite routers are in standby, All set to manage the load if the key router gets unavailable. Within this manner, HSRP ensures a large network uptime, since it routes IP targeted visitors with out depending on one router.
The hosts utilizing HSRP like a gateway don’t know the actual IP or MAC addresses of your routers while in the group. They’re speaking with a pseudorouter, a “virtual router” produced because of the HSRP configuration. This Digital router will likely have a virtual MAC and IP adddress also.
The standby routers aren’t just gonna be sitting there, even though! By configuring many HSRP groups on an individual interface, HSRP load balancing is usually obtained.
In advance of we get to the greater Innovative HSRP configuration, we better get yourself a fundamental a single started! We’ll be utilizing a two-router topology below, and Understand that one particular or equally of such routers may very well be multilayer switches also. For relieve of looking through, I’m planning to consult with them only as routers.
R2 and R3 will both of those be configured to become in standby group five. The virtual router could have an IP handle of 172.twelve.23.ten /24. All hosts in VLAN one hundred must use this deal with 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 five ip 172.twelve.23.ten
The demonstrate command for HSRP is clearly show 안전놀이터 standby, and it’s the main command you must run while configuring and troubleshooting HSRP. Permit’s operate it on each routers and Review effects.
R2#demonstrate standby
Ethernet0 – Group five
Neighborhood condition is Standby, precedence a hundred
Hellotime three sec, holdtime ten sec
Future good day sent in 0.776
Digital IP tackle is 172.twelve.23.10 configured
Active router is 172.12.23.3, priority a hundred expires in nine.568
Standby router is local
one condition adjustments, final state change 00:00:22
R3#display standby
Regional state is Active, precedence a hundred
Subsequent howdy despatched in two.592
Energetic router is community
Standby router is 172.12.23.two expires in eight.020
Digital mac deal with is 0000.0c07.ac05
2 point out adjustments, past condition modify 00:02:08
We can see that R3 has become picked given that the Active router (“area point out is Active”), the virtual router’s IP is 172.twelve.23.10, and R2 may be the standby router.
There are a few HSRP values that you just’ll want to vary on occasion. Imagine if we wish R2 to become the Active router as an alternative? Can we change the MAC tackle with the virtual router? I’ll solution those queries in the following aspect of this HSRP tutorial!