CCNP Certification / BCMSN Test Tutorial: Starting out With HSRP
Defined in RFC 2281, HSRP can be a Cisco-proprietary protocol by which routers are set into an HSRP router group. Coupled with dynamic routing protocols and STP, HSRP is taken into account a significant-availability network assistance, since all three have an Just about speedy cutover to some secondary route when the 토토검증 principal route is unavailable.
One of many routers will likely be picked as the first (“Active”, in HSRP terminology), and that Principal will tackle the routing even though the opposite routers are in standby, All set to handle the load if the first router gets unavailable. Within this trend, HSRP ensures a large community uptime, as it routes IP targeted traffic with out depending on just one router.
The hosts working with HSRP being a gateway don’t know the actual IP or MAC addresses of your routers within the group. They’re speaking which has a pseudorouter, a “virtual router” designed with the HSRP configuration. This virtual router will likely have a virtual MAC and IP adddress too.
The standby routers aren’t just likely to be sitting there, even though! By configuring several HSRP groups on a single interface, HSRP load balancing can be obtained.
Ahead of we reach the more State-of-the-art HSRP configuration, we improved get yourself a primary one began! We’ll be utilizing a two-router topology listed here, and Remember that one particular or equally of those routers may be multilayer switches as well. For relieve of looking at, I’m about to make reference to them only as routers.
R2 and R3 will both of those be configured to be in standby team five. The virtual router may have an IP deal with of 172.12.23.ten /24. All hosts in VLAN a hundred should use this tackle 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.twelve.23.ten
The demonstrate command for HSRP is demonstrate standby, and it’s the primary command you ought to operate whilst configuring and troubleshooting HSRP. Enable’s operate it on equally routers and Look at success.
R2#display standby
Ethernet0 – Group 5
Nearby condition is Standby, precedence a hundred
Hellotime 3 sec, holdtime ten sec
Future hello despatched in 0.776
Digital IP deal with is 172.twelve.23.10 configured
Lively router is 172.twelve.23.three, precedence one hundred expires in nine.568
Standby router is area
1 state improvements, final state modify 00:00:22
R3#clearly show standby
Nearby condition is Energetic, priority one hundred
Following hello there sent in 2.592
Lively router is local
Standby router is 172.twelve.23.two expires in 8.020
Virtual mac address is 0000.0c07.ac05
two state changes, past state improve 00:02:08
We could see that R3 is chosen as being the Active router (“nearby state is Lively”), the virtual router’s IP is 172.twelve.23.10, and R2 is the standby router.
There are numerous HSRP values that you just’ll need to change occasionally. What if we would like R2 for being the Lively router in its place? Can we change the MAC handle of your Digital router? I’ll remedy those thoughts in the following component of this HSRP tutorial!