CCNP Certification / BCMSN Exam Tutorial: Getting Started With HSRP
Described in RFC 2281, 먹튀검증 HSRP is actually a Cisco-proprietary protocol where routers are place into an HSRP router group. Together with dynamic routing protocols and STP, HSRP is taken into account a high-availability community services, because all 3 have an Pretty much immediate cutover to a secondary route when the key path is unavailable.
On the list of routers might be picked as the principal (“Energetic”, in HSRP terminology), Which Main will deal with the routing though one other routers are in standby, All set to handle the load if the primary router gets unavailable. With this manner, HSRP guarantees a superior community uptime, because it routes IP visitors without relying on a single router.
The hosts applying HSRP for a gateway don’t know the actual IP or MAC addresses in the routers while in the team. They’re speaking using a pseudorouter, a “virtual router” designed from the HSRP configuration. This Digital router can have a virtual MAC and IP adddress as well.
The standby routers aren’t just going to be sitting there, nevertheless! By configuring numerous HSRP groups on one interface, HSRP load balancing is usually achieved.
Ahead of we reach the more State-of-the-art HSRP configuration, we much better get a basic 1 started off! We’ll be utilizing a two-router topology below, and Understand that one particular or each of such routers may be multilayer switches also. For relieve of reading, I’m gonna confer with them only as routers.
R2 and R3 will the two be configured to be in standby group 5. The Digital router can have an IP address of 172.12.23.ten /24. All hosts in VLAN a hundred need to use this address as their default gateway.
R2(config)#interface ethernet0
R2(config-if)#standby five ip 172.twelve.23.ten
R3(config)#interface ethernet0
R3(config-if)#standby five ip 172.twelve.23.ten
The display command for HSRP is display standby, and it’s the initial command you ought to operate though configuring and troubleshooting HSRP. Permit’s run it on both of those routers and Examine final results.
R2#show standby
Ethernet0 – Group 5
Nearby condition is Standby, priority one hundred
Hellotime three sec, holdtime ten sec
Subsequent hi despatched in 0.776
Digital IP handle is 172.twelve.23.10 configured
Energetic router is 172.12.23.3, priority 100 expires in 9.568
Standby router is neighborhood
one condition modifications, past state modify 00:00:22
R3#present standby
Regional condition is Lively, precedence one hundred
Upcoming hello despatched in 2.592
Energetic router is nearby
Standby router is 172.twelve.23.2 expires in 8.020
Digital mac deal with is 0000.0c07.ac05
2 condition modifications, very last state modify 00:02:08
We will see that R3 is selected given that the Lively router (“regional point out is Active”), the virtual router’s IP is 172.12.23.10, and R2 will be the standby router.
There are numerous HSRP values that you’ll need to change every now and then. What if we want R2 being the Lively router as a substitute? Can we alter the MAC deal with with the Digital router? I’ll reply those thoughts in the following section of the HSRP tutorial!