CCNP Certification / BCMSN Test Tutorial: Getting going With HSRP
Described in RFC 2281, HSRP can be a Cisco-proprietary protocol wherein routers are put into an HSRP router group. Together with dynamic routing protocols and STP, HSRP is considered a substantial-availability network provider, considering that all 3 have an almost speedy cutover to a secondary path when the first path is unavailable.
Among the list of routers will likely be chosen as the main (“Energetic”, in HSRP terminology), and that Major will cope with the routing when one other routers are in standby, Prepared to handle the load if the principal router gets to be unavailable. With this fashion, HSRP ensures a superior network uptime, since it routes IP website traffic without having counting on only one router.
The hosts utilizing HSRP being a gateway don’t know the particular IP or MAC addresses in the routers inside the team. They’re communicating having a pseudorouter, a “Digital router” designed from the HSRP configuration. This Digital router can have a Digital MAC and IP adddress as well.
The standby routers aren’t just destined to be sitting down there, even though! By configuring a number of HSRP teams on just one interface, HSRP load balancing could be achieved.
Just before we reach the more Highly developed HSRP configuration, we better get a primary one particular started out! We’ll be employing a two-router topology listed here, and keep in mind that a person or the two of these routers could possibly be multilayer switches in addition. For simplicity of reading, I’m planning to check with them only as routers.
R2 and R3 will both of those be configured to become in standby team 5. The Digital router can have an IP deal with of 172.12.23.ten /24. All 토토먹튀 hosts in VLAN 100 really should 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.23.10
The show command for HSRP is clearly show standby, and it’s the first command you'll want to operate though configuring and troubleshooting HSRP. Permit’s run it on both routers and Review results.
R2#demonstrate standby
Ethernet0 – Group 5
Area state is Standby, precedence one hundred
Hellotime 3 sec, holdtime 10 sec
Up coming hello there sent in 0.776
Virtual IP deal with is 172.twelve.23.ten configured
Active router is 172.twelve.23.3, priority 100 expires in nine.568
Standby router is local
one condition variations, past condition transform 00:00:22
R3#exhibit standby
Regional condition is Lively, priority 100
Next howdy sent in 2.592
Lively router is local
Standby router is 172.twelve.23.2 expires in eight.020
Virtual mac handle is 0000.0c07.ac05
two condition improvements, last condition adjust 00:02:08
We can see that R3 continues to be selected as being the Lively router (“neighborhood condition is Active”), the Digital router’s IP is 172.twelve.23.ten, and R2 would be the standby router.
There are numerous HSRP values which you’ll want to change every so often. Imagine if we want R2 to be the Active router instead? Can we change the MAC address in the virtual router? I’ll reply All those concerns in the following aspect of the HSRP tutorial!