CCNP Certification / BCMSN Test Tutorial: Getting going With HSRP
Described in RFC 2281, HSRP can be a Cisco-proprietary protocol 먹튀사이트 wherein routers are put into an HSRP router group. Along with dynamic routing protocols and STP, HSRP is taken into account a superior-availability network provider, given that all a few have an Just about instant cutover to your secondary path when the main path is unavailable.
On the list of routers might be selected as the main (“Lively”, in HSRP terminology), and that primary will tackle the routing when the other routers are in standby, Prepared to take care of the load if the first router results in being unavailable. With this manner, HSRP makes certain a substantial community uptime, because it routes IP website traffic with no relying on an individual router.
The hosts utilizing HSRP as a gateway don’t know the particular IP or MAC addresses of your routers during the team. They’re communicating having a pseudorouter, a “Digital router” designed through the HSRP configuration. This virtual router could have a Digital MAC and IP adddress in addition.
The standby routers aren’t just gonna be sitting there, although! By configuring several HSRP teams on an individual interface, HSRP load balancing may be realized.
Just before we reach the greater Innovative HSRP configuration, we better have a essential just one started out! We’ll be utilizing a two-router topology in this article, and keep in mind that one particular or equally of these routers can be multilayer switches also. For relieve of studying, I’m going to make reference to them only as routers.
R2 and R3 will the two be configured to get in standby group 5. The Digital router will likely have an IP deal with of 172.twelve.23.10 /24. All hosts in VLAN 100 should use this handle as their default gateway.
R2(config)#interface ethernet0
R2(config-if)#standby 5 ip 172.12.23.10
R3(config)#interface ethernet0
R3(config-if)#standby 5 ip 172.twelve.23.10
The demonstrate command for HSRP is clearly show standby, and it’s the 1st command you should operate when configuring and troubleshooting HSRP. Permit’s run it on both routers and compare outcomes.
R2#display standby
Ethernet0 – Group 5
Nearby condition is Standby, priority 100
Hellotime three sec, holdtime ten sec
Up coming good day sent in 0.776
Virtual IP deal with is 172.12.23.ten configured
Active router is 172.12.23.three, precedence a hundred expires in 9.568
Standby router is neighborhood
one state adjustments, previous state adjust 00:00:22
R3#present standby
Nearby point out is Energetic, priority a hundred
Subsequent hello there despatched in two.592
Active router is area
Standby router is 172.twelve.23.2 expires in eight.020
Digital mac tackle is 0000.0c07.ac05
two point out modifications, past condition improve 00:02:08
We will see that R3 has been chosen given that the Energetic router (“community state is Lively”), the Digital router’s IP is 172.12.23.10, and R2 is the standby router.
There are some HSRP values that you simply’ll need to vary every so often. What if we want R2 to get the Energetic router alternatively? Can we change the MAC deal with of your Digital router? I’ll respond to People issues in the subsequent aspect of the HSRP tutorial!