CCNP Certification / 안전놀이터 BCMSN Test Tutorial: Getting Started With HSRP
Defined in RFC 2281, HSRP can be a Cisco-proprietary protocol by which routers are place into an HSRP router group. As well as dynamic routing protocols and STP, HSRP is considered a higher-availability network support, because all a few have an Nearly immediate cutover to some secondary path when the main route is unavailable.
One of several routers are going to be chosen as the main (“Active”, in HSRP terminology), and that Main will handle the routing when another routers are in standby, ready to take care of the load if the first router results in being unavailable. During this manner, HSRP makes certain a large community uptime, as it routes IP visitors without depending on one router.
The hosts employing HSRP like a gateway don’t know the particular IP or MAC addresses with the routers during the team. They’re speaking by using a pseudorouter, a “Digital router” created through the HSRP configuration. This Digital router could have a Digital MAC and IP adddress too.
The standby routers aren’t just gonna be sitting there, although! By configuring various HSRP teams on just one interface, HSRP load balancing might be reached.
Prior to we reach the more Superior HSRP configuration, we improved obtain a simple a single started out! We’ll be using a two-router topology in this article, and Take into account that just one or both equally of those routers could be multilayer switches as well. For simplicity of reading through, I’m likely to seek advice from them only as routers.
R2 and R3 will the two be configured to be in standby group five. The Digital router should have an IP deal with of 172.twelve.23.10 /24. All hosts in VLAN 100 need to use this address as their default gateway.
R2(config)#interface ethernet0
R2(config-if)#standby five ip 172.12.23.ten
R3(config)#interface ethernet0
R3(config-if)#standby five ip 172.12.23.ten
The present command for HSRP is show standby, and it’s http://www.bbc.co.uk/search?q=먹튀검증 the 1st command you should operate when configuring and troubleshooting HSRP. Let’s operate it on each routers and Look at outcomes.
R2#exhibit standby
Ethernet0 – Group five
Neighborhood point out is Standby, precedence one hundred
Hellotime three sec, holdtime ten sec
Future howdy sent in 0.776
Virtual IP address is 172.12.23.10 configured
Energetic router is 172.twelve.23.3, precedence one hundred expires in 9.568
Standby router is regional
1 state changes, previous condition transform 00:00:22
R3#demonstrate standby
Neighborhood point out is Energetic, precedence one hundred
Future hello there despatched in 2.592
Energetic router is nearby
Standby router is 172.twelve.23.2 expires in eight.020
Digital mac address is 0000.0c07.ac05
2 point out adjustments, final condition transform 00:02:08
We can easily see that R3 continues to be picked as being the Energetic router (“community state is Lively”), the virtual router’s IP is 172.12.23.10, and R2 is the standby router.
There are many HSRP values you’ll want to vary once in a while. What if we would like R2 to generally be the Lively router as a substitute? Can we change the MAC tackle with the Digital router? I’ll answer those issues in the subsequent part of this HSRP tutorial!