CCNP Certification / BCMSN Exam Tutorial: Starting out With HSRP
Described in RFC 2281, HSRP is usually a Cisco-proprietary protocol where routers are put into an HSRP router team. Along with dynamic routing protocols and STP, HSRP is considered a significant-availability network provider, considering that all three have an almost quick cutover to some secondary path when the principal path is unavailable.
On 안전놀이터 the list of routers are going to be picked as the first (“Energetic”, in HSRP terminology), and that Principal will cope with the routing while another routers are in standby, All set to deal with the load if the key router gets unavailable. In this fashion, HSRP assures a higher community uptime, as it routes IP targeted traffic without the need of depending on a single router.
The hosts applying HSRP for a gateway don’t know the particular IP or MAC addresses of your routers inside the group. They’re speaking using a pseudorouter, a “Digital router” produced from the HSRP configuration. This virtual router will likely have a virtual MAC and IP adddress also.
The standby routers aren’t just likely to be sitting down there, although! By configuring multiple HSRP teams on a single interface, HSRP load balancing is often obtained.
Before we get to the greater Highly developed HSRP configuration, we much better receive a primary just one started! We’ll be using a two-router topology in this article, and Remember the fact that a person or equally of those routers might be multilayer switches in addition. For relieve of studying, I’m about to consult with them only as routers.
R2 and R3 will each be configured to generally be in standby group five. The virtual router may have an IP deal with of 172.12.23.ten /24. All hosts in VLAN a hundred should really 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 172.12.23.10
The demonstrate command for HSRP is clearly show standby, and it’s the primary command you should run though configuring and troubleshooting HSRP. Let’s run it on both of those routers and compare success.
R2#display standby
Ethernet0 – Group five
Local condition is Standby, precedence 100
Hellotime 3 sec, holdtime 10 sec
Next hi sent in 0.776
Virtual IP deal with is 172.12.23.ten configured
Lively router is 172.12.23.three, precedence a hundred expires in 9.568
Standby router is nearby
one point out improvements, last point out adjust 00:00:22
R3#present standby
Community state is Active, priority one hundred
Upcoming hello sent in 2.592
Lively router is community
Standby router is 172.12.23.2 expires in 8.020
Digital mac tackle is 0000.0c07.ac05
2 point out improvements, last condition alter 00:02:08
We can see that R3 is selected as being the Lively router (“local state is Lively”), the Digital router’s IP is 172.12.23.ten, and R2 is definitely the standby router.
There are several HSRP values which you’ll need to vary on occasion. Let's say we wish R2 to get the Lively router in its place? Can we alter the MAC tackle from the Digital router? I’ll remedy those inquiries in the following component of the HSRP tutorial!