CCNP Certification / BCMSN Exam Tutorial: Starting out With HSRP
Outlined in RFC 2281, HSRP is often a Cisco-proprietary protocol in which routers are set into an HSRP router group. Together with dynamic routing protocols and STP, HSRP is considered a superior-availability community assistance, given that all 3 have an Nearly fast cutover to some secondary route when the main route is unavailable.
Among the routers will be selected as the primary (“Active”, in HSRP terminology), Which Major will take care of the routing even though the opposite routers are in standby, ready to manage the load if the key router turns into unavailable. During this manner, HSRP makes sure a significant community uptime, because it routes IP targeted visitors with out relying on just one router.
The hosts working with HSRP being a gateway don’t know the particular IP or MAC 먹튀사이트 addresses of the routers inside the team. They’re communicating by using a pseudorouter, a “virtual router” established through the HSRP configuration. This Digital router can have a virtual MAC and IP adddress at the same time.
The standby routers aren’t just destined to be sitting there, nevertheless! By configuring a number of HSRP teams on only one interface, HSRP load balancing is usually accomplished.
Right before we reach the more Innovative HSRP configuration, we greater get a primary a person started! We’ll be using a two-router topology in this article, and Remember that one particular or equally of these routers could be multilayer switches in addition. For ease of looking through, I’m gonna seek advice from them only as routers.
R2 and R3 will both be configured to generally be in standby team five. The virtual router will have an IP address of 172.12.23.ten /24. All hosts in VLAN one hundred must 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 172.12.23.ten
The present command for HSRP is present standby, and it’s the main command you need to operate even though configuring and troubleshooting HSRP. Let’s operate it on both of those routers and Evaluate effects.
R2#exhibit standby
Ethernet0 – Group 5
Neighborhood condition is Standby, precedence a hundred
Hellotime three sec, holdtime 10 sec
Up coming hello despatched in 0.776
Digital IP deal with is 172.twelve.23.10 configured
Energetic router is 172.12.23.three, precedence 100 expires in nine.568
Standby router is neighborhood
1 state improvements, very last state improve 00:00:22
R3#present standby
Nearby state is Lively, priority a hundred
Next hi there sent in 2.592
Active router is regional
Standby router is 172.12.23.2 expires in 8.020
Virtual mac tackle is 0000.0c07.ac05
2 point out modifications, last condition transform 00:02:08
We will see that R3 continues to be picked as the Active router (“area state is Energetic”), the virtual router’s IP is 172.twelve.23.ten, and R2 could be the standby router.
There are a few HSRP values that you choose to’ll will need to alter every now and then. Let's say we want R2 to become the Active router rather? Can we change the MAC tackle on the Digital router? I’ll respond to Individuals inquiries in another aspect of the HSRP tutorial!