CCNP Certification / BCMSN Test Tutorial: Getting Started With HSRP
Defined in RFC 2281, HSRP is a Cisco-proprietary protocol in which routers are put into an HSRP router group. Coupled with dynamic routing protocols and STP, HSRP is considered a large-availability community assistance, considering that all a few have an Just about speedy cutover into a secondary path when the principal route is unavailable.
One of the routers might be picked as the primary (“Active”, in HSRP terminology), Which Most important will tackle the routing while the opposite routers are in standby, All set to deal with the load if the key router turns into unavailable. In this trend, HSRP ensures a substantial network uptime, because it routes IP traffic without the need of depending on only one router.
The hosts using HSRP like a gateway don’t know the actual IP or MAC addresses of your routers in the group. They’re communicating with a pseudorouter, a “Digital router” produced with the HSRP configuration. This virtual router can have a virtual MAC and IP adddress likewise.
The standby routers aren’t just likely to be sitting there, however! By configuring various HSRP teams on only one interface, HSRP load balancing can be achieved.
Before we reach the more Highly developed HSRP configuration, we improved get a essential one particular started! We’ll be using a two-router topology in this article, and keep in mind that just one or each of these routers may very well be multilayer switches in addition. For ease of reading through, I’m about to make reference to them only as routers.
R2 and R3 will both of those be configured to generally be in standby team five. The Digital router will likely have an IP address of 172.12.23.10 /24. All hosts in VLAN 100 should really 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 five ip 172.12.23.10
The clearly show command for HSRP is demonstrate standby, and it’s the 1st command you ought to run even though configuring and troubleshooting HSRP. Let’s operate it on both routers and Evaluate success.
R2#show standby
Ethernet0 – Team five
Neighborhood point out is Standby, priority a hundred
Hellotime 3 sec, holdtime 10 sec
Subsequent howdy despatched in 0.776
Virtual IP address is 172.12.23.ten configured
Active router is 172.12.23.three, precedence a hundred expires in nine.568
Standby router is community
1 state alterations, very last point out modify 00:00:22
R3#exhibit standby
Community point out is Lively, precedence a hundred
Up coming howdy despatched in two.592
Active router is nearby
Standby router is 172.twelve.23.2 expires in 8.020
Digital mac handle is 0000.0c07.ac05
two state changes, very last state adjust 00:02:08
We can see that R3 continues to be selected since the Lively router (“nearby state is Active”), the virtual router’s IP is 172.12.23.ten, and R2 will be the standby router.
There are several HSRP values you’ll will need to alter every so often. Let's say we would like R2 for being the Lively router alternatively? Can we alter the MAC address from the Digital router? 먹튀사이트 I’ll respond to These thoughts in the following portion of the HSRP tutorial!