CCNP Certification / BCMSN Exam Tutorial: Getting Started With HSRP
Described in RFC 2281, HSRP is really a Cisco-proprietary protocol wherein routers are set into an HSRP router team. In addition to dynamic routing protocols and STP, HSRP is taken into account a substantial-availability network assistance, considering the fact that all a few have an Practically immediate cutover to some secondary path when the principal path is unavailable.
One of many routers might be picked as the primary (“Energetic”, in HSRP terminology), Which Most important will take care of the routing when the opposite routers are in standby, All set to take care of the load if the primary router gets unavailable. With this vogue, HSRP makes sure a large community uptime, because it routes IP visitors devoid of counting on an individual router.
The hosts employing HSRP being a gateway don’t know the 먹튀검증업체 particular IP or MAC addresses on the routers within the group. They’re communicating that has a pseudorouter, a “virtual router” designed through the HSRP configuration. This Digital router could have a Digital MAC and IP adddress at the same time.
The standby routers aren’t just going to be sitting down there, although! By configuring many HSRP groups on a single interface, HSRP load balancing may be reached.
Just before we get to the more Sophisticated HSRP configuration, we superior get yourself a basic 1 commenced! We’ll be using a two-router topology here, and Understand that one or both equally of these routers might be multilayer switches at the same time. For ease of examining, I’m about to confer with them only as routers.
R2 and R3 will both be configured to become in standby group 5. The Digital router could have an IP tackle of 172.twelve.23.10 /24. All hosts in VLAN 100 must use this deal with as their default gateway.
R2(config)#interface ethernet0
R2(config-if)#standby five ip 172.twelve.23.10
R3(config)#interface ethernet0
R3(config-if)#standby 5 ip 172.12.23.ten
The display command for HSRP is show standby, and it’s the initial command it is best to operate although configuring and troubleshooting HSRP. Let’s operate it on each routers and Assess results.
R2#display standby
Ethernet0 – Group 5
Neighborhood state is Standby, priority a hundred
Hellotime three sec, holdtime ten sec
Future good day despatched in 0.776
Virtual IP tackle is 172.twelve.23.ten configured
Active router is 172.12.23.3, precedence a hundred expires in 9.568
Standby router is nearby
one point out modifications, previous point out transform 00:00:22
R3#show standby
Neighborhood state is Active, precedence a hundred
Future hi there despatched in two.592
Energetic router is neighborhood
Standby router is 172.12.23.2 expires in eight.020
Virtual mac tackle is 0000.0c07.ac05
2 state improvements, very last point out modify 00:02:08
We can see that R3 has become selected as being the Active router (“regional point out is Lively”), the Digital router’s IP is 172.12.23.10, and R2 is definitely the standby router.
There are many HSRP values that you just’ll need to have to alter once in a while. Imagine if we would like R2 for being the Active router as a substitute? Can we change the MAC deal with in the Digital router? I’ll solution These questions in the next section of this HSRP tutorial!