CCNP Certification / BCMSN Test Tutorial: Starting out With HSRP
Described in RFC 2281, HSRP is usually a Cisco-proprietary protocol where routers are put into an HSRP router group. Along with dynamic routing protocols and STP, HSRP is taken into account a significant-availability community company, considering that all 3 have an Pretty much quick cutover into a secondary route when the first route is unavailable.
One of many routers is going to be picked as the first (“Active”, in HSRP terminology), Which Most important will deal with the routing when the opposite routers are in standby, All set to take care of the load if the key router gets unavailable. Within this manner, HSRP makes certain a higher network uptime, because it routes IP visitors with out depending on an individual router.
The hosts applying HSRP being a gateway don’t know the particular IP or MAC addresses in the routers in the team. They’re speaking that has a pseudorouter, a “Digital router” designed from the HSRP configuration. This virtual router could have a Digital MAC and IP adddress at the same time.
The standby routers aren’t just gonna be sitting there, although! By configuring several HSRP groups on just one interface, HSRP load balancing is usually attained.
Right before we get to the more State-of-the-art HSRP 먹튀검증 configuration, we better obtain a simple one particular started! We’ll be employing a two-router topology listed here, and keep in mind that one particular or each of those routers could be multilayer switches as well. For relieve of looking at, I’m going to check with them only as routers.
R2 and R3 will the two be configured to become in standby group five. The Digital router can have an IP deal with of 172.12.23.ten /24. All hosts in VLAN one hundred should use this handle as their default gateway.
R2(config)#interface ethernet0
R2(config-if)#standby 5 ip 172.twelve.23.10
R3(config)#interface ethernet0
R3(config-if)#standby 5 ip 172.twelve.23.ten
The display command for HSRP is demonstrate standby, and it’s the first command you should run whilst configuring and troubleshooting HSRP. Enable’s operate it on the two routers and Assess results.
R2#display standby
Ethernet0 – Group 5
Area condition is Standby, precedence 100
Hellotime three sec, holdtime ten sec
Up coming good day sent in 0.776
Digital IP address is 172.12.23.10 configured
Active router is 172.12.23.three, precedence a hundred expires in 9.568
Standby router is local
one condition variations, previous point out change 00:00:22
R3#show standby
Community point out is Lively, precedence a hundred
Subsequent hello there despatched in two.592
Active router is area
Standby router is 172.12.23.2 expires in 8.020
Virtual mac tackle is 0000.0c07.ac05
2 point out changes, past point out adjust 00:02:08
We could see that R3 has been selected given that the Active router (“area condition is Energetic”), the virtual router’s IP is 172.12.23.ten, and R2 could be the standby router.
There are numerous HSRP values that you’ll want to vary every now and then. What if we would like R2 to be the Energetic router alternatively? Can we alter the MAC tackle from the Digital router? I’ll solution All those inquiries in the subsequent aspect of this HSRP tutorial!