CCNP Certification / BCMSN Examination Tutorial: Getting going With HSRP
Described in RFC 2281, HSRP is usually a Cisco-proprietary protocol where routers are set 토토검증 into an HSRP router group. In addition to dynamic routing protocols and STP, HSRP is taken into account a significant-availability network support, considering the fact that all three have an almost immediate cutover to some secondary route when the first path is unavailable.
Among the list of routers are going to be chosen as the first (“Active”, in HSRP terminology), Which Major will manage the routing while the opposite routers are in standby, All set to handle the load if the principal router turns into unavailable. In this particular manner, HSRP makes sure a substantial community uptime, because it routes IP traffic with out depending on one router.
The hosts applying HSRP being a gateway don’t know the actual IP or MAC addresses on the routers inside the team. They’re speaking with a pseudorouter, a “virtual router” created from the HSRP configuration. This Digital router may have a Digital MAC and IP adddress in addition.
The standby routers aren’t just going to be sitting there, while! By configuring several HSRP groups on a single interface, HSRP load balancing may be achieved.
Ahead of we get to the more Sophisticated HSRP configuration, we superior get yourself a simple 1 commenced! We’ll be using a two-router topology in this article, and Remember the fact that a single or equally of such routers could be multilayer switches also. For simplicity of reading through, I’m going to consult with them only as routers.
R2 and R3 will each be configured to be in standby team five. The Digital router can have an IP handle of 172.12.23.ten /24. All hosts in VLAN a hundred need to use this tackle 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.twelve.23.10
The exhibit command for HSRP is demonstrate standby, and it’s the 1st command it is best to operate although configuring and troubleshooting HSRP. Enable’s run it on equally routers and Assess effects.
R2#show standby
Ethernet0 – Group five
Nearby condition is Standby, priority one hundred
Hellotime three sec, holdtime 10 sec
Next good day sent in 0.776
Digital IP tackle is 172.12.23.10 configured
Energetic router is 172.twelve.23.three, precedence a hundred expires in nine.568
Standby router is nearby
one condition alterations, previous condition alter 00:00:22
R3#show standby
Nearby point out is Energetic, precedence a hundred
Up coming good day sent in two.592
Energetic router is community
Standby router is 172.twelve.23.2 expires in 8.020
Digital mac address is 0000.0c07.ac05
two state adjustments, last condition transform 00:02:08
We could see that R3 has been picked since the Active router (“area point out is Active”), the Digital router’s IP is 172.12.23.10, and R2 is the standby router.
Usually there are some HSRP values that you’ll need to change occasionally. Imagine if we want R2 to be the Lively router alternatively? Can we alter the MAC address in the virtual router? I’ll respond to Individuals issues in the following part of this HSRP tutorial!