CCNP Certification / BCMSN Exam Tutorial: Getting going With HSRP
Outlined in RFC 2281, HSRP is usually a Cisco-proprietary 토토먹튀 protocol by which routers are set into an HSRP router group. Together with dynamic routing protocols and STP, HSRP is taken into account a higher-availability network company, considering the fact that all a few have an Nearly fast cutover to your secondary path when the main path is unavailable.
On the list of routers are going to be chosen as the main (“Lively”, in HSRP terminology), and that Main will cope with the routing although the other routers are in standby, Prepared to take care of the load if the first router will become unavailable. On this manner, HSRP makes sure a significant network uptime, as it routes IP website traffic without having relying on just one router.
The hosts employing HSRP as a gateway don’t know the particular IP or MAC addresses of your routers inside the group. They’re communicating with a pseudorouter, a “virtual router” created through the HSRP configuration. This virtual router may have a virtual MAC and IP adddress also.
The standby routers aren’t just going to be sitting down there, however! By configuring many HSRP teams on only one interface, HSRP load balancing might be accomplished.
Before we get to the greater Innovative HSRP configuration, we better have a standard 1 commenced! We’ll be employing a two-router topology right here, and Understand that one particular or equally of these routers could possibly be multilayer switches also. For relieve of reading, I’m gonna seek advice from them only as routers.
R2 and R3 will the two 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 one hundred must use this address 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 five ip 172.twelve.23.10
The present command for HSRP is demonstrate standby, and it’s the 1st command it is best to run while configuring and troubleshooting HSRP. Permit’s operate it on the two routers and Assess outcomes.
R2#demonstrate standby
Ethernet0 – Team five
Area condition is Standby, precedence 100
Hellotime three sec, holdtime ten sec
Up coming hi there despatched in 0.776
Virtual IP handle is 172.12.23.ten configured
Energetic router is 172.twelve.23.3, precedence one hundred expires in nine.568
Standby router is neighborhood
one point out variations, very last point out adjust 00:00:22
R3#display standby
Area state is Active, precedence 100
Following hi sent in two.592
Lively router is nearby
Standby router is 172.twelve.23.two expires in eight.020
Virtual mac handle is 0000.0c07.ac05
two point out modifications, last state change 00:02:08
We are able to see that R3 has long been picked as being the Energetic router (“local state is Energetic”), the virtual router’s IP is 172.twelve.23.10, and R2 would be the standby router.
There are many HSRP values that you simply’ll want to change occasionally. Let's say we want R2 to become the Active router rather? Can we alter the MAC deal with of the virtual router? I’ll response those queries in another element of this HSRP tutorial!