CCNP Certification / BCMSN Examination Tutorial: Getting Started With HSRP
Described in RFC 2281, HSRP can be a Cisco-proprietary protocol during which routers are set into an HSRP router team. Along with dynamic routing protocols and STP, HSRP is considered a significant-availability network service, due to the fact all three have an Pretty much immediate cutover into a secondary path when the principal route is unavailable.
One of the routers might be chosen as the key (“Energetic”, in HSRP terminology), Which Main will manage the routing while another routers are in standby, Completely ready to deal with the load if the principal router results in being unavailable. With this style, HSRP makes sure a higher network uptime, since it routes IP targeted traffic with out counting on only one router.
The hosts applying HSRP like a gateway don’t know the actual IP or MAC addresses of the routers from the group. They’re speaking by using a pseudorouter, a “virtual router” created with the HSRP configuration. This Digital router will likely have a virtual MAC and IP adddress as well.
The standby routers aren’t just gonna be sitting there, even though! By configuring multiple HSRP groups on only one interface, HSRP load balancing is usually reached.
In advance of we get to the greater advanced HSRP configuration, we much better have a simple 먹튀검증 one started off! We’ll be utilizing a two-router topology below, and Take into account that a person or the two of these routers may very well be multilayer switches at the same time. For simplicity of reading, I’m likely to consult with them only as routers.
R2 and R3 will the two be configured to be in standby team five. The virtual router could have an IP tackle of 172.12.23.10 /24. All hosts in VLAN 100 should really use this address as their default gateway.
R2(config)#interface ethernet0
R2(config-if)#standby five ip 172.12.23.ten
R3(config)#interface ethernet0
R3(config-if)#standby 5 ip 172.12.23.10
The clearly show command for HSRP is exhibit standby, and it’s the first command you'll want to run whilst configuring and troubleshooting HSRP. Permit’s run it on equally routers and Evaluate benefits.
R2#present standby
Ethernet0 – Team five
Community state is Standby, priority one hundred
Hellotime three sec, holdtime 10 sec
Subsequent hi there despatched in 0.776
Digital IP deal with is 172.12.23.ten configured
Lively router is 172.12.23.three, precedence one hundred expires in 9.568
Standby router is local
1 condition modifications, previous point out modify 00:00:22
R3#show standby
Community state is Energetic, precedence a hundred
Following hello sent in two.592
Lively router is nearby
Standby router is 172.12.23.two expires in 8.020
Digital mac handle is 0000.0c07.ac05
2 condition changes, previous point out alter 00:02:08
We will see that R3 is selected as the Energetic router (“regional state is Lively”), the Digital router’s IP is 172.twelve.23.ten, and R2 may be the standby router.
There are several HSRP values that you simply’ll want to change on occasion. Let's say we wish R2 for being the Active router instead? Can we change the MAC deal with on the Digital router? I’ll response People thoughts in another aspect of the HSRP tutorial!