CCNP Certification / BCMSN Exam Tutorial: Starting out With HSRP
Outlined in RFC 2281, HSRP is usually a Cisco-proprietary protocol wherein routers are put into an HSRP router group. In addition to dynamic routing protocols and STP, HSRP is considered a higher-availability network provider, considering the fact that all three have an Nearly rapid cutover into a secondary route when the primary route is unavailable.
On the list of routers are going to be selected as the first (“Active”, in HSRP terminology), and that Most important will handle the routing while the other routers are in standby, All set to deal with the load if the key router becomes unavailable. With this vogue, HSRP makes certain a high community uptime, since it routes IP website traffic without the need of counting on an individual router.
The hosts using HSRP being a gateway don’t know the particular IP or MAC addresses of your routers inside the team. They’re speaking which has a pseudorouter, a “Digital router” developed through the HSRP configuration. This virtual router may have a Digital MAC and IP adddress at the same time.
The standby routers aren’t just destined to be sitting there, though! By configuring numerous HSRP groups on an individual interface, HSRP load balancing is often obtained.
In advance of we get to the greater Highly developed HSRP configuration, we far better obtain a basic 1 begun! We’ll be utilizing a two-router topology below, and Remember the fact that just one or each of such routers may very well be multilayer switches too. For ease of looking at, I’m about to refer to them only as routers.
R2 and R3 will both equally be configured to get in standby group 5. The virtual router should have an IP handle of 172.twelve.23.ten /24. All hosts in VLAN 100 should really use this deal with 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 five ip 172.twelve.23.10
The exhibit command for HSRP is present standby, and it’s the very first command you ought to operate even though configuring and troubleshooting HSRP. Permit’s operate it on the two routers and Evaluate outcomes.
R2#clearly show standby
Ethernet0 – Team five
Area point out is Standby, priority a hundred
Hellotime 3 sec, holdtime ten sec
Future 안전놀이터 hi there sent in 0.776
Digital IP deal with is 172.12.23.ten configured
Energetic router is 172.12.23.3, priority a hundred expires in nine.568
Standby router is community
1 state variations, final point out improve 00:00:22
R3#present standby
Regional condition is Energetic, priority a hundred
Up coming hi there sent in two.592
Active router is community
Standby router is 172.twelve.23.two expires in 8.020
Virtual mac address is 0000.0c07.ac05
two state alterations, past state transform 00:02:08
We will see that R3 has long been selected because the Active router (“community point out is Lively”), the Digital router’s IP is 172.12.23.10, and R2 may be the standby router.
There are several HSRP values you’ll will need to change on occasion. Imagine if we would like R2 to become the Active router in its place? Can we alter the MAC address with the virtual router? I’ll response those concerns in the next part of this HSRP tutorial!