For CCNA and CCNP candidates, it’s really hard not to chortle the first time you hear the phrase “router on the stick”. Enable’s facial area it, that’s a pretty foolish time period. But as anyone who has handed the CCNA and CCNP tests know, it is a critical Test topic you should learn how to configure and troubleshoot.
Primary Cisco theory states that for hosts in different VLANs to communicate, a Layer three machine need to be involved to deal with the routing among the VLANs. That device is actually a router, and you will discover Unique concerns that has to be taken into account for both of those the Bodily router alone and also the configuration you’ll be producing.
The router will be connected to a change through a FastEthernet port (or increased). The router port can't be a regular Ethernet port, For the reason that router port will require the ability to ship and acquire information simultaneously.
The configuration of the interface is where http://edition.cnn.com/search/?text=토토사이트 by items get exciting. Let’s say Now we have two VLANs that should be utilizing router-on-a-adhere to communicate.
Here's the VLAN data:
VLAN 20: 20.twenty.20.0 /24
VLAN 40: 40.forty.forty.0 /24
The port over the 안전공원 switch that can be connected to the router’s FastEthernet port has to be in trunking method, and you will need to know the trunking protocol in use. We’ll go Along with the Cisco-proprietary ISL listed here.
The physical FE port over the router will likely not have an IP handle. The usage of router-on-a-stick mandates the usage of rational subinterfaces. While we don’t should use the VLAN quantities with the subinterface figures, I’ve located this aids you retain the interfaces straight. One subinterface need to be given an IP tackle in VLAN twenty, and the other may have an IP deal with in VLAN forty.
After producing subinterfaces speedy 0.20 and rapid 0.40, the config looks like this:
interface fastethernet0
no ip handle
interface FastEthernet 0.twenty
ip address 20.twenty.twenty.1 255.255.255.0
interface FastEthernet 0.40
ip handle 40.forty.40.1 255.255.255.0
Truth be told, you’re Practically finished! Now we want the encapsulation statement below each subinterface. The subinterface assertion ought to reflect both equally the VLAN variety plus the encapsulation form being used. When we’re completed, the config would appear to be this:
no ip address
ip address twenty.20.twenty.1 255.255.255.0
encapsulation isl 20
ip deal with 40.forty.forty.one 255.255.255.0
encapsulation isl forty
And that’s it! Your hosts in VLAN twenty ought to now manage to communicate with hosts in VLAN forty, and vice versa.
A couple of closing troubleshooting factors – the most common mistake with router-on-a-adhere is To place the wrong vlan variety during the encapsulation statement. Also, make sure you have configured the router’s IP address in VLAN 20 because the default gateway for hosts in VLAN twenty, and do exactly the same for VLAN 40.
I hope you’ve savored this evaluate router-on-a-stick. Even though the name may get yourself a chuckle outside of you, it’s still Utilized in A number of networks to choose from, and realizing ways to configure and troubleshoot it can get you that Considerably closer to earning your CCNA and CCNP.