For CCNA and CCNP candidates, it’s hard to not chortle The 1st time you hear the phrase “router on 먹튀검증 a stick”. Permit’s deal with it, that’s a pretty silly time period. But as anyone who has handed the CCNA and CCNP tests know, this can be a crucial exam subject that you just will have to know how to configure and troubleshoot.
Basic Cisco theory states that for hosts in various VLANs to speak, a Layer three gadget needs to be associated to take care of the routing in between the VLANs. That device is actually a router, and you can find Distinctive criteria that need to be taken into consideration for the two the Actual physical router itself as well as configuration you’ll be writing.
The router is going to be connected to a switch by way of a FastEthernet port (or increased). The router port can not be an everyday Ethernet port, since the router port will need the ability to mail and receive info simultaneously.
The configuration with the interface is in which issues get appealing. Permit’s say we have two VLANs which will be applying router-on-a-adhere to speak.
Here is the VLAN information:
VLAN 20: twenty.twenty.twenty.0 /24
VLAN forty: forty.40.forty.0 /24
The port about the swap that can be connected to the router’s FastEthernet port need to be in trunking mode, and you must know the trunking protocol in use. We’ll go Along with the Cisco-proprietary ISL here.
The Actual physical FE port within the router will never have an IP tackle. The usage of router-on-a-adhere mandates the use of logical subinterfaces. While we don’t should utilize the VLAN quantities to the subinterface figures, I’ve identified this assists you keep the interfaces straight. A single subinterface needs to be provided an IP deal with in VLAN 20, and another should have an IP deal with in VLAN 40.
After creating subinterfaces rapid 0.twenty and quickly 0.forty, the config appears like this:
interface fastethernet0
no ip tackle
interface FastEthernet 0.twenty
ip deal with 20.twenty.20.one 255.255.255.0
interface FastEthernet 0.forty
ip tackle forty.forty.40.1 255.255.255.0
Truth be told, you’re Nearly finished! Now we need the encapsulation statement underneath Every subinterface. The subinterface http://www.bbc.co.uk/search?q=먹튀검증 statement will have to mirror each the VLAN variety and the encapsulation kind getting used. After we’re completed, the config would look like this:
no ip deal with
ip address 20.twenty.20.1 255.255.255.0
encapsulation isl twenty
ip handle 40.forty.forty.one 255.255.255.0
encapsulation isl forty
And that’s it! Your hosts in VLAN twenty must now be able to talk to hosts in VLAN 40, and vice versa.
Several closing troubleshooting factors – the most typical error with router-on-a-adhere is To place the wrong vlan selection inside the encapsulation assertion. Also, make sure you have configured the router’s IP tackle in VLAN 20 since the default gateway for hosts in VLAN twenty, and do a similar for VLAN forty.
I hope you’ve enjoyed this check out router-on-a-adhere. Although the title could obtain a chuckle away from you, it’s nevertheless Utilized in Numerous networks to choose from, and being aware of how you can configure and troubleshoot it can get you that A great deal nearer to earning your CCNA and CCNP.