For CCNA as well as CCNP candidates, it truly is difficult never to laugh once an individual pick up the actual key phrase "router on the stick". Let's face it, of your fairly silly term. But seeing that anyone who has passed the particular CCNA and CCNP tests know, that is the important exam issue that you need to discover how to configure and also troubleshoot.
Basic Cisco idea says that to get hosts within numerous VLANs to communicate, a new Layer a few device has to be included to help handle your routing somewhere between your VLANs. That unit is really a router, and also you will discover special considerations that has to be considered in to are the reason for both equally the particular physical router itself as well as the particular configuration you will be writing.
The router is going to be linked to a switch via your FastEthernet opening (or higher). The router port is not a typical Ethernet port, since router port need your ability to help mail plus receive records with the same time. The configuration associated with this interface is wherever issues receive interesting. Let's declare we have a couple VLANs that could workout on router-on-a-stick to be able to communicate. Here is a VLAN information:
VLAN 20: 20.20.20.0 /24
VLAN 40: 40.40.40.0 /24
The opening around the switch that can become associated with the router's FastEthernet dock needs to be around trunking mode, also , you has to know the particular trunking protocol around use. We'll visit by using the particular Cisco-proprietary ISL here.
The real FE interface around the router won't have an IP address. The utilization of router-on-a-stick requires the employment of logical subinterfaces. While most people don't have to utilize the VLAN volumes with the subinterface numbers, I've discovered this assists you to keep your interfaces straight. One subinterface must be provided an IP address around VLAN 20, and also the some other will have a great IP address in VLAN 40.
After generating subinterfaces quickly 0.20 plus fast 0.40, that config seems as if this:
interface fastethernet0
absolutely no ip address
interface FastEthernet 0.20
ip correct 20.20.20.1 255.255.255.0
interface FastEthernet 0.40
ip tackle 40.40.40.1 255.255.255.0
Believe the item or even not, you happen to be just about done! Now we all require your encapsulation report beneath each subinterface. The subinterface assertion have got to reveal each the actual VLAN range as well as the encapsulation sort becoming used. When we're finished, the particular config will mimic this:
interface fastethernet0
no ip address
interface FastEthernet 0.20
ip address 20.20.20.1 255.255.255.0
encapsulation isl 20
interface FastEthernet 0.40
ip target 40.40.40.1 255.255.255.0
encapsulation isl 40
And that's it! Your owners in VLAN 20 will need to at this point be capable to direct serves in VLAN 40, plus vice versa.
A couple of ultimate troubleshooting points - the most common miscalculation using router-on-a-stick could be to placed the wrong vlan range inside encapsulation statement. Also, make sure you might have set up that router's IP correct throughout VLAN twenty for the reason that default trip pertaining to serves in VLAN 20, and also do the same regarding VLAN 40.
I wish you might have loved this specific look at router-on-a-stick. While your identify may get some sort of chuckle outside you, it really is nonetheless utilized in quite a few systems out there there, in addition to knowing how you can configure and troubleshoot this will probably enable you to get much closer to help gaining your own CCNA plus CCNP.
access point vs router
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