For CCNA and CCNP candidates, it’s tricky to not chuckle The 1st time you hear the phrase “router on the adhere”. Permit’s facial area it, that’s a fairly silly term. But as those who have handed the CCNA and CCNP exams know, this is the critical Examination topic that you must know how to configure and troubleshoot.
Primary Cisco theory states that 먹튀검증 for hosts in different VLANs to communicate, a Layer 3 gadget have to be included to manage the routing among the VLANs. That machine is usually a router, and you'll find Specific things to consider that should be taken into account for each the Actual physical router itself along with the configuration you’ll be crafting.
The router will likely be linked to a swap via a FastEthernet port (or bigger). The router port can't be an everyday Ethernet port, since the router port will need the chance to deliver and acquire details at the same time.
The configuration on the interface is where by things get appealing. Enable’s say We've two VLANs that may be working with router-on-a-stick to communicate.
Here is the VLAN data:
VLAN 20: twenty.twenty.twenty.0 /24
VLAN 40: 40.40.forty.0 /24
The port about the switch which will be connected to the router’s FastEthernet port should be in trunking mode, and you must know the trunking protocol in use. We’ll go Along with the Cisco-proprietary ISL here.
The Bodily FE port about the router will never have an IP handle. The usage of router-on-a-adhere mandates the use of logical subinterfaces. Whilst we don’t need to make use of the VLAN numbers to the subinterface figures, I’ve located this allows you keep the interfaces straight. http://query.nytimes.com/search/sitesearch/?action=click&contentCollection®ion=TopBar&WT.nav=searchWidget&module=SearchSubmit&pgtype=Homepage#/토토사이트 1 subinterface need to be provided an IP deal with in VLAN 20, and another can have an IP address in VLAN forty.
Right after developing subinterfaces rapidly 0.20 and rapid 0.40, the config seems like this:
interface fastethernet0
no ip tackle
interface FastEthernet 0.twenty
ip tackle twenty.twenty.twenty.1 255.255.255.0
interface FastEthernet 0.40
ip handle forty.forty.40.one 255.255.255.0
Believe it or not, you’re Virtually accomplished! Now we'd like the encapsulation assertion less than Each and every subinterface. The subinterface statement ought to reflect the two the VLAN number plus the encapsulation form being used. Whenever we’re completed, the config would appear to be this:
no ip deal with
ip address 20.twenty.twenty.1 255.255.255.0
encapsulation isl 20
ip tackle 40.40.40.one 255.255.255.0
encapsulation isl 40
And that’s it! Your hosts in VLAN 20 must now be capable to communicate with hosts in VLAN 40, and vice versa.
A couple of ultimate troubleshooting details – the commonest mistake with router-on-a-adhere is To place the wrong vlan variety in the encapsulation assertion. Also, make sure you have configured the router’s IP handle in VLAN 20 as the default gateway for hosts in VLAN 20, and do a similar for VLAN 40.
I hope you’ve loved this have a look at router-on-a-adhere. Although the name could receive a chuckle out of you, it’s nonetheless Employed in Numerous networks to choose from, and realizing how you can configure and troubleshoot it will get you that Significantly closer to earning your CCNA and CCNP.