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Home > Archive > CCNA > May 2001 > v-lans
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| Silkysmoothe1 2001-05-21, 3:37 pm |
| question I read,,,,
"what is v-lans benefits?"
answere: they increase the broadcast domain
I thought that the v-lans decreased the domain by adding smaller domains for each v-lan????
can anyone elaborate?????
,,,silky,,, | |
| dinoamaral 2001-05-21, 3:44 pm |
| The main benefit of v-lan is to decrease the size of the broadcast domain, increase the number of broadcast domain, and reduce the colision. Thatīs it !!!! | |
| strikeattack 2001-05-21, 4:43 pm |
| Dino...
I fail to see how VLANS affect collision domains... Because only switches support VLANs, every port is its own collision domain anyway.
The benefits of VLANS include:
· Security
· Segmentation
· Flexibility
· Simplify moves, adds, changes.
· Reduces administrative costs.
· Unnecessary LAN bandwidth is reduced compared to a single broadcast domain.
· Reducing broadcasts reduces unnecessary CPU usage. | |
| Silkysmoothe1 2001-05-21, 4:47 pm |
| quote:
Originally posted by strikeattack
Dino...
I fail to see how VLANS affect collision domains... Because only switches support VLANs, every port is its own collision domain anyway.
Yeah! what he said,,,,,,
no seriously,,,
a because they keep the collisions in their own segment maybe???????making for less collisions over the entire network???????????????? | |
| strikeattack 2001-05-21, 4:55 pm |
| A collision is not going to occur through a switch. Collisions on a switch are contained to a single switch port. Even if the port is configured for half duplex, collisions are contained to that port.
Hubs seperate neither collision domains or broadcast domains.
Switches seperate collision domains but not broadcast domains.
Routers seperate collision domains and broadcast domains.
Hope this helps alleviate any confusion. | |
| dmaftei 2001-05-21, 5:08 pm |
| quote:
Originally posted by strikeattack
Switches seperate collision domains but not broadcast domains.
If there is only one VLAN on the switch. Normally a VLAN is a broadcast domain, so a switch with many VLANs is part of many broadcast domains.
Cheers! | |
| strikeattack 2001-05-21, 5:11 pm |
| Yep. If you have more than one switch participating in VLANS, don't forget to set up ISL by SWITCHPORT MODE TRUNK. | |
| dmaftei 2001-05-21, 5:21 pm |
| quote:
Originally posted by strikeattack
If you have more than one switch participating in VLANS, don't forget to set up ISL by SWITCHPORT MODE TRUNK.
You're probably right, but I don't see how trunking affects the broadcast domains.
Cheers! | |
| strikeattack 2001-05-21, 5:31 pm |
| By default, Switches are configured in VLAN 0. If you don't set up trunk ports, you will not be able to propagate frames from VLANs other than 0. ISL is the protocol used to transport multiple broadcast domains across the wire from switch to switch. Trunking is a way to carry traffic from several VLANs over a point-to-point link between the two devices.
Two ways that Ethernet trunking can be implemented are:
ISL (Cisco proprietary protocol)
802.1q (IEEE standard)
Trunking doesn't "affect" broadcast domains, it simply makes them available on other switches. |
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