. . . 7th Lecture - Networking . . .

[k2s]

[quote author=John Galt link=topic=237832.msg2965563#msg2965563 date=1316124092]
LAN segment ante anni devices connected to tht switch are interconnected. kani vlans lo oka lan lo chinna chinna isolated lan networks ga divide cheyyachu..
[/quote]

for a lay man ..how do u explain , wat is VLAN ?

[k2s]

VLANs are broadcast domains defined within switches to allow control of broadcast, multicast, unicast, and unknown unicast within a Layer 2 device.

[k2s]

Because switches can talk to each other, some ports on switch A can be in VLAN 10 and other ports on switch B can be in VLAN 10. Broadcasts between these devices will not be seen on any other port in any other VLAN, other than 10. However, these devices can all communicate because they are on the same VLAN. Without additional configuration, they would not be able to communicate with any other devices, not in their VLAN.


which is not possible in LAN

[krldr871]

[quote author=k2s link=topic=237832.msg2965583#msg2965583 date=1316124246]
for a lay man ..how do u explain , wat is VLAN ?
[/quote]
lay man ante  sCo_^Y sCo_^Y sCo_^Y
3 diff teams in a company could be on the same LAN, but marketing do not need to know about s/w development..and s/w development team do not care about HR..so 3 VLANS one for each team create cheste, each vlan would be isolated from others..adi inkoka lan laaga act chestadi, allowing broadcast within only tht vlan..

[k2s]

[quote author=John Galt link=topic=237832.msg2965600#msg2965600 date=1316124500]
lay man ante  sCo_^Y sCo_^Y sCo_^Y
3 diff teams in a company could be on the same LAN, but marketing do not need to know about s/w development..and s/w development team do not care about HR..so 3 VLANS one for each team create cheste, each vlan would be isolated from others..adi inkoka lan laaga act chestadi, allowing broadcast within only tht vlan..
[/quote] sHa_clap4

[k2s]

Another important fact is that, on a Cisco switch, VLAN’s are enabled by default and ALL devices are already in a VLAN. The VLAN that all devices are already in is VLAN 1. So, by default, you can just use all the ports on a switch and all devices will be able to talk to one another.

[krldr871]

[quote author=k2s link=topic=237832.msg2965591#msg2965591 date=1316124373]
Because switches can talk to each other, some ports on switch A can be in VLAN 10 and other ports on switch B can be in VLAN 10. Broadcasts between these devices will not be seen on any other port in any other VLAN, other than 10. However, these devices can all communicate because they are on the same VLAN. Without additional configuration, they would not be able to communicate with any other devices, not in their VLAN.


which is not possible in LAN
[/quote]
multiple switches ni kaluputhu oka vlan possible aa..

[k2s]

[quote author=John Galt link=topic=237832.msg2965630#msg2965630 date=1316124846]
multiple switches ni kaluputhu oka vlan possible aa..
[/quote]yes....... main ga VLANs use chesedey anduku.........

part of ur VLAN could be on 1 SWitch ...........& other parts could be on others swtiches........ as far as these switches are interconnected......its fine
how ever.........if there are multiple vlans u need a layer 3 device to route those packets from 1 vlan to another vlan

[krldr871]

[quote author=k2s link=topic=237832.msg2965668#msg2965668 date=1316125147]
yes....... main ga VLANs use chesedey anduku.........

part of ur VLAN could be on 1 SWitch ...........& other parts could be on others swtiches........ as far as these switches are interconnected......its fine
how ever.........if there are multiple vlans u need a layer 3 device to route those packets from 1 vlan to another vlan
[/quote]
interconnected switches unnappudu, router endku multiple vlans unna kani.. sCo_^Y sCo_^Y sCo_^Y

[robo]

[quote author=k2s link=topic=237832.msg2965668#msg2965668 date=1316125147]
yes....... main ga VLANs use chesedey anduku.........

part of ur VLAN could be on 1 SWitch ...........& other parts could be on others swtiches........ as far as these switches are interconnected......its fine
how ever.........if there are multiple vlans u need a layer 3 device to route those packets from 1 vlan to another vlan
[/quote] @gr33d but not possible on all the switches

[robo]

[quote author=John Galt link=topic=237832.msg2965676#msg2965676 date=1316125224]
interconnected switches unnappudu, router endku multiple vlans unna kani.. sCo_^Y sCo_^Y sCo_^Y
[/quote] switches lo routing table untunda ?

[krldr871]

[quote author=ROBO link=topic=237832.msg2965706#msg2965706 date=1316125535]
switches lo routing table untunda ?
[/quote]
undadu..evaru cheyalsina pani vaalle cheyali ani k2s cheppadu  @3$% @3$% @3$%

[robo]

[quote author=John Galt link=topic=237832.msg2965714#msg2965714 date=1316125581]
undadu..evaru cheyalsina pani vaalle cheyali ani k2s cheppadu  @3$% @3$% @3$%
[/quote] @3$% @3$% *7*^

[k2s]

[quote author=John Galt link=topic=237832.msg2965676#msg2965676 date=1316125224]
interconnected switches unnappudu, router endku multiple vlans unna kani.. sCo_^Y sCo_^Y sCo_^Y
[/quote]that's our next topic.......

if u see as a packet traverses down the line

[img]http://i51.tinypic.com/2ccqput.gif[/img]

this is till packet in Layer 2. As it traverses down to physcial layer...... Layer 2 header / tail adds to it...

[img width=900 height=416]http://i54.tinypic.com/2eal6pl.png[/img]


And switches do not change the VLAN ID. It is the layer device - a router - can only change VLAN ID in an IP packet

[k2s]

[quote author=ROBO link=topic=237832.msg2965706#msg2965706 date=1316125535]
switches lo routing table untunda ?
[/quote]

No...... for pure Layer switches.... models below c3560

For layer 3 switches (models c3560 & above) u enable routing ( ip routing) to act as router. u can see the routing table by issuing "sh ip route"