Enabling communication between different VLANs using switches

1545 pts.
I have 3 switches A, B and C; connected to each other (may or may not be a trunk link). Switch A has a user at VLAN 10 and Switch C has a user at VLAN 10. Any communication between A & C has to pass through Switch B. So can Switch A user ping the user at Switch C, if yes how? if no why?

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When all switches are connected to each other, you need to enable trunking on switch B so that users can ping each other. You can also convert them to a big collision domain so that users on each switch can talk to each other.

for as long as there are two or more vlans in a switch, its interface connected to anoother switch or device <not a host or a PC> must be configured as a trunk. if one is configured as a trunk and other is not, there will be incompatibility.

If you configure the interface connection between the 3 switches as a trunk, it can deinetely communicate.

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  • Troy Tate
    You don't mean "collision" domain do you? That's a hub characteristic. I think you mean "broadcast" domain. It depends on whether the broadcast domain is at layer 2 or layer 3. This is done through variable length subnet masks and how you roll-up the network addressing scheme. I agree that trunking will need to be enabled on the uplink ports between each of the switches. Note that not all switches implement trunking the same way.
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  • Jfernatt
    I have to say to answer your question... It depends... There are several factors that would determine whether or not your endpoints could ping one another. If all switches are trunking and VLAN 10 exists and is allowed on the trunk links across all switches they will be able to ping. However they do not HAVE to trunk. In fact switch B does not even HAVE to use VLAN 10 for the ports connecting to each other switch as long as both of those ports are in the same VLAN. Things that would make the endpoints unable to ping include trunked ports that do not allow your specific VLAN or if the 2 ports on each switch are not in the same vlan if they are configured as access ports. And I am assuming the 2 endpoints share the same IP subnet...
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  • Patilnet
    If there is a trunk bettween Switch A &Switch B and Switch B & Switch C then only Switch A user can Ping Switch C users Because trunk carrries multiple VLAN database
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