Can someone please confirm if I truly understand the concept of VLANs communicating through different Switch Blocks...
VLAN A is configured on an access switch which in turn is direcltly connected to the multilayer distribution Switch1. Switch1 is directly connected to Switch2 and SW2 is directly connected to a second access switch, again configured with VLANA - all within the same Switch Block. Now, the L2 link connecting SW1 & SW2 will normally use a trunking protocol to transport many VLANs - say ISL. In other words trunking is used within a Switch Block.
I start to get troubles understanding how hosts on VLANA communicate with hosts in VLANA configured in another Switch Block. As far as I can make out L3 routing is used between the Distribution layer and the Core so does this mean that trunking is only used between distribution layer switches within the same Switch Block? How is the VLAN information preserved when routed through the Core?
Thanks for clearing this up for me