Hi - It was mentioned to me that the VLANs in our network traverse the entire campus - causing unnecessary broadcast throughout LAN.
Each edge/Access switch on each floor (each port of these) is only in the "floor VLAN' - its only the uplink trunk interfaces of these access switches that have "allowed vlan all" enabled. So the access ports dont get all broadcast. - However a Cisco engineer explained that the switches themselves are processing the broadcast traffic from other VLANs. I understand how this could be - however im not sure "what effect" this broadcast would have on the access switch- (given that only the trunk/uplink would receive the broadcast). What "pressure" then as he stated is it putting on the switch. - I understand "allowed all" should not be on - no need to mention this in answer. - thanks Im just trying to learn about broadcast on trunk interfaces - effect on "switch as whole"