Switched network infrastructure
Switch operates at the data link layer, the MAC address forwarding data frames
After a switch receives a broadcast host, will be sent as a broadcast from other interfaces out, this process is called flooding.
Mac address switch link interface corresponding to learn from the broadcast, the writing table mac
dis mac-address mac Table View
Isolate broadcast router, the router each port is a broadcast domain
Forwarding behavior of switches are:
1 Flooding
Flooding in these cases:
1 Broadcast
2 unknown unicast frame
3 multicast frames
2 forward
One pair of known unicast frame
3 discarded
VLAN technology:
In the same broadcast domain, broadcast isolation logically ---- virtual local area network
Between different vlan can not access each other's
vlan identifier id range 0-4095 and 4095 can not be used where 0 is reserved
For vlan arranged on the interface of the exchange, the interface is arranged vlan several, contact the above host belong to several vlan,
When this message is sent to the host switch interface, the switch package identification tag on a message id to identify the vlan
Link Type:
The link between the host and switch becomes user access link ---- Access, allows only one kind by vlan
The link between the switch and the trunk link is a trunk switch
trunk link allows multiple vlan through.