HOL Blocking
HOL Blocking
2
1
1
2
The packet destined for
port 2 is blocked by the
packet destined for port 1.
1
1
2
2
1
1
2
The packet destined for
port 2 is blocked by the
packet waiting for port 1.
1
No packet is available
to go to port 2.
All of these conditions cause port 2 to be idle,
reducing its total capacity. But they will not
by themselves cause packets to be lost.