16
Loopback
1
2
4
5
1
2
4
5
MAC Dst MAC Src
IP Src
IP Dst
MAC Dst
MAC Src
IP Src
IP Dst
Figure 5.2. Loopback at the data link layer
Note:
if a frames destination MAC address is not equal to the MAC
address of
ETS-1000L
, the frame will not be retransmitted.
Note:
frames with equal destination and source MAC address are not
retransmitted at the data link, network and transport layers.
•
At the
Network layer (L3)
the incoming traffic (without error packets)
is being retransmitted backward with source and destination IP and MAC
addresses swapping.
Note:
the frame will be retransmitted only if a frames destination
MAC address and destination IP address are equal to the MAC and
IP address of
ETS-1000L
.
1
2
4
5
1
2
4
5
MAC Dst MAC Src
IP Src
IP Dst
MAC Dst
MAC Src
IP Src
IP Dst
Figure 5.3. Loopback at the network layer
•
At the
Transport layer (L4)
the incoming traffic (without error pack-
ets) is being retransmitted backward with source and destination IP and
MAC addresses swapping and source and destination TCP/UDP addresses
swapping.
ETS-1000L. Operating manual
Summary of Contents for ETS-1000L
Page 1: ...ETS 1000L Ethernet Gigabit Ethernet loopback Operating manual Version 1 0 1 2009 Metrotek ...
Page 4: ...4 ETS 1000L Operating manual ...
Page 6: ...6 ETS 1000L Operating manual ...
Page 8: ...8 ETS 1000L Operating manual ...
Page 12: ...12 ETS 1000L Operating manual ...
Page 14: ...14 ETS 1000L Operating manual ...
Page 18: ...18 ETS 1000L Operating manual ...
