Information Technology Reference
In-Depth Information
5.
ATM Address: 47.009181000000006047508401.006047508402.0
This is interesting only when we check other LECs'
sh lane client
to find that the remote side of a
data direct is this station.
6.
0 0 0 configure 47.009181000000006047508401.006047508405.00
This line gives detail on the connection to the LECS; this VCC is called the configure direct, as the
Type field suggests. The VCD number is 0 because the connection is torn down, per the spec.
7.
256 1 10 direct 47.009181000000006047508401.000000000002.01
This line gives details on the connection to the LES; this VCC is called the control direct, as
suggested by the Type field.
8.
257 476 0 distribute 47.009181000000006047508401.000000000002.01
This line gives details on the connection from the LES to all LECs. It is called the control distribute.
We can see that the LES address is the same for the control direct and control distribute, as it should
be.
9.
258 0 56 send 47.009181000000006047508401.000000000003.01
This line gives details on the connection to the BUS. It is called multicast send, as the Type field
suggests.
10.
259 2 0 forward 47.009181000000006047508401.000000000003.01
This line gives details on the connection from the BUS to all LECs. It is called multicast forward.
We can see that the BUS address is the same for the multicast send and multicast forward.
11.
263 1 18 data 47.009181000000006047508401.006047508402.00
The remaining lines give details on each data direct VCC. Refer to the section “Understanding the
LE_ARP Process” for more details.
Understanding the LE_ARP Process
The LAN Emulation Address Resolution Protocol is one of the most important in LANE. When a LEC
must forward a unicast frame (that is, a frame with the destination MAC address set to the real MAC
address), it should not forward it to the BUS.
Practically, it will try to create a mapping between this destination MAC address and the ATM address
of the LEC to be contacted to reach this station. The LEC can be a LANE module, a router, or a directly
attached station. This process is called LE_ARP. Waiting for this process to complete, the source LEC
will forward the traffic to the BUS as unknown traffic.
Let's examine this in details. Say that we have the following topology:
IP station-----(ethernet connection)-----catalyst----(ATM lane module)------ls1010
10.200.10.61
