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9-22 SmartSwitch 1800 4.0 User Guide, Rev 01
Host MAC Address
is the MAC address of the host or workstation to which an SNA/LLC2 device needs
to connect.
If the host will be attached via an Ethernet interface in the SmartSwitch and the remote
device is attached via a Token Ring, or vice versa, this MAC address will be "bit-
swapped" internally, because of the differences in frame formatting between Ethernet
and Token Ring. In this case, the address must be "bit-swapped" again, so the remote
device will receive an address in the correct format.
Bit swapping is done by reversing the order of the bits (digits) within each byte (pair
of digits) of the hexadecimal address, while leaving the sequence of the bytes
unchanged.
For example, to bit-swap the hex address
400010001088
:
1. Break the address into pairs of digits:|
40 | 00 | 10 | 00 | 10 | 88 |
2. Reverse the digits within each pair: |
04 | 00 | 01 | 00 | 01 | 88 |
3. Replace each digit as specified in the following table. This reverses the binary bits
of each digit. For example,
7
(
0111
binary) becomes
E
(
1110
binary).
Digit
Convert to Digit Convert to Digit Convert to Digit Convert to
00 42 81 C3
18 5A 99 DB
24 66 A5 E7
3C 7E BD FF
Using the example,
| 04 | 00 | 01| 00 | 01 | 88 |
converts to:
| 02 | 00| 08| 00| 08 | 11 |
4. Enter the bit swapped value (e.g.,
020008000811
) as the Host MAC Address. This
value will arrive at the host as the proper address (e.g.,
400010001088
) after being
translated.
Session Type
if
Originated
, means the SmartSwitch 1800 will initiate LLC2 sessions from the con-
figured Host MAC Address. If
Terminated
, the node will accept LLC2 sessions des-
tined for the host address.
In the examples shown in Figure 9-1 (on page 9-3), LLC2 hosts must be configured in
the SmartSwitch databases as follows:
●
Example 1: One record in SmartSwitch 2 for the host, with
Session Type
=
Terminated
.
●
Example 2: One record in SmartSwitch 1 for the host, with
Session Type
=
Orig-
inated
, one record in SmartSwitch 2 for the host, with
Session Type
=
Terminated
.
●
Example 3: Two records in the SmartSwitch for the host, one with
Session
Type
=
Originated
, the other
Terminated
.
●
Example 4: One record in the SmartSwitch for the host, with
Session Type
=
Originated
.