Cabletron Systems Netlink FRX4000 User Manual page 164

Host MAC Address
Session Type
9-22
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 FRX4000/6000 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
1. Break the address into pairs of digits:|
2. Reverse the digits within each pair: |
3. Replace each digit as specified in the following table. This reverses the binary bits
of each digit. For example,
Digit Convert to
0 0
1 8
2 4
3 C
Using the example,
converts to:
4. Enter the bit swapped value (e.g.,
value will arrive at the host as the proper address (e.g.,
translated.
if Originated, means the FRX4000/6000 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
the FRX4000/6000 databases as follows:
Example 1: One record in FRX4000/6000 2 for the host, with
=
Type Terminated
Example 2: One record in FRX4000/6000 1 for the host, with
=
Type Originated
=
Type Terminated
Example 3: Two records in the FRX4000/6000 for the host, one with
=
Type Originated
Example 4: One record in the FRX4000/6000 for the host, with
=
Type Originated
400010001088
40 | 00 | 10 | 00 | 10 | 88 |
04 | 00 | 01 | 00 | 01 | 88 |
( binary) becomes
7 0111
Digit Convert to
4 2
5 A
6 6
7 E
| 04 | 00 | 01 | 00 | 01 | 88 |
| 02 | 00 | 08 | 00 | 08 | 11 |
020008000811
Figure 9-1 (on page 9-3), LLC2 hosts must be configured in
.
, one record in FRX4000/6000 2 for the host, with
.
, the other .
Terminated
.
:
( binary).
E 1110
Digit Convert to Digit Convert to
8 1 C
9 9 D
A 5 E
B D F
) as the Host MAC Address. This
400010001088
Session
Session
FRX4000/FRX6000 4.0 User Guide, Rev 01
3
B
7
F
) after being
Session
Session
Session