Cabletron Systems Netlink FRX8000, User Manual, Page: 170 / 468

11-22 FRX8000 3. 0 User G uide, Rev 02
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 FRX8000, this
address must be entered as a “bit-swapped” (or non-canonical) translation of the
address that the node is expecting. 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
0 0 4 2 8 1 C 3
1 8 5 A 9 9 D B
2 4 6 6 A 5 E 7
3 C 7 E B D F F
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 FRX8000 will initiate LLC2 sessions from the configured
Host MAC Address. If Terminated, the FRX8000 will accept LLC2 sessions destined
for the host address.
In the examples shown in Figure 11-1 (on page 11-1), LLC2 hosts must be configured
in the FRX8000 database as follows:
●
Example 1: One record in Node 2 for the host, with
Session Type
=
Terminated
.
●
Example 2: One record in Node 1 for the host, with
Session Type
=
Originated
,
one record in Node 2 for the host, with
Session Type
=
Terminated
.
●
Example 3: Two records in the node for the host, one with
Session Type
=
Originated
, the other
Terminated
.
●
Example 4: One record in the node for the host, with
Session Type
=
Originated
.
Reply Timer - T1
is used to detect the failure to receive a required acknowledgment or response from
the remote link station. The link station will start the timer when it transmits one of
these:
●
an Information LPDU (LLC protocol data unit).
●
a Command LPDU with the
P
bit set to
B‘1’
. (If this LPDU is sent while the timer
is already running, the link station will reset and restart it.)