Chapter 4 Managing Miscellaneous Commands
Avaya M770 ATM Switch User’s Guide 33
Viewing or changing the switch prefix
When a M770 ATM Switch with a blank EEROM is powered up, a default prefix is
generated and stored in the EEROM.
The default prefix is 39.00.00.00.00.00.00.xx.xx.xx.xx.xx.xx where x is the MAC
address of the switch.
Note that the first byte of all switch prefixes must start with one of the following:
• 39. An ATM Forum Identifier (AFI) for the Data Country Code (DCC). This is
allocated and assigned to countries and administered by the ISO member for
that country.
• 47. An AFI for the International Code Designator (ICD). This is allocated and
assigned to countries, and administered by an ISO registration authority for that
country, for example the British Standards Institute (BSI).
• 45. An AFI for E.164 encapsulated. This is useful for organizations who wish to
use the existing number plan used in public networks.
• 49. The local AFI that defines a structure that can be used by anyone within a
private network.
To display the current switch prefix, use the address prefix command.
If you have an ATM network that uses its own block of ATM addresses, you can
make the M770 ATM S witch conform to this scheme by ch anging the default switch
prefix. Any end-stations directly connected to the M770 ATM Switch will only
obtain their new prefix if they re-register over ILMI.
To change the switch prefix for the M770 ATM Switch, use the address prefix
command.
Note: You must reboot the switch before the above command will take affect. You
must update all the other affected switches’ static routing table entries with the new
switch prefix. If you are using PNNI routing then the affected routing entries will be
updated automatically.
Command: M15-155s8:/>address prefix
Output: Current Prefix: 39.00.00.00.00.00.00.00.40.0d.87.00.2c
Command: M15-155s8:/>address prefix <prefix> [node_id] [pg_id]
Parameters: <prefix> The new switch prefix. The prefix must be a 13-byte address and
expressed as 13two-digit hexadecimal numbers separated by periods.
(39.00.01.02.03.04.05.06.07.08.09.aa.bb) is an example of a switch
prefix address.
The first byte of the switch prefix address must be 39, 45, 47 or 49. For
more information see text in the introduction to this section.
[node_id] Optional parameter that indicates that the PNNI node ID shall be
changed according to the new prefix
[pg_id] Optional parameter that indicates that the PNNI peer group ID shall
be changed according to the new prefix