Beta Draft Confidential
About SVCs
Address Formats
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/0516-5
Initial domain identifier (IDI) – A hex code that identifies the sub-authority that
has allocated the address. The format depends on the following address types:
Domain Specific Part — Consists of the HO-DSP, EDI, and SEL fields.
High-order domain specific part (HO-DSP) – The authority specified in the
AFI/IDI octets determines the format of this field. It identifies a segment of
address space that is assigned to a particular user or subnetwork. It should be
constructed to facilitate routing through interconnected ATM subnetworks. The
general format for each address type as shown in Table 16-3.
End System Identifier (ESI) – A 6-octet (12 hex digit) field that uniquely identifies
the end system within the specified subnetwork. This is typically an IEEE MAC
address.
Selector (SEL) – A 1-octet (2 hex digit) field that is not used for ATM routing, but
may be used by the end system.
Table 16-2. IDI Default Values
Address Type IDI Description
DCC (including
Anycast)
Consists of 2 octets (4 hex digits) that identify the
country in which this address is registered. The DCC is
generally considered a three digit quantity with a
trailing hex “f” semi-octet. For example, the ANSI IDI
of 840 is encoded as 0x840f.
ICD (Anycast) Consists of 2 octets (4 hex digits) that identify an
international organization to which this address is
registered. The ICD is generally considered a four digit
quantity. For example, the US GOSIP IDI of “5” is
encoded as 0x0005.
E.164 (Anycast) Consists of 8 octets in BCD format (1-15 hex digits,
plus a trailing Fh; if less than 15 digits are entered, type
leading zeros to fill the 8 octets). Represents an
international E.164 address. For example, the E.164
address of 978-555-1212 is encoded as
0x000009785551212f.
Table 16-3. HO-DSP Default Values
Address Type HO-DSP Description
DCC, ICD (including
Anycast)
Consists of 10 octets (20 hex digits)
E.164 (Anycast) Consists of 4 octets (8 hex digits)
Custom Consists of 12 octets (24 hex digits)
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