As4 Number Representation - Dell Force10 C150 Configuration Manual

Where the 2-Byte format is 1-65535, the 4-Byte format is 1-
traditional format. If the ASN is greater than 65535, the dot format is shown when using the
commands. For example, an ASN entered as 3183856184 will appear in the show commands as
48581.51768; an ASN of 65123 is shown as 65123. To calculate the comparable dot format for an ASN
from a traditional format, use ASN/65536. ASN%65536.
Table 10-2. 4-Byte ASN Dot Format Examples
Traditional Format
65001
65536
100000
4294967295
When creating Confederations, all the routers in a Confederation must be either 4-Byte or 2-Byte identified
routers. You cannot mix them.
Configure the 4-byte AS numbers with the

AS4 Number Representation

FTOS version 8.2.1.0 supports multiple representations of an 4-byte AS Numbers:
asdot
.
Note: The ASDOT and ASDOT+ representations are supported only in conjunction with the
Numbers feature. If 4-Byte AS Numbers are not implemented, only ASPLAIN representation is supported.
ASPLAIN is the method FTOS has used for all previous FTOS versions.It remains the default method with
FTOS 8.2.1.0 and later. With the ASPLAIN notation, a 32 bit binary AS number is translated into a
decimal value.
• All AS Numbers between 0-65535 are represented as a decimal number when entered in the CLI as
well as when displayed in the show command outputs.
• AS Numbers larger than 65535 are represented using ASPLAIN notation as well.
represented as 65546.
ASDOT+ representation splits the full binary 4-byte AS number into two words of 16 bits separated by a
decimal point (.): <high-order 16 bit value>.<low-order 16 bit value>. Some examples are shown in
Table 10-2.
• All AS Numbers between 0-65535 are represented as a decimal number, when entered in the CLI as
well as when displayed in the show command outputs.
• AS Numbers larger than 65535 is represented using ASDOT notation as <higher 2 bytes in
decimal>.<lower 2 bytes in decimal>. For example: AS 65546 is represented as 1.10.
Dot Format
Is 0.65501
The
1.0
Same As 1.34464
65535.65535
four-octect-support
4294967295
. Enter AS Numbers using the
command.
asplain
Border Gateway Protocol IPv4 (BGPv4) | 219
show ip bgp
asdot+
, , and
4-Byte AS
65546 is