Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 149
AS4 Number Representation, ASN/65536. ASN%65536.
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Where the 2-Byte format is 1-65535, the 4-Byte format is 1-4294967295. Enter AS Numbers using the traditional format. If the ASN is greater than 65535, the dot format is shown when using the show ip bgp 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 8-2. 4-Byte ASN Dot Format Examples Traditional Format Dot Format 65001 65536 Is 0.65501 The 1.0 100000 Same As 1.34464 4294967295 65535.65535 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 four-octet-support command. AS4 Number Representation FTOS version 8.2.1.0 supports multiple representations of an 4-byte AS Numbers: asplain, asdot+, and asdot. Note: The ASDOT and ASDOT+ representations are supported only in conjunction with the 4-Byte AS 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. 65546 is represented as 65546. ASDOT+ representation splits the full binary 4-byte AS number into two words of 16 bits separated by a decimal point (.): .. Some examples are shown in Table 8-2. • 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 .. For example: AS 65546 is represented as 1.10. Border Gateway Protocol IPv4 (BGPv4) | 149
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