Byte As Numbers; As4 Number Representation - Dell Force10 Z9000 Configuration Manual

Ftos configuration guide for z9000 system

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4-Byte AS Numbers

FTOS Version 7.7.1 and later support 4-Byte (32-bit) format when configuring Autonomous System

Numbers (ASNs). The 4-Byte support is advertised as a new BGP capability (4-BYTE-AS) in the OPEN

message. If a 4-Byte BGP speaker has sent and received this capability from another speaker, all the

messages will be 4-octet. The behavior of a 4-Byte BGP speaker will be different with the peer depending

on whether the peer is 4-Byte or 2-Byte BGP speaker.

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 8-2. 4-Byte ASN Dot Format Examples

Traditional Format

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

FTOS version 8.2.1.0 supports multiple representations of an 4-byte AS Numbers:

Note: The ASDOT and ASDOT+ representations are supported only in conjunction with the

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.

Border Gateway Protocol

feature. If 4-Byte AS Numbers are not implemented, only ASPLAIN representation is supported.

four-octet-support

. Enter AS Numbers using the

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