Administrator Guide

Traditional
Format
DOT Format
65001 0.65501
65536 1.0
100000 1.34464
4294967295 65535.65535
When creating Confederations, all the routers in a Confederation must be either 4-Byte or 2-Byte identied routers. You cannot mix
them.
Congure 4-byte AS numbers with the four-octet-support command.
AS4 Number Representation
The Dell Networking OS version 8.2.1.0 supports multiple representations of 4-byte AS numbers: asplain, asdot+, and asdot.
NOTE: The ASDOT and ASDOT+ representations are supported only with the 4-Byte AS numbers feature. If 4-Byte AS
numbers are not implemented, only ASPLAIN representation is supported.
ASPLAIN is the method the Dell Networking OS has used for all previous Dell Networking OS versions. ASPLAIN remains the default
method with the Dell Networking OS version 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 and 65535 are represented as a decimal number when entered in the CLI and when displayed in the
show commands output.
• AS numbers larger than 65535 are represented using ASPLAIN notation. When entered in the CLI and when displayed in the
show commands output, 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 (.): <high-
order 16 bit value>.<low-order 16 bit value>. Some examples are shown in the following table.
• All AS numbers between 0 and 65535 are represented as a decimal number, when entered in the CLI and when displayed in the
show commands 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.
ASDOT representation combines the ASPLAIN and ASDOT+ representations. AS numbers less than 65536 appear in integer format
(asplain); AS numbers equal to or greater than 65536 appear in the decimal format (asdot+). For example, the AS number 65526
appears as 65526 and the AS number 65546 appears as 1.10.
Dynamic AS Number Notation Application
The Dell Networking OS version 8.3.1.0 applies the ASN notation type change dynamically to the running-cong statements.
When you apply or change an asnotation, the type selected is reected immediately in the running-conguration and the show
commands (refer to the following two examples).
Example of Dynamic Changes in the Running Conguration When Using the bgp asnotation Command
Example of the Running Conguration When AS Notation is Disabled
ASDOT
Dell(conf-router_bgp)#bgp asnotation asdot
Dell(conf-router_bgp)#show conf
!
router bgp 100
bgp asnotation asdot
bgp four-octet-as-support
neighbor 172.30.1.250 local-as 65057
<output truncated>
160
Border Gateway Protocol IPv4 (BGPv4)