Concept Guide

• 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
Dell EMC Networking OS applies the ASN notation type change dynamically to the running-cong statements.
When you apply or change an notation, 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
ASDOT
DellEMC(conf-router_bgp)#bgp asnotation asdot
DellEMC(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>
DellEMC(conf-router_bgp)#do show ip bgp
BGP table version is 24901,
local router ID is 172.30.1.57
<output truncated>
ASDOT+
DellEMC(conf-router_bgp)#
bgp asnotation asdot+
DellEMC(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>
DellEMC(conf-router_bgp)#do show ip bgp
BGP table version is 31571,
local router ID is 172.30.1.57
<output truncated>
AS-PLAIN
DellEMC(conf-router_bgp)#bgp asnotation asplain
DellEMC(conf-router_bgp)#sho conf
!
router bgp 100
bgp four-octet-as-support
neighbor 172.30.1.250 local-as 65057
<output truncated>
DellEMC(conf-router_bgp)#do sho ip bgp
BGP table version is 34558, local router ID is 172.30.1.57
<output truncated>
Border Gateway Protocol (BGP)
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