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• 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
A change in the ASN notation type is dynamically applied to the running-config statements.
When you apply or change an ASN notation, the type selected is reflected immediately in the running-
configuration and the show commands (refer to the following two examples).
Example of Dynamic Changes in the Running Configuration When Using the bgp asnotation
Command
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>
Dell(conf-router_bgp)#do show ip bgp
BGP table version is 24901,
local router ID is 172.30.1.57
<output truncated>
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>
Dell(conf-router_bgp)#do show ip bgp
BGP table version is 31571, local router ID is 172.30.1.57
<output truncated>
AS-PLAIN
Dell(conf-router_bgp)#bgp asnotation asplain
Dell(conf-router_bgp)#sho conf
!
router bgp 100
bgp four-octet-as-support
neighbor 172.30.1.250
local-as 65057
<output truncated>
Dell(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 IPv4 (BGPv4)
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