Reference Guide

206 | Border Gateway Protocol IPv4 (BGPv4)
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• 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 (.): <high-order 16 bit value>.<low-order 16 bit value>. Some examples are shown in
Table 12-2, "4-Byte ASN Dot Format Examples," in Border Gateway Protocol IPv4 (BGPv4).
• 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 <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 using the
decimal method (asdot+). For example, the AS Number 65526 appears as 65526, and the AS Number
65546 appears as 1.10.
Dynamic AS Number Notation application
FTOS 8.3.1.0 applies the ASN Notation type change dynamically to the running-config statements. When
you apply or change an asnotation, the type selected is reflected immediately in the running-configuration
and the show commands .
Example: Dynamic changes of the bgp asnotation command in the show running config.
ASDOT
FTOS(conf-router_bgp)#bgp asnotation asdot
FTOS(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>
FTOS(conf-router_bgp)#do show ip bgp
BGP table version is 24901, local router ID is 172.30.1.57
<output truncated>
ASDOT+
FTOS(conf-router_bgp)#bgp asnotation asdot+
FTOS(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>
FTOS(conf-router_bgp)#do show ip bgp