The following example shows verifying the BGP configuration.R2#show running-config bgp!router bgp 65123bgp router-id 192.168.10.2network 10.10.21.0/24network 10.10.32.0/24network 100.10.92.0/24network 192.168.10.0/24bgp four-octet-as-supportneighbor 10.10.21.1 remote-as 65123neighbor 10.10.21.1 filter-list ISP1inneighbor 10.10.21.1 no shutdownneighbor 10.10.32.3 remote-as 65123neighbor 10.10.32.3 no shutdownneighbor 100.10.92.9 remote-as 65192neighbor 100.10.92.9 no shutdownneighbor 192.168.10.1 remote-as 65123neighbor 192.168.10.1 update-source Loopback 0neighbor 192.168.10.1 no shutdownneighbor 192.168.12.2 remote-as 65123neighbor 192.168.12.2 update-source Loopback 0neighbor 192.168.12.2 no shutdownR2#Configuring AS4 Number RepresentationsEnable one type of AS number representation: ASPLAIN, ASDOT+, or ASDOT.Term DescriptionASPLAIN Default method for AS number representation. With the ASPLAIN notation, a 32–bitbinary AS number is translated into a decimal value.ASDOT+ A representation that splits the full binary 4-byte AS number into two words of 16 bitsseparated by a decimal point (.): ..ASDOT A representation that combines the ASPLAIN and ASDOT+ representations. AS numbersless than 65536 appear in integer format (asplain); AS numbers equal to or greater than65536 appear using the decimal method (asdot+). For example, the AS number 65526appears as 65526 and the AS number 65546 appears as 1.10.NOTE: The ASDOT and ASDOT+ representations are supported only with the 4-Byte AS numbers feature.If you do not implement 4-Byte AS numbers, only ASPLAIN representation is supported.Only one form of AS number representation is supported at a time. You cannot combine the types ofrepresentations within an AS.To configure AS4 number representations, use the following commands.• Enable ASPLAIN AS Number representation.CONFIG-ROUTER-BGP modebgp asnotation asplainNOTE: ASPLAIN is the default method used to represent AS numbers and does not appear in theconfiguration display.Border Gateway Protocol IPv4 (BGPv4) 214
