D-Link DGS-6600-48T Product Manual - Page 78

DGS-6604 bgp asnotation dot bgp asnotation dot Use this command to change the default display and regular expression match format of BGP 4-byte AS numbers from asplain (decimal values) to dot notation. Use the no form of the command to reset the default 4-byte autonomous system number display and regular expression match format to asplain. bgp asnotation dot no bgp asnotation dot Syntax None Default Command Mode BGP AS numbers are displayed using asplain (decimal value) format in screen output, and the default format for matching 4-byte autonomous system numbers in regular expressions is asplain. Router configuration Usage Guideline BGP AS numbers that were allocated to companies were 2-byte numbers in the range from 1 to 65535 as described in RFC 4271. Due to increased demand for AS numbers, the IANA will start, in January 2009, to allocate four-byte AS numbers in the range from 65536 to 4294967295. RFC 5396 documents three methods of representing autonomous system numbers. BGP has implemented the following two methods: • Asplain-Decimal value notation where both 2-byte and 4-byte AS numbers are represented by their decimal value. For example, 65525 is a 2byte AS number and 65545 is a 4-byte autonomous system number. • Asdot-Autonomous system dot notation where 2-byte AS numbers are represented by their decimal value and 4-byte AS numbers are represented by a dot notation. For example, 65525 is a 2-byte autonomous system number and 1.10 is a 4-byte AS number (this is dot notation for the 65545 decimal number). Example After the command is performed, the output is converted in order to format it. For some of the information which is learned prior, for example: routes, the AS notation format follows the previous format. Therefore, the clear ip bgp command on page 94 must be used to convert to the current format. This example (on the next page) shows how to configure asnotation and shows the difference using the command show ip bgp: CLI Reference Guide 68