as-notation plain

Function

The as-notation plain command configures a BGP 4-byte AS number to be displayed as an integer.

The undo as-notation plain command configures a BGP 4-byte AS number to be displayed in dotted notation.

By default, a BGP 4-byte AS number is displayed in dotted notation (that is, in the format of x.y).

Format

as-notation plain

undo as-notation plain

Parameters

None

Views

System view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

By default, display commands such as the display bgp peer command display 4-byte AS numbers in dotted notation.

To display a 4-byte AS number as an integer, run the as-notation plain command. After the as-notation plain command is run, display commands display all 4-byte AS numbers as integers. These 4-byte AS numbers include:

Independent 4-byte AS number
4-byte AS number in an extended community attribute
4-byte AS number in a route distinguisher (RD)
4-byte AS number in a VPN target (also called a route target)
4-byte AS number in the Site-of-Origin attribute

Assume that a 4-byte AS number in dotted notation is x.y. Following is the conversion relationship between an integral 4-byte AS number and a 4-byte AS number in dotted notation:

Integral 4-byte AS number = x x 65536 + y

For example, if a 4-byte AS number in dotted notation is 2.3, the corresponding integral 4-byte AS number is 131075 (2 x 65536 + 3).

Precautions

After the as-notation plain command is run, the formats of 4-byte AS numbers in configuration information generated by the system do not change.

If integral 4-byte AS numbers are configured, 4-byte AS numbers in configuration information generated by the system are also displayed as integers.
If 4-byte AS numbers in dotted notation are configured, 4-byte AS numbers in configuration information generated by the system are also displayed in dotted notation.

Changing the format of 4-byte AS numbers will affect matching results of AS_Path regular expressions and extended community attribute filters. Therefore, if the system is using an AS_Path regular expression or an extended community attribute filter as an import or export policy, you must reconfigure an AS_Path regular expression using the ip as-path-filter command or an extended community attribute filter using the ip extcommunity-filter command after changing the format of 4-byte AS numbers. This reconfiguration ensures that routes match the import or export policy.

If integral 4-byte AS numbers are configured, you must change 4-byte AS numbers in AS_Path regular expressions and extended community attribute filters to integral 4-byte AS numbers.
If 4-byte AS numbers in dotted notation are configured, you must change 4-byte AS numbers in AS_Path regular expressions and extended community attribute filters to 4-byte AS numbers in dotted notation.

Example

# Configure a BGP 4-byte AS number to be displayed as an integer.

<HUAWEI> system-view

[HUAWEI] as-notation plain

Warning: If the configuration takes effect, the regular expression of the filter for 4-byte AS path should be changed to the asplain format, otherwise match will fail. Continue? [Y/N]y

# Configure a BGP 4-byte AS number to be displayed in dotted notation.

<HUAWEI> system-view

[HUAWEI] undo as-notation plain

Warning: If the configuration takes effect, the regular expression of the filter for 4-byte AS path should be changed to the asdot format, otherwise match will fail. Continue? [Y/N]y