class AsNum

A class for storing an AS number used by protocols such as BGP. More...

 
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Detailed Description

This class can be used to store an AS number that can be either 16 or 32 bits. Originally, the AS numbers were defined as 16-bit unsigned numbers. Later the "extended" AS numbers were introduced, which are unsigned 32-bit numbers.

16-bit numbers are expanded to 32-bit by extending them with 0's in front. 32-bit numbers are represented in a 16-bit path, by a special 16-bit value, AS_TRAN, which will be allocated by IANA. Together with any AsPath containing AS_TRAN, we will always see a NEW_AS_PATH attribute which contains the full 32-bit representation of the path. So there is no loss of information.

The internal representation of an AsNum is 32-bit in host order.

An AsNum must always be initialized, so the default constructor is never called.

static const uint16_t AS_INVALID

AS_INVALID

static const uint16_t AS_TRAN

AS_TRAN

explicit  AsNum (const uint32_t value)

AsNum

Constructor.

Parameters:

valuethe value to assign to this AS number.
explicit  AsNum (const uint16_t value)

AsNum

explicit  AsNum (int value)

AsNum

explicit  AsNum (const uint8_t *d)

AsNum

construct from a 2-byte buffer in memory

uint16_t  as ()

as

[const]

Get the non-extended AS number value.

Returns: the non-extended AS number value.

uint32_t  as32 ()

as32

[const]

Get the extended AS number value.

Returns: the extended AS number value.

void  copy_out (uint8_t *d)

copy_out

[const]

copy the 16-bit value into a 2-byte memory buffer

bool  extended ()

extended

[const]

Test if this is an extended AS number.

Returns: true if this is an extended AS number.

bool  operator== (const AsNum& x)

operator==

[const]

Equality Operator

Parameters:

otherthe right-hand operand to compare against.

Returns: true if the left-hand operand is numerically same as the right-hand operand.

bool  operator< (const AsNum& x)

operator<

[const]

Less-Than Operator

Returns: true if the left-hand operand is numerically smaller than the right-hand operand.

string  str ()

str

[const]

Convert this AS number from binary form to presentation format.

Returns: C++ string with the human-readable ASCII representation of the AS number.

string  short_str ()

short_str

[const]


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