BGP's latest AS number: 4-byte-as conversion to decimal and AS number compatibility

The AS number can be made into dotted decimal like the IP address. If you use the 4-byte AS number bgp 255.255, how to convert it to decimal

First convert 255.255 to hexadecimal: FF.FF

Second, convert it to 4 bytes and remove the middle point: 00FF.00FF = 0x00FF00FF

Finally change it to decimal system: 0x00FF00FF = 16711935

So bgp 255.255 = bgp 16711935, other AS numbers are similar

The following is AS number compatibility:

When the party that supports 4-byte-as sees my as = 23456, it goes to find the real AS number under optional parameters.

When the party that does not support 4-byte-as sees that my as = 23456, it thinks that the negotiation on AS failed and ends by sending notification.

Both parties can negotiate successfully regardless of whether or not the two parties support capability-advertise 4, by by, as, as, between 0 and 65535.

You can also manually turn off the 4-byte-as capability:

Undo peer 2.2.2.2 capability-advertise 4-byte-as

Maybe the time relationship is inaccurate in some places. I hope I can correct it.