BGP V7 filter question

RouterOS Forwarding Protocols
1

Hi, I have a question about BGP filters in V7. If I want to filter by source ASN, but I have multiple sources, can I put them in a single instruction like this?

"if(bgp-input-remote-as=20000 30000 40000 50000 60000) {accept}"

or do I have to put each line in different scripts?

I appreciate it in advance.

2

Add all numbers in num-list, and then use that numlist in a single rule.

3 
if(bgp-input-remote-as==20000||bgp-input-remote-as==30000||bgp-input-remote-as==40000||bgp-input-remote-as==50000||bgp-input-remote-as==60000) {accept}

or use num-list as mentioned by @mrz

4

Thank you for your help. I apologize for the questions, but this is the first time I’m going to use this option. How can I generate a num-list in V7?

5

Check “num-list” in “https://help.mikrotik.com/docs/display/ROS/Route+Selection+and+Filters”. You can also use regex as described in the section “Regex Testing Tool”

Example of num-list:

/routing/filter/num-list 
add list=MYLIST-AS range=20000 
add list=MYLIST-AS range=30000 
add list=MYLIST-AS range=40000

"if (bgp-as-path [[:MYLIST-AS:]]){ accept }"
6

Thank you all for taking the time to reply