Hello @rhap4boyz,
To find out what the BGP communities 202:110 and 202:202 map to, you can refer to the BGP community documentation provided by your ISPs. Typically, ISPs define and document their BGP communities and their intended meanings. Contact your ISPs' technical support or consult their documentation to understand the specific mappings for the communities you are using.
To determine whether the AS path prepending is taking effect from the ISP's perspective, you can use the following steps:
--Verify that the BGP session is established and the routes are being received from the ISPs. Use the command "sh ip bgp summary" to view the BGP session status and ensure that the BGP neighbors are established.
--Use the command "sh ip bgp" to examine the BGP routing table entries received from the ISPs. Look for the prefixes advertised by the ISPs and check their AS paths. Confirm whether the AS path contains the desired number of AS prepends.
--Use the command "show ip bgp neighbor <neighbor-IP> advertised-routes" to view the routes being sent to the ISP. Verify that the AS path being advertised to the ISPs includes the desired number of AS prepends.
--If you couldn't find the required information using the ISP's looking glass service, you can try using an external looking glass service. There are various public looking glass services available that allow you to query the BGP routes and AS path information from multiple perspectives. Examples of popular looking glass services include Hurricane Electric (http://lg.he.net) and bgp.tools (https://bgp.tools/).
Best regards
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