BGP Peer & Route Advertising

DForde — Tue, 22 Nov 2022 16:30:20 GMT

Hi All,

I have followed a few guides but cannot manage to get a /30 RIPE subnet advertised to our ISP. I have followed the following guide for route distribution, however, i cannot see them in the Local RIB and RIB out tables. https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000Cm2ICAS

Any help is greatly appreciated. Our ISP is peering okay but as mentioned when trying to advertise the /30 (as 4 * /32s - not sure if that is possible - i would have thought so, this is ISP/BGP is relatively new to me). I need 4 public IPs to allow DNAT into our site on this connection.

Thanks in advance.

Re: BGP Peer & Route Advertising

PavelK — Tue, 22 Nov 2022 21:46:23 GMT

Hello @DForde

thanks for the post in LIVEcommunity!

Even if you manage to inject /30 routes into routing table and advertise this from PA to your ISP, ISP will typically not allow longer prefix than /24 for IPV4 and /48 for IPv6. /30 should be filtered out by your ISP you are peering with. This is part of the effort of all governing body to conserve number of prefixes in global routing table.

Kind Regards

Pavel

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BGP Peer & Route Advertising

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