[Solved] BGP Established but Routes Invalid

Started by KoNICEA, March 27, 2025, 05:43:18 PM

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March 27, 2025, 05:43:18 PM Last Edit: March 29, 2025, 09:43:21 AM by KoNICEA
Hi Guys,
i just configured a new BGP session.
The session's established and i get correctly the routes. However the routes are invalid and are not added to routing table.

Can someone help me?
I attached you the screens.
Really thanks.

March 28, 2025, 11:49:56 AM #1 Last Edit: March 29, 2025, 09:44:34 AM by KoNICEA
I found it.
I used different Subnet between Sites of VPN.

Site A
(169.254.10.0/24)
Site B
(169.254.20.0/24)

but I cannot use as Next-Hop an IP that I reach with routing. So the solution is create VPN with Single IP P2P

Site A
(169.254.10.1)
Site B
(169.254.10.2)

Read below
March 28, 2025, 12:19:57 PM #2
Why are you using APIPA address space for your transfer network instead of RFC 1918?
Deciso DEC750
People who think they know everything are a great annoyance to those of us who do. (Isaac Asimov)
March 28, 2025, 12:58:29 PM #3 Last Edit: March 28, 2025, 01:18:37 PM by KoNICEA
Quote from: Patrick M. Hausen on March 28, 2025, 12:19:57 PMWhy are you using APIPA address space for your transfer network instead of RFC 1918?

I saw an example on internet.
But now it doesn't work again... It doesn't have sense.
I tried with RFC 1918 also, but nothing... I don't know why...

Edit.
I just read that I should use GRE/IPIP interface... I try and will let know you
March 29, 2025, 12:53:32 AM #4
Now it works.
I confirm that you have to:

  • Create a VPN IPSEC Tunnel
  • Create a GRE interface on VPN Tunnel
  • Create BGP Session using IP on GRE interface
  • Reduce Amministrative Distance and Metric to use correctly new routes
  • Set MTU 1400 and MSS 1360 on GRE Interface.
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