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HS08
HS08
Visitor III
March 27, 2025
Question

BGP Route

  • March 27, 2025
  • 2 replies
  • 547 views

I have 4 spoke connected to the HUB.

HUB LAN 10.103.0.0/16

SPOKE1 10.107.0.0/16

SPOKE2 10.100.0.0/16

SPOKE3 10.102.0.0/16

SPOKE4 10.101.0.0/16

Connection from every spoke to hub use 3 different connection (2 using internet and 1 using WAN)

if we see in the BGP routing why :

route to 10.100.0.0/16 and 10.102.0.0/16 only have one entry?

route to 10.101.0/0/16 and 10.103.0.0/16 (HUB) have 3 entry?

BGP.png

2 replies

Richie_C
Staff
Richie_C
Staff
March 27, 2025

Hi @HS08 

 

I would start by checking if all BGP peers are up  and routes are received from the BGP peer spoke sites. You can do that with get router info bgp sum. Make sure all of the peers are established and the prefix is being received.  you can see the received prefixes in the last column. See the following example:

get_router.jpg

If the BGP sessions are established i would then do the following:

 

get router info bgp network - Check that you see all of the BGP prefixes in the BGP table

 

You can also use the following commands to help make sure that the prefixes are sent and received.

 

get router info bgp neighbors <neighbor-IP> received-routes - Run on the hub 

get router info bgp neighbors <neighbor-IP> advertised-routes - Run on spoke

 

I hope that helps.

    Toshi_Esumi
    SuperUser
    Toshi_Esumi
    SuperUser
    March 27, 2025

    Probably because you're using ADVPN and this particular location lost the tunnel to the HUB. That's why you're getting three same HUB route from other three spokes.

    Toshi

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