Traffic is not shifted to ISP 1

[sasteshirish1]

Hi All,

Guys I need to your help to come out from the issue:-

We have terminated the 2 ISP on our router (only 1 router).we have advertised 2 subnet of /24 to ISP1 & /23 to the ISP 2 .& implemented the BGP with our own BGP ASN.we have configured our own public IP to the inside of router interface G0/0 (103.x.x.x). ISP 1 is my primary with weight value 100 G0/2 & ISP2 is my secondary G0/1.

Now I ‘m facing the below situation:-

• When I shut the ISP 1port i.e. G0/2 then my VPN tunnel traffic is shifted to ISP 2 which works fine.
• When I bring the up ISP 1 port i.e. G0/2 the VPN tunnel traffic is working fine.
• But when I shut the port of ISP 2 i.e. G0/1 then my whole VPN traffic is goes down & never come up.
• After that when I bring up ISP 2 port i.e. G0/2 then my VPN traffic comes up.

So guys could you please provide me suggestion.

[Philip D'Ath]

Are you sure ISP1 is accepting your two /24 prefixes?  Try asking them.

[Philip D'Ath]

Have you verified that your default route changes to ISP1 when the ISP2 port is shutdown?

Did you wait at least 90s for the remote BGP peer to shutdown?

[sasteshirish1]

Yes I can see default route as ISP 1 &I had wait more than 5 mins.yes ISP 1 is accepting the two / 24 prefixes.

[Philip D'Ath]

When the failure happens can you access resources inside of ISP1?  I assume the answer will be yes,

Ask ISP1 to verify their their upstream is accepting your prefixes from ISP1.