Announce BGP route 0.0.0.0

4 replies
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Hi,

I'm trying to announce a default prefix from BGP. My goal is that all BGP traffic will flow to my datacenter Fortigate, unless the network is announced somewhere else. We're moving from Cisco to Fortigate... the command for Cisco was just 'network 0.0.0.0'. I tried the following, but got the returned error code:

FG (bgp) # config network

FG (network) # edit 1

FG (1) # set prefix 0.0.0.0/0 (I also tried /32 and 0.0.0.0)

The prefix 0.0.0.0/0 is not allowed

node_check_object fail! for prefix 0.0.0.0/0

What is the equivalent or how can I accomplish this for the Fortigate. Thanks.

lobstercreedAnswer

New Member

Yes, this should work fine, per this KB: https://kb.fortinet.com/kb/documentLink.do?externalID=FD40248

I think Toshi's point was assuming that you had a default route in your routing table to advertise. As per the above KB, the command you highlighted should work even when the advertising router doesn't have a default route.

Toshi_Esumi

SuperUser

If you're trying to pass the default route from an i/eBGP nighbor to another eBGP neighbor, it should be automatic without anything special. But if you want to advertise only the default route and omit all the other routes, one option is to create 1) a prefix-list for the default route, and 2) a route-map to allow the default route prefix only (denying the rest is implicit), then 3) refer it in the neighbor config with "set route-map-out" statement.

BubbabowskiAuthor

New Member

Thanks, I will give it a shot.

BubbabowskiAuthor

New Member

I made the change last night, but there was still no default route picked up by the remote branches. I found this earlier... is it this simple?

config router bgp set as 65002 set router-id 1.1.1.2 config neighbor edit "1.1.1.1" set capability-default-originate enable set remote-as 65001 set send-community6 disable next

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