iBGP update-source loopback/next-hop-self
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03-18-2023 03:47 PM
I've a small confusing regarding the following configuration on iBGP router
update-source loopback
next-hop-self
If i'm configuring iBGP neighbor using loopback interfaces i would normally add the
command neighbor x.x.x.x update-source loopback 0 to specify the source address of the packets
Now when advertising an external route (from an eBGP neighbor) to an iBGP neighbor i need to configure
neighbor x.x.x.x next-hop-self.
i just want to know if the next-hop-self command means the exit interface on my iBGP router or the loopback address.
Thank you
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03-18-2023 04:07 PM
update-source loopback
this use between eBGP and also between iBGP
this in eBGP effect
A- the IP of BGP TCP packet between two peer to be use loopback
B- the next-hop of any prefix advertise will be this loopback
this in iBGP effect
the IP of BGP TCP packet between two peer to be use loopback
next-hop-self
this use only between iBGP
the next-hop of any fix advertise will be this loopback
it not effect the IP of BGP TCP packet between two peer
