it is a way (the old way) to advertise an aggregate address, the static to null0 allows to use under BGP a network command to advertise the prefix.
the modern way to do this is to use the aggregate-address command under BGP process
ip route 184.108.40.206 255.255.252.0 null0
router bgp myASN
network 220.127.116.11 mask 255.255.252.0
it is also used for stability instead of relying on component routes learned by an IGP like OSPF if the objective is to advertise a block of IP addresses the static to null0 allows to use the corresponding network command to advertise the aggregate
No, what I meant is that you might not have the Network advertised by BGP in the routing table as static or connected, so you might need to advertis them using Nul0 static into BGP. Now regarding the /22, this doesnt have to be , it could be any subnet redistributed into bgp without specifically saying /22.
1. Even if the IGP route is down, because of this null route, the traffic will reach this router(I read that null0 is having the least preference), so that trouble shooting also will be easier, right??
2. I think we can use null0 for privisioning also..right?
3. I clarrified with some of my collegue they are using /22 because there is a HUB router having 3 spokes, so they summerise the spokes with /22
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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