NeerVerma
asked on
BGP
This is to clarify few things regarding BGP
1- I have a block of APNIC IP (/24) and AS number .I am using this block at one of my location and BGP is configured. Since most of the IPs are unused so I want to Subnet this /24 block to /27 and want to use one of the subnet and AS no. in other location to configure BGP. Now I talked to few ISP and the told me that they require /24 to advertise BGP traffic and they deny to advertise /27 .So is it true that For BGP minimum requirement is /24
2-: One of The ISP has given me solution that they will do it by advertising /27 and /24 both .According to them in their internal network they will broadcast /27 and on public domain it will broadcast /24 in both location .Is it possible if yes then is there any disadvantage of that Since on public domain it will broadcast /24 Are we able to create site to site vpn to any office abroad with this senario
waiting for reply
1- I have a block of APNIC IP (/24) and AS number .I am using this block at one of my location and BGP is configured. Since most of the IPs are unused so I want to Subnet this /24 block to /27 and want to use one of the subnet and AS no. in other location to configure BGP. Now I talked to few ISP and the told me that they require /24 to advertise BGP traffic and they deny to advertise /27 .So is it true that For BGP minimum requirement is /24
2-: One of The ISP has given me solution that they will do it by advertising /27 and /24 both .According to them in their internal network they will broadcast /27 and on public domain it will broadcast /24 in both location .Is it possible if yes then is there any disadvantage of that Since on public domain it will broadcast /24 Are we able to create site to site vpn to any office abroad with this senario
waiting for reply
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For those ISPs that filter based upon the size of the routing table, /24 is a common lower figure although I have accepted up to /28s.
I would recommend (for example and if you have enough bandwidth at both locations), to announce the /24 and the /27. Using OSPF through a GRE tunnel you can route traffic to the other location, if need be.