Plz help on BGP, I am working for the ISP. I have Many Backbones, and few Block of Class C ( 195.X.X.X )IPs. Here i am advetising the each block to separate backbones throu rote-maps In BGP How can we split the one Block. For Ex: 195.X.X.0 255.255.255.240 has to come throu one Backbone and Remaining has to come with some other backbone. How this can be achive.
ip route 192.168.1.128 mask 255.255.255.128 Null0 250
ip route 192.168.1.0 mask 255.255.255.0 Null0 250
ip prefix-list 101 seq 5 deny 192.168.1.128/25
ip prefix-list 101 seq 10 permit 0.0.0.0/0 le 32
ip prefix-list 102 seq 5 deny 192.168.1.0/25
ip prefix-list 102 seq 10 permit 0.0.0.0/0 le 32
This would announce 192.168.1.0/25 to AS 65001 and 192.168.1.128/25 to AS 65002. Additionally both ASes get the full address block (plus all other routes) to ensure connectivity for the full address block if one neighbor goes down.
Be aware however, that in the internet it is highly unlikely to get updates announced smaller than /24. Most large ISPs will block anything smaller than /24.
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