michael brooks - ESC via NANOG wrote on 29/08/2025 20:42:
I have been watching the "Weekly Global IPv4 Routing Table Report" for a
while now, and have been itching to see the *BGP routing table entries
examined line* hit 1M. Now, perhaps I am naive, I am assuming that line
correlates to the actual number of routing table entries, true?
Am I the only one a bit excited to see this? Is this a non-event?
not a non-event. There's almost certainly kit still in deployment which
has forwarding table capacity to handle 2^20 = 1048576 entries.
Typically once you exceed these limits on a hardware platform, you lose
synchronisation between rib and fib, and end up with non-deterministic
routing / unexpected blackholing. Add in even a medium sized internal
routing table and a bunch of l3vpns, and the limit will be reached even
sooner on these platforms. So yeah, this will be an issue for some
operators.
Nick
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