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Forum Discussion
Limited number of IPv6 NDP entries
When I configure SDM to use dual-stack (IPv4 and IPv6), I do expect to use both.
However, at least with firmware 11.0.0.31, I get this limits:
(switchcore) #show sdm prefer The curren...
Hi luizluca,
Welcome to the community!
The maximum ARP/NDP counters is depended on different SDM template.
Login the switch by GUI(HTTP/HTTPS), go to 'System'-->'Management'-->'SDM Template Preference', you will see:
1. 'IPv4 Data Center Plus with IP Multicast Support': the 'ARP Entries' is 6144, and the 'IPv6 NDP Entries' is 0;
2. 'IPv4 Data Center Plus without IP Multicast Support': the 'ARP Entries' is 6144, and the 'IPv6 NDP Entries' is 0;
3. 'Dual IPv4 and IPv6 Data Center Plus with IP Multicast Support': the 'ARP Entries' is 4096, and the 'IPv6 NDP Entries' is 1024;
4. 'Dual IPv4 and IPv6 Data Center Plus without IP Multicast Support': the 'ARP Entries' is 4096, and the 'IPv6 NDP Entries' is 1024;
That's mean: if chose dual v4/v6 SDM template, the maximum 'ARP/NDP' counter is 5120; if chose only v4 SDM template, the maximum 'ARP/NDP' counter is 6144;
Hope it helps!
Regards,
EricZ
NETGEAR employee
Retired_Member, thanks for your answer. However, I'm still confuse. You mentinoned "maximum 'ARP/NDP' counter is 5120;" but table shows ARP as "4096" and NPD as "1024". You say that they share a common limit of 5120 (4096+1024)? Aren't they independently managed or NPD can borrow entries from ARP?
No, not share the table size. Just independent for v4 and v6, 4096 ARP table and 1024 NDP table.
Sorry Retired_Member, but I my questions are still open:
What will happen when "IPv6 NDP Entries" is exausted?
Now I have 4096 (ARP) and 1024 (NDP) entries while specs says I have "6K ARP/NDP". Are specs wrongs? Have it changed without metioning in firmware changelogs?
Hi luizluca,
It's just different understanding. Actually, SPEC describe the maximum 6k APR/NDP entries, just meaning supported in specific SDM template. It's not meaning will support total 6K ARP/NDP entries in every SDM template.
Hope it can helps!
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