Max. no. of BGP prefixes supported in ASR9K Platform
FIB is shared between IPv4 and IPv6 and one IPv6 route occupies twice more size compare to IPv4.
For trident LC the limit is 1.3M and for Typhoon 4M (note, the limit is per LC and not per RSP)
Trident: IPv4 + 2*IPv6 <=1.3M
Typhoon: IPv4 + 2*IPv6 <=4M
For RPS memory it is challenging to say as it is linked to the amount of memory the paths are going to consume.
Each process in XR can allocate up to 4G of memory, in the worst case scenario ipv6 RIB and ipv4 RIB may want to allocate 4G of mem, then the TR is not good enough (6G) and you will want the SE version (12G).
Please note! As it was explained earlier, the number of routes limitation comes from LCs, not RSP!
You can use "show cef platform resource location " to find out max and currently used number of entries.
A memory usage on RSP is not linked to a number of prefixes, but to amount of attributes linked to those prefixes and number of features you run on the router. Amount of prefixes is just one of many things which contributes to the RSP mem usage.
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