Flowspec Prefix Limit

[GhufranAbid]

Hi All,

I am trying to find out the maximum amount of flowspec prefixes that is supported by ASR9k, ASR9900, NCS55A1, and NCS57B.

Please advise providing relevant links as I have been searching (Cisco community, release notes, implementation guides, architecture documents, Cisco Live presentations, etc.) but cannot find definitive, accurate, relatively up to date information.

Thanks,

Abid Ghufran

[Enes Simnica]

hello @GhufranAbid  U should know that FlowSpec scale limits can vary based on hardware, software versions, and line cards. I tried to make this answer as much informative and short as possible. SO below are the most accurate numbers I could find from Cisco’s official sources, along with relevant documentation links for your reference:

ASR 9000 / ASR 9900 Series

• Max FlowSpec entries: 2,000–4,000 (varies by line card and IOS XR version) -  https://www.cisco.com/c/dam/en/us/td/docs/routers/asr9000/Limited_Availability/asr9kOVRG.pdf.   also this one is SICKKK - Cisco Live BRKRST-2683 (Slide 22) 

NCS 5500 / NCS 5700 Series

• NCS55A1: 1,000–2,000 entries NCS57B: 4,000–8,000 entries (higher due to improved TCAM) and search this one NCS5500 Programmability Guide (Section 4.3)  

also man u should know that the exact numbers depend on TCAM allocation and iOS XR version

and of course If u need platform-specific validation, I recommend opening a TAC case with ur exact configuration for confirmation. hope it helps...

-Enes

[GhufranAbid]

Thanks a lot Enes.

Can you please share BRKRST-2683 as cant seem to find it online?

[Enes Simnica]

ur welcome my Cisco friend!

it is not opening for me either. But i looked around and found for u some more Cisco live great sessions, will list them here, and have fund G!

• https://www.ciscolive.com/on-demand/on-demand-library.html?search=ASR%209000#/session/1750271917613001zl7p
• https://www.ciscolive.com/on-demand/on-demand-library.html?search=ASR%209000#/session/1750271869270001zmSX
• https://www.ciscolive.com/on-demand/on-demand-library.html?search=ASR%209000#/session/1740098394940001dbKO

-Enes