Cisco LNS Router for 128K users

[Rami Ibrahim]

Hi All, 

 We have a requirement to purchase two cisco routers to behave as LNS for DSL users, the requirement is to support 100G Interfaces and 128K users (PPPoE sessions) per router + per-sessions QoS.

 I am thinking of ASR 9K but I cannot find any relevant documentation that state the scaling limit of ASR 9K. 

 Any help.

Best regards,

[Enes Simnica]

gDay @Rami Ibrahim and YES, ASR 9K can definitely handle that, cause it’s built for large-scale LNS use cases.
U’ll want to check the ASR 9000 System Scalability Guide, which lists PPPoE session and QoS limits for each line card.

check the link G and have fun!: https://www.cisco.com/c/en/us/td/docs/iosxr/asr9000/general-administration/configuration/b-general-administration-configuration-ios-xr-asr9000/scale-profiles-and-feature-profiles.html

hope it helps!

-Enes

[Rami Ibrahim]

Thank you enes, but I am not being able to locate the info in the link you shared. they posted the limit of L2/L3 features.

[Enes Simnica]

also @Rami Ibrahim i found this : The maximum number of subscriber sessions per ASR 9000 line card (LC) is 64,000. With multiple line cards, the total number of sessions increases linearly — for example, two line cards can support up to 128,000 sessions in total. 

check this link to see if it helps: https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/25xx/bng/configuration/guide/b-bng-cg-asr9000-25xx/establishing-subscriber-sessions.html#concept_CABF81ED46BF4D4C9AF376B533ED203A

and let me know if i didnt understand what u are looking 100%..... PING ME..

[M02@rt37]

Hello @Rami Ibrahim 

Please see that thread: https://community.cisco.com/t5/service-providers-knowledge-base/bng-deployment-scale-guidelines-on-asr9000/ta-p/3156300/page/3

[Rami Ibrahim]

Hello  M02@rt37

 Thanks for your reply. I've read the document and my understanding is that In case I selected ASR 9901 which is fixed router without a room for Line Cards, the BNG functionality will happens on the RSP (RP based Subscribers) and with a total scale limit of 128K sessions. is that right? 

Can you please also confirm the 9901 support BNG (LNS Side)? I've found article saying it supports only (LAC side)

Best regards,,

[M02@rt37]

Ok @Rami Ibrahim 

THe documentation does not clearly confirm support for full LNS subscriber termination at high scale on that chassis...so I suggest contact TAC support for clear explanation/validation.

[Rami Ibrahim]

Ok thank you

[ChristopheLucas]

Hi,

Be careful. ASR9K is able to be BNG for PPPoE subscriber, but is not able to be a PPPoVPNDN subscriber server (aka LNS in L2TP technology). 

It waill probably a better choice to go to C8500 series router.

Regars,