ASR9000 BNG Introduction VOD

[@prakashdaga]

Super Cool Video. This is a great tool to use when we deliver BNG presentation to customer.

[@xthuijs]

The loopback for IPv4 is required in PPP providing an L3 endpoint on the BNG side of the p2p link. Used to start IPCP. The address can be anything (even private addressing) and a /32. In the case of IP sessions, the loopback needs to represent the default gateway that is used by the clients. In this case the mask needs to be smaller then 32. The clients DHCP obtained addresses need to be in the same subnet as this loopback.

[@cathyli3449]

Really cool BNG demo! Seeing is believing~

[@thisisyudh]

thank you very much for your explanation.

[@xthuijs]

You can go either way. You can apply a loopback via the template or via radius. Both subinterfaces can terminate subscribers being unnumbered to the same loopback or not, it really depends on your deployment model. But they can share the same loopbakc, it just extends your (dhcp/subscriber) subnet over multiple interfaces, that is ok! You may find this read interesting, google "asr9000 bng deployment guide"

[@thisisyudh]

wow really appreciate you super prompt response ! in this case i'm deploying an IPoE session which have a two segment of DHCP pool, on interface BE1.10 & BE1.100. so which segment that i have to put as a loopback segment and what is the ip of the loopback since you mention that it is represent as the def gw? should i put both (example) "ip unnumbered bundle-ether2.10" ?? or should i put another dynamic template so it can have different ip unnumbered loopback ??

[@thisisyudh]

what does ip unnumbered loopback12 used for on dynamic template configuration ?? what if i'm not using that particular configuration ?? thanks

[@thisisyudh]

hi Xander, another question to ask : I can't see option-82 information when i run sh dhcp ipv4 proxy binding detail. the value of insertedRemoteID & InsertedCircuitID = -. i also see that asr not insert it when i run debug dhcp command. i already configure : "relay information option relay information policy keep relay information option allow-untrusted" on dhcp profile and assigned it to appropriate interface. Any idea on this ??

[@javierhumphreys6167]

Awesome. ...X-men!! ;-)

[@cchance]

Xander, how does the 9k BNG differ from teh 1k BNG, is it just in the size/performance/customer amount they handle?

[@xthuijs]

hi chris, asr1k is based on the IOS-XE operating system, ASR9K uses IOS-XR. In IOS/XE the use of a control policy (aka ISG) is optional. in XR it is part of the subscriber implementation. ASR9K can run subscribers on the LC/CPU, allowing for massive scale. Each LC can carry today 64k subs, with 32k subs per NPU tops (note that most linecards have 2 or more NPU's, depending on which card you have). So the larger your chassis is in terms of more LC's, you can increase your scale significantly, currently tested up to 512k subs. The forwarding is all handled by the NPU which runs at 45 Mpps per direction. So depending on the interface load (that is how many 10G's per NPU which is card dependent) you have that number of pps to share over these interfaces. There is some more good stuff on this on the cisco support forums you may like. cheers xander

[@cchance]

xthuijs thanks for getting back to me so quick... All the guides seem to be based on the 9k.... We're looking to use ASR as a BNG... But not sure if we should go for 1k or 9k, i mean from what u've said they grow to way beyond what we'd need, i mean we're looking to start with ~2k subs for this bras deployment, scaling to maybe 10-15k, is a 9001 overkill for our number of DHCP Subs, (dualstack)

[@B0JIKA]

What do you use in this demo for RADIUS\CoA?

[@xander4713]

Since none of the tools did what I needed I wrote a customized COA tool some time ago that I have been maintaining and you can download via this reference: supportforums.cisco.com/document/64681/using-coa-change-authorization-access-and-bng-platforms cheers! xander