[c-nsp] Next step-up from 7206VXR

Mack McBride mack.mcbride at viawest.com
Tue Feb 19 23:49:08 EST 2013

Sup720 handles the average churn fine.  Spikes in churn can be an issue, but for the average use they are fine.
The usual cause of spikes are full feed failures and re-convergence.
The RSP720 and Sup2T obviously have superior CPUs that can handle the spikes as well.

The 1 million routes is default 500k ipv4 and 250k ipv6.
Most providers have changed their setups to 640k ipv4 and 192k ipv6.
At some point service providers will stop allowing /24 de-aggregates when a shorter prefix exists.

All of the Sups and DFCs basically use the same FIB TCAM so no there is no difference in how they handle
the routes.  The only difference is between v4 and v6, 2 x v4 = 1 x v6.

There is a difference in the ACL TCAM but it mainly effects IPv6 ACLs.

LR Mack McBride
Network Architect

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Pete Lumbis
Sent: Tuesday, February 19, 2013 10:34 PM
To: Jon Lewis
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Next step-up from 7206VXR

There are two pieces: control plane processing power and TCAM.

Sup720 CPU can't really keep up with the average churn of the internet anymore. RSP720's and Sup2T CPUs can still keep up.

Both RSP720-3CXL and Sup2T-XL can support 1 million routes*

*hardware implementation is different on these cards and how v4/v6 routes are shared in hardware storage is not the same.

On Tue, Feb 19, 2013 at 11:39 PM, Jon Lewis <jlewis at lewis.org> wrote:

> The Sup720-3bxl (and Sup2T and RSP720) will run out of tcam before the 
> "churn of [a couple of] full feeds" makes them non-viable.
> We're getting close to a repeat of 2008, where lots of 6500s (those 
> still running Sup2s) were inching up against their maximum supported 
> routes when dealing with full views.  Sometime in the next year or so, 
> the default
> IPv4/IPv6 split on the best Sups you can get today are going run out 
> of
> IPv4 FIB TCAM.  Some will tune (or already have tuned) the split to 
> buy another year or so, others will do so only after some head 
> scratching when their 6500s fall over.
> The question is, will cisco release a bigger FIB TCAM sup for the 
> 6500, or will they allow this product line to end its useful life as a 
> full view internet router in order to push people into ASRs or competitors' products?
>  On Tue, 19 Feb 2013, Pete Lumbis wrote:
>  Both Sup2t and RSP720 (to a lesser extent but still much better than
>> Sup720) can handle the churn of full feeds.
>> On Tue, Feb 19, 2013 at 5:10 PM, Tony Varriale <tvarriale at comcast.net
>> >wrote:
>>  On 2/19/2013 2:57 PM, Jon Lewis wrote:
>>>  On Tue, 19 Feb 2013, Eric A Louie wrote:
>>>>  I've run out of port capacity on my 7206VXR and need to go to "the 
>>>> next
>>>>> router"
>>>>> or put in another 7206VXR side-by-side.
>>>>> Any recommendations on what to use if I were to replace my 
>>>>> existing 7206VXR with another chassis?  (it's limited to 5 GB 
>>>>> interfaces, and we need 7 or 8)
>>>> You've got to say more about what the router is doing and what you 
>>>> need from it.  If it's routing for 8 1gb ethernets and doing full 
>>>> BGP routes, and nothing special, then a 6500 is an attractive 
>>>> option bang for your buck-wise.  They're made for ethernet and 
>>>> comparitively cheap to keep adding ports to.
>>>>  Except when said 6500 sup CPU is asked to do BGP intensive stuff 
>>>> :)
>>> tv
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> ------------------------------**------------------------------**----------
>  Jon Lewis, MCP :)           |  I route
>  Senior Network Engineer     |  therefore you are
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