[113253] in North American Network Operators' Group
Re: options for full routing table in 1 year?
daemon@ATHENA.MIT.EDU (Jared Mauch)
Thu Apr 9 11:33:47 2009
From: Jared Mauch <jared@puck.nether.net>
To: Jo Rhett <jrhett@netconsonance.com>
In-Reply-To: <1D70CF0F-3B90-4E60-AE4F-1A6E26972FA7@netconsonance.com>
Date: Thu, 9 Apr 2009 11:30:39 -0400
Cc: NANOG list <nanog@merit.edu>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Apr 9, 2009, at 11:17 AM, Jo Rhett wrote:
> On Apr 8, 2009, at 6:43 PM, Tim Durack wrote:
>>> Cisco 6500/7600 you replace SUP32 or SUP720 with SUP720-3BXL
>>> ...if I understand it, no other cards need replaced?
>>> (note that this disagrees with my understanding of how their
>>> FIB/CEF
>>> works so I'm curious about this)
>>
>> If you have linecard DFCs they would need to be XLs also.
>
>
> The DFCs are what make hardware forwarding possible, yeah?
> Upgrading the DFC requires a line-card swap, or just a DFC daughter-
> card?
DFCs allow hardware forwarding on the linecard. (Otherwise it's a
centralized lookup on the PFC.. if you do not exceed the PPS limits of
the PFC, you may not need a DFC for your environment).
It's the same EARL as is on the PFC. The system will use the lowest
rev PFC/DFC type and they must all be the same type major class. eg:
PFC2 series vs PFC3 series.. and it will follow the 3C[-XL] -> 3B[-XL]
-> 3A downrev path. If you have a sup720 w/ pfc3a the dfc-3bxl's will
lower themselves to 3a capabilities.
btw, this discussion is likely best suited for cisco-nsp.
- Jared
